Throttle Body Stuck Open Symptoms


If cleaning the throttle body, be sure to remove the TPS, and also try to avoid getting engine cleaner and water on the TPS, its not totally sealed. Other possibilities include a dirty throttle body, vacuum leak, incorrect ignition timing (retarded), bad gas (water or other contamination), an A/C compressor that is dragging, or an EVAP purge valve that is stuck open and is flooding the engine with fuel vapor. You'll probably have to remove a bolt and disassemble the lever assembly near the handle to get the cable out. Goodyear's advice was to call the closest Ford dealership since this was a very unual mode of failure for a car so new, and they thought there probably was a related factory service bulletin or recall. Solution: The most likely problem is the shock absorber top mounts. Repair the vacuum hoses as necessary. There are a few signs that could be a signal that the throttle position sensor is failing. sometime you will need a whole bottle. 3 million vehicles on the road and on dealers' lots, we've compiled the following list of. Whenever I come to a stop and press the accelerator it is slow to accelerate. Idle air control valves open to allow more air to "leak" into the intake, raising the engine rpms, or close when not needed. Carbon deposits can build up causing poor throttle response and lower fuel mileage. You didn't say what year truck you have but I'm assuming its a '99 or newer "New-Body-Style",If it is GM has come out with a bulletin to clean the throttle body and plug the hole in the middle of the thottle blade and then adjust the TPS to "open" the blade up a little to prevent it from sticking. 1s, that the ground for the throttle body that is in the wiring harness was insufficient for the drive by wire needs and adding a ground strap helps. Does anyone have any experience of a Throttle Position Sensor (TPS) failing?I had the 60000 mile service done on my RAV4. Shine a flashlight if possible into the part to examine the carbon buildup on the inner body. Pull the unit off and disconnect the electronic sensor from the car wiring. Two other times at a stop, the idle wouldn't come back down from about 2200 rpms. Re: 2004 chevy trailblzr-throttle position sensor replace They are both together in one part so you don't have a choice. The TPS connects to the throttle plate on the throttle body. Distributor vacuum adv/ret cell 8. The Throttle Actuator Control (TAC) system uses 2 Throttle Position (TPS) sensors to monitor the throttle position. Only use a throttle body specific cleaner as it won’t damage any components associated with your throttle body or intake. Just hold onto that little straw to keep it from flying into your engine!. By Ross Kuhre (Stock 93 MX-5, C package, 130k mi). How to Fix. If an EGR valve is stuck open, it creates a vacuum leak, with the only difference that instead of air, it's the exhaust gases that enter the intake manifold. proportional to the throttle plate/shaft angular position. This tutorial addresses a very common problem I've seen on the 1987-1995 GM 4. Transmission Won’t Downshift – If the transmission will not downshift, one of the shift solenoids may have become stuck open / closed, preventing fluid from entering the transmission valve body to pressurize the correct gear. Note the locations of the accelerator and decelerator cables prior to removing them. Some of the causes of a bad throttle body include a bad ground, an open circuit, possibly too much resistance in the circuit, or even a loose connection. I have a 2011 Milan 6cyl with 38k miles. For instance, a PCV valve that sticks open may cause a check engine light. I was accelerating hard from perhaps 35 mph and when I took my foot off the pedal around 40 or 45 the car kept accelerating. This below should help if you havent already found it. I just post a question about my car idling problems come to find out my throttle body is stuck in the open position. Among other things it helps the engine maintain a stable idle speed. Allow it to soak in for a moment, then using a clean rag, wipe out the build up. EEC-V monitors are designed to measure potentiometer that provides a voltage signal to thethe ability of systems and components to maintain Powertrain Control Module (PCM) that is linearlylow emission levels. 7L engines with throttle body fuel injection system: a stuck open EGR valve. Note the locations of the accelerator and decelerator cables prior to removing them. Undo the Torx screws on the top of the cluster and pull the unit free of the throttle body. Plug the line going from the solenoid to the throttle body, and see if your problem goes away. Solution: The most likely problem is the shock absorber top mounts. Open loop is only used during cold start and very heavy load (as in WOT). There are dozens of various passages and channels within the valve body which direct the flow of pressurized hydraulic fluid to different valves in order to activate the right clutch pack or band and shift to the most appropriate gear based on the. Check that the throttle flap is not stuck open. If your lawn mower's throttle cable is hard to move or stuck, here's a fix. Auxiliary air regulator (stuck open or leaky) 9. There are 2 designs for the TAC, parallel and inline. To help you prevent further intake system failure, here are a few common symptoms of a faulty throttle body. The Throttle Position Sensor (TPS) is a potentiometer attached to the throttle body which notifies the ECU about the position of the throttle. GM W-Body ECM Trouble Codes What do you do when this dreaded light turns on? In every GM W-Body car, there is a computer that controls virtually all aspects of the engine's operation. If you encounter these symptoms and your Volkswagen throttle body is the culprit, a new OEM throttle body will fix the problem and get you back on the road. Transmission Won’t Downshift – If the transmission will not downshift, one of the shift solenoids may have become stuck open / closed, preventing fluid from entering the transmission valve body to pressurize the correct gear. These are the most common symptoms of a dirty electronic throttle body: Sticky gas pedal sensation felt as a hesitation when you accelerate the engine. I just post a question about my car idling problems come to find out my throttle body is stuck in the open position. Next morning I Checked the cable, it moves freely. 7L engines with throttle body fuel injection system: a stuck open EGR valve. Other throttle body problems can include faulty Idle Air Control (IAC) valves or Manifold Absolute Pressure (MAP) sensors. Here are the Motorcraft SP-520 3. i had the same issue , i replaced the maf and that fixed the idle dropping , but the little hesitation when feathering the gas is still there , and sumtimes the car cuts out mid gear on its own around 1800 rpm , i was told my throttle body needed replacing , my tps is fine and just as u said repositioning my throttle didnt work for me either , tell me wat works for you cause im litterally on. The next step was to try and identify the meaning of this very unusual DTC. When you open or "twist" the throttle and release, it should be smooth and snap back "closed" without any hesitation. Does the throttle return stop contact lever arm? HU5 CHECK FOR THROTTLE BODY STICKING, BINDING, GRABBING Gently cycle throttle from open to closed position several times. Ford reports that the symptoms show as an idle speed that drops below the recommended speed or the vehicle exhibits a fluctuating idle. > ETB wiring and connector: perform a meticulous visual inspection of the Electronic Throttle Body wiring and connectors. Throttle Position Actuator (V60) faulty/jammed (Stuck Open) Wiring/Connectors from/to Throttle Position Actuator (V60) faulty; Possible Solutions. Look under the fault codes section under Engine > Engine Management > Trionic OBDII. If your lawn mower's throttle cable is hard to move or stuck, here's a fix. You would definitely know if an injector was stuck open. If it is bad I would disconnect the battery and not turn the key on until it's fixed. Research the 2006 Ford Mustang at cars. 7L engines with throttle body fuel injection system: a stuck open EGR valve. so my guess would be throttle cable first, then maybe gas pedal stuck? idk random thought but stranger things have. I didn't want to move the valve as it is electrical gear operated. It's been an even longer road for owners with ETBs that are prone to sudden surges, dangerous stalls, and being sent into 'limp home mode' which is like driving a snail through a molasses puddle. Kimby, the first problem matches the throttle position sensor symptoms very well. Idle air control valves open to allow more air to "leak" into the intake, raising the engine rpms, or close when not needed. Throttle Body Assembly Any ideas on how to fix my throttle by wire issues on a 10 Street Glide? When you turn the key and hit the run position it goes click click click real loud, now the C. Typical automotive voltage range is 12. When open, the IAC allows more air to enter the engine, which raises the idle. The throttle body is solely responsible for the proper idle. Often it comes loose and works it's way out binding on the TB parts. Intercooler to manifold hose is a solid pipe with a straight coupler on one end and an elbow at the throttle body, also no cracks in any of those. any help would greatly be appreciated. The air flow is an open one, without any restrictions, and the RPM is varied only by the injected fuel quantity. Using the installation tool from the service kit, apply some bearing grease to the tip of the tool to help hold the plug on the tool, then push the plug into the orifice until it bottoms out at the throttle plate. ) and after I put it back together I noticed something strange. The valve remains in the normally closed position when the engine started, at idle and at wide open throttle. Check first for possible pending trouble codes, just in case. Shine a flashlight if possible into the part to examine the carbon buildup on the inner body. also, my idle seems to hang at times. I drove about 30 miles (some dirt / and some highway roads) to my camp with the light blinking and the jeep ran as normal. Truck info: 88 f150 4wd 4sp 300 / inline 6 cyl. Cleaning might help for the "stuck closed" issue but not with a hard code set. I Decided to open up the plastic cover on the throttle body to inspect the servo and gears, to see if something was visibly damaged, and I found that right over the axle which moves the throttle plate, there is a small chip. Symptoms of a Bad or Failing Throttle Body 1. In extreme cases, the deposits can become so built up that the throttle body plate will become stuck, striping out. The throttle body can be cleaned one of two ways, either by simply spraying a throttle body cleaner into the throttle body while the engine is running, or for a more thorough job by removing the throttle body assembly and cleaning the parts manually. The Throttle Position Sensor (TPS) is a rotary issues. Remove, clean, and replace the EGR valve, reseat the injectors and put the bolts back in. Helps stopping the engine more effectively on shutdown by blocking the intake air. The TP sensors 1 and 2 are located within the throttle body assembly. The throttle position sensors contain electro-mechanical moving parts which are prone to wear and tear, which eventually add to the cost of car repairs. I recently did some work on my throttle body (had it removed, cleaned all the valves, etc. The symptoms include stalling when coming to a stop, or very low idle after starting, or stalling if the throttle is "blipped" (opened and closed quickly). Ford throttle body problems have caused Ford owners to file a proposed class-action lawsuit alleging the Delphi Gen 6 electronic throttle bodies cause the vehicles to enter "limp-home" mode. Solution: The most likely problem is the shock absorber top mounts. Throttle Stuck (Almost) Closed At Throttle Body I took my sled out from storage and my throttle won't go to the bar; it will pull out an inch or two of cable, but then stop. If the idle rpm decreases then the AAR is not closing. i dont think an acorn is part of the motor. Plugged unit into a ODBC II and the Throttle Position sensor is stuck at 95%. On some other cars it is possible to reset it using the following method. Open loop is only used during cold start and very heavy load (as in WOT). The IAC valve allows the computer to control idle speed, by bleeding small amounts of air into the intake. I drove it home and took it out a few days later on a short trip, floored the accelerator on a clear patch of road, and found the power. How a Transmission Valve Body Works. If your engine harness was bad then your throttle body electronic cable is likely bad also. Page 1 of 3: How to Test the Throttle Position Sensor (4. Learn what does P2111 Ford Throttle Actuator Control System - Stuck Open means, location and how to repair? The electronic Throttle Actuator Control (TAC) is a DC motor controlled by the Powertrain Control Module (PCM). There's been a few posts about cleaning the throttle body recently, and as I'd been experiencing similar symptoms (unsteady idling, hesitancy, jerkiness) I thought I'd give it a shot. The PCM controls the Throttle Actuator Control System by monitoring one or more throttle position sensors. The 2005 Ford Five Hundred has 22 problems reported for throttle body malfunction. So, my theory is that the throttle plate (or butterfly valve?) in my throttle body is sticking, especially when the engine is hot and especially on hot days (it was 80 degrees out today). It is very important to use 'Throttle Body Cleaner' and not carburetor cleaner to perform this cleaning. And when the EGR valve gets stuck open, it'll cause a rough idle condition that may hard to diagnose. The throttle actuator is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve using gears. A stuck FIAV would not cause a raised idle by simply coasting in neutral, idle would be raised whether coasting or standing still. as for a timing wire I know of a EST wire, that's the one you unplug to set the timing then plug it back in. Loosen the locking. When open, the IAC allows more air to enter the engine, which raises the idle. So, if you notice such symptoms, take the car directly to a mechanic. The Throttle Body is a device located in the engine compartment, between the intake manifold and air intake pipe. Stops the engine in case of diesel oil runaway. A malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. When there are throttle body malfunctions the wrong amount of air enters into the engine causing problems with air/fuel mixture ratio. It would be much easier if the posters of such questions noted the make, model, engine, year, and mileage of the car they are asking about. How to Know When Your Throttle Body Needs to Be Cleaned by Daniel Dick In most modern vehicles some of the exhaust is routed back into the engine through the throttle body, part of the air intake system. Follow the large hose from the air filter case until you reach the. Throttle body shaft (worn body or shaft) 7. Now what to do. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. You'd be fouling spark plugs like no tomorrow, I would imagine. Note: Be very careful not to let the thin, plastic spray nozzle (or anything else!) fall into the throttle-body opening. Unsteady idle. The choke butterfly should be fully open, as the engine is warm. Grime Buildup. When the throttle gets stuck in an open position than your vehicle will receive too much air and cause it to have a high or fluctuating idle. This WheelZine article tries to list down the possible signs and symptoms of a bad idle air control valve. Look for burnt, damaged, corroded or deteriorated wires, also unplug the actuator and look for bent terminal pins, loosely connections, corrosion or any other possible indication of a bad connection. how do i fix intake control runner valve stuck open on bank 1 9 Answers. The vehicle may or may not store the following trouble codes: P2111 Throttle Actuator Control (TAC) System Stuck Open. Poor gas mileage is the result of the vehicle's ECU, or computer, attempting to adjust the fuel mixture to compensate for throttle plates that are incapable of closing properly. I’m stranded again. A faulty Thermostat can be diagnosed by 2 very distinct issues. Reconnect air inlet tube(s). The engine has a major vacuum leak. i have a 2004 zx3 focus with a 2. The throttle body monitors the amount of air that can flow into an engine's combustion chamber. Every once in a while, after the car has been stopped for a minute (so when leaving the garage or after waiting at a red light, etc. REPAIR as necessary. If you have an idle problem with the unmodified NA 1. The TP sensors 1 and 2 are located within the throttle body assembly. Situation: stored outside, unused for approximately 1 year - upon return and restarting (it fired right up) the throttle sticks on however far you press pedal. Question: "What'wrong when your gas pedal is hard to push down?" OK. if i blip the throttle, it will go back down to idle. Im assuming this is a positional sensor. How to stop your car when the throttle is stuck Open in new window now is a good time to review the fundamentals of operating cars so that drivers are prepared in the event of a stuck. Cruise control systems, too, were connected via cable to the throttle body, controlling engine speed with an electronic or vacuum motor. The multimeter should show an increasing voltage as you (or your helper) open up the throttle. If it is stuck open the amount of turbo boost will probably be quite small, causing a reduction in power and probably fuel economy. Kimby, the first problem matches the throttle position sensor symptoms very well. As a result, it usually leads to poor fuel efficiency. Open the throttle plate by operating the linkage or having an assistant push on the gas pedal and spray the cleaner into the throat. Still same story with 4th gear. I can only give you an educated guess at your starting problem. The choke butterfly should be fully open, as the engine is warm. I'm woefully ignorant on how carbs and tbi's work (get the theory, no idea on the specifics). Remove, clean, and replace the EGR valve, reseat the injectors and put the bolts back in. One of the cables may be holding the throttle open. The most common symptoms of a bad exhaust gas recirculation valve are: Check Engine Light (CEL) on: due to its crucial role in emissions control expect the Check engine light to come on after driving for a while with a damaged EGR valve. Problem: Knock from rear suspension on rough road surfaces. When re-installing the TPS, one handy tip is to replace the stock screws with allen head screws, the you can use a ball-headed wrench to access the screws while the throttle body is in place. REPLACE throttle body assembly. This will often cause the revs to cycle between about 800 and 1800 rpm. It's been a long road for electronic throttle body (ETB) complaints in Ford and Mercury vehicles. It is very important to use 'Throttle Body Cleaner' and not carburetor cleaner to perform this cleaning. A reader emailed me about this and says if the throttle box is on loosely, it may work its way off and your throttle can get stuck in the open position while driving. Symptoms of a bad throttle in a car include a sticking gas pedal, a rough idle, a low idle or hesitation. On my '92 Dodge the IAC was stuck in the open position and it caused it to idle about 800 RPM's too high. Here are the Symptoms of a Bad Throttle Position Sensor One of the more frequent problems with modern vehicles is a bad throttle position sensor (TPS). The butterfly valve then closes when you take your foot off the pedal. If there is a boost issue it will in some cases go into limp. Note: Be very careful not to let the thin, plastic spray nozzle (or anything else!) fall into the throttle-body opening. A thermostat that is stuck open will not allow the engine to come to the correct operating temperature. Before I go do a bunch of testing or replacing I'd certainly inspect the throttle plate to see if a ring of carbon or ice or. The code signifies that the throttle actuator valve is stuck in the closed position or is slow to respond, and therefore your throttle may be slow to respond or not opening. The throttle is either binding, slow to respond, completely stuck or has failed. when i'm cruising at 2k, for example, and let off the gas and put it in neutral, the rpms will hang around 2k. Kimby, the first problem matches the throttle position sensor symptoms very well. Its definitely worth checking the condition of the throttle body as was previously stated and open the throttle plate to clean any build-up around it. Replaced all parts, cleared all codes and test. Using the installation tool from the service kit, apply some bearing grease to the tip of the tool to help hold the plug on the tool, then push the plug into the orifice until it bottoms out at the throttle plate. I have a 2006 Saab 9-3. It's been a long road for electronic throttle body (ETB) complaints in Ford and Mercury vehicles. The throttle position sensor, shift lever, and throttle valve cable are critical to proper operation of the transmission. 8L engine - having problems with the idle, acceleration, power ,etc. On my hand, the blade always got stuck because of a dirty throttle body blade. Next morning I Checked the cable, it moves freely. Repair the vacuum hoses as necessary. When your AC compressor kicks in or power steering is activated as you suddenly turn the steering wheel, the sudden drag on the drive belt will bog down the engine. It works about the same way as a toilet tank float valve. Replied by ShopTech on topic Frozen/stuck throttle butterfly! Possibly, take it out and see if the butterfly unlocks. This is when you have "the pedal to the metal," or the throttle is fully open. Reconnect air inlet tube(s). Guess #2; some ECUs have logic in them based on the speed sensor in the gearbox. The throttle is either binding, slow to respond, completely stuck or has failed. For instance, a PCV valve that sticks open may cause a check engine light. EGR valves can malfunction by becoming stuck open or closed due to carbon buildup. Chevrolet Captiva 2008 2. Positive Crankcase Understanding History of the PCV - Positive Crankcase Ventilation valve: Before the 1960s car engines were vented to the atmosphere. You will have reach from the firewall side to access clamp with screwdriver. * Throttle cable or cruise control cable. A competition style throttle body operates in the same manner as stock throttle bodies and installs generally in the exact same way. 7% to a high of 127%. Knowing the signs of a bad throttle position sensor will help in quickly diagnosing the issue and making the required amendments in time. Then use throttle body cleaner and clean the hell out of it like malibutommy said. It would be much easier if the posters of such questions noted the make, model, engine, year, and mileage of the car they are asking about. Poor gas mileage is the result of the vehicle's ECU, or computer, attempting to adjust the fuel mixture to compensate for throttle plates that are incapable of closing properly. I have searched the internet for this but I cant seam to find much information about this, Basically I am just wondering if the sensor is in the pedal or the throttle body. Code P2111 is set by the PCM when the throttle body plate is stuck in the open position. This idle will be high enough to "limp home" at 30-40 MPH, but obviously can't be driven much before repair. Should I reset adaptation values on my throttle body (MDK)? So I just finished a marathon work session on my '99 528iT over the holiday. Know that when you take it out when you put it back in youll have to take it to a shop and have them do a TPS relearn procedure with a scanner. A faulty Thermostat can be diagnosed by 2 very distinct issues. If you notice that your car will suddenly speed up even without adding pressure on the gas pedal, then a faulty throttle position sensor is usually the culprit. The underlying cause is often a vacuum leak in the intake manifold or behind the throttle body that allows unmetered air to bypass the airflow sensor. Just open the TB's by hand and watch next to them. also, my idle seems to hang at times. any help would greatly be appreciated. Incorrect air flow can result in poor engine performance, reduced power, poor idling and other problems. Throttle Position stuck at 95% Got no hardly power when I press on the accelerator and shooting out black smoke. I then cleaned the throttle body myself and cleaned the the IAC Valve too, with carb cleaner spray. I didn't do anything about it (yes kept using!), the car drank a lot of fuel but after a couple of weeks usage, the ECU readjusted maybe, and the RPM came down to about 800. Symptoms of a Bad or Failing Variable Valve Timing Solenoid 1. The throttle body is bolted in the front of the egr. When closed, it decreases airflow and lowers the idle speed. Look under the fault codes section under Engine > Engine Management > Trionic OBDII. Reconnect air inlet tube(s). Throttle sticking open - we are now sure that the throttle cable must at least be somewhat responsible. Among other things it helps the engine maintain a stable idle speed. Plugged unit into a ODBC II and the Throttle Position sensor is stuck at 95%. Now to gain access to the throttle body romove the trim at the rear of the bonnet opening, the first part of trim to remove is the water proof sealing, this simply pulls off. I can only give you an educated guess at your starting problem. Hyundai throttle body cleaning may be indicated if you have the following symptoms: No start (due to throttle valve stuck closed or air flow signifcantly restricted) Rough idle or fluctuating engine speed at idle (due to air flow restricted). The top of the pipe is connected to the throttle body. The intake is actually two separate loops folded over itself, which is why the throttle body is positioned at the bottom. The throttle position sensor provides feedback to the ECM to control the throttle actuator and set the throttle valve angle in response to driver inputs. Between the throttle body and the IACV you can expect to go through a pint or so of carburetor cleaner spray no kidding!. Situation: stored outside, unused for approximately 1 year - upon return and restarting (it fired right up) the throttle sticks on however far you press pedal. Repair the vacuum hoses as necessary. (The throttle cable moves freely btw) Yesterday (after it got below 20) I go out to start it and when I hit the accelerator it is sticky again. As you know, this part is the heart of your electronic throttle control (ETC). The butterfly valve then closes when you take your foot off the pedal. This procedure details how to perform a Throttle Body Alignment (TBA) on many VW/Audi vehicles. It will need to be kept open in order for proper cleaning. 12 Burn-off control for mass air sensor with hot-wire, open or short circuit. The MPx throttle body also features a design that allows you to change the throttle pedal feel from medium to super firm feel by means of switching the location of the throttle spring. If your engine harness was bad then your throttle body electronic cable is likely bad also. I then cleaned the throttle body myself and cleaned the the IAC Valve too, with carb cleaner spray. COMPUTER CONTROLLED THROTTLE BODY LIMP HOME MODE. There are dozens of various passages and channels within the valve body which direct the flow of pressurized hydraulic fluid to different valves in order to activate the right clutch pack or band and shift to the most appropriate gear based on the. I sprayed carb cleaner and some break cleaner into the throttle body to wash out the sanding residue. When you open or "twist" the throttle and release, it should be smooth and snap back "closed" without any hesitation. This procedure details how to perform a Throttle Body Alignment (TBA) on many VW/Audi vehicles. Once the throttle body is exposed, spray the throttle-body cleaner inside the air duct, and use the brushes to gently dislodge the dirt, gum and varnish that are present. Ford Fiesta & Fusion upto 2003 1. Then, they check for fuel pressure. I made the air box airtight, left everything in place but bolted the old throttle linkage open, stuck a 60mm single throttle body on the end of the air box, with an adaptor I made myself, and a K&N, and wired it up to the throttle cable. 9 Starter signal (circuit 50) missing, open or short circuit. And when the EGR valve gets stuck open, it'll cause a rough idle condition that may hard to diagnose. The transmission itself, except for the valve body and speed sensor, is virtually the same as a full hydraulically controlled. Faulty Throttle Actuator Control (TAC) Motor. Auxiliary air regulator (stuck open or leaky) 9. Apparently the throttle body for "fly by wire" cars can become lazy and not open fully. Faulty Powertrain Control Module (PCM). Faulty Manifold Pressure Sensor Symptoms: Detect Bad Map Sensor Symptoms The symptoms of a failing manifold pressure sensor are similar to the problems of low compression or improper fuel injection. Keeping your throttle body clean is a good way to maintain or improve fuel economy. Knowing the symptoms of a defective throttle position sensor can help you quickly diagnose the problem and make needed corrections. If you don't get the valve replaced immediately, your car will become undriveable. Reconnect air inlet tube(s). While moving, based on speed, the ECU may keep the throttle slightly open to prevent a coast stall. If the EGR valve is dirty, clogged, leaking, or is on the verge of failing, you can expect these symptoms to occur: If the EGR valve is stuck open due to an overflowing amount of carbon deposits, you will experience engine misfiring, poor idling, and engine stalling, which are all commonly manifested when the engine is cold. Failure of the Throttle Actuator Control (TAC) motor drive gears. 3 million vehicles on the road and on dealers' lots, we've compiled the following list of. The most common symptoms of a clogged BPC valve are jerks during acceleration on wide open throttle. With the throttle fully open, check the throttle cable stopper at the boot end and ensure that there is no more than one millimeter between the end of the stopper and the end of the boot. The throttle body is bolted in the front of the egr. · There is carbon buildup on the throttle blade or throttle body bore · The throttle stop screw is adjusted incorrectly (throttle resting closed too much) · There is a mechanical problem with the engine resulting in lower than expected vacuum levels at idle (this will require the IAC to open further so the engine gets the required amount of. The vehicle may or may not store the following trouble codes: P2111 Throttle Actuator Control (TAC) System Stuck Open. A malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. An injector that is stuck open or partially closed will emit an unburnt fuel odor in the engine compartment. Often, problems with an EGR valve that is stuck open are more noticeably after driving on the highway. if i blip the throttle, it will go back down to idle. As a result, it usually leads to poor fuel efficiency. Symptoms of a Bad or Failing Throttle Controller to a cable that ran from the pedal to the engine and was connected to a mechanical linkage mounted to a carburetor or throttle body. Follow the vac line from the egr valve, you should find it. Faulty throttle body position sensors can lead to stalling, rough idle, poor performance, and fuel economy. Electronic Control Transmission (ECT) The Electronic Control Transmission is an automatic transmission which uses modern electronic control technologies to control the transmission. They want to pull the valve body and find and fix the offending valve. The throttle position sensors contain electro-mechanical moving parts which are prone to wear and tear, which eventually add to the cost of car repairs. Clean it and put it back together and leave the hood open put the key in the auxilary position do not start. Do I need a new throttle body? Does a tech need to do something to recalibrate the computer? Did I do something to upset the wiring or a connector near the trottle body? I appreciate any ideas. The throttle body controls the amount of air entering the engine; more air means more power, less air means less power. nested in the cavity between the TPS and the aluminium throttle body. Does the throttle body rotate freely without a sticking, binding or grabbing condition? Yes No INSPECT cable(s). So they concluded is must be in the transmission not something on the outside like the throttle pressure governer or whatnot. Throttle body components, 4. Verify that the throttle return stop is in contact with the throttle linkage lever arm when the throttle is in the closed plate (idle) position. Pay attention to low idle or stalling. NOTE: Vacuum leaks, a faulty BCCD valve, stuck accelerator linkage, weak throttle body return spring or gummed open throttle body flap can also cause a fast idle. I sprayed carb cleaner and some break cleaner into the throttle body to wash out the sanding residue. P2111 2012 FORD FUSION Meaning The electronic Throttle Actuator Control (TAC) is a DC motor controlled by the Powertrain Control Module (). This permits the maximum flow of air through the engine, flushing the overly rich fuel mixture out of the exhaust. proportional to the throttle plate/shaft angular position. 8v, woulld not be unusual. Grime Buildup. Plug the line going from the solenoid to the throttle body, and see if your problem goes away. adjust idle speed to approx. Most injected cars will run without either the MAF or the TPS. If i slow down to under 10-15 mph, and the jeep falls into an idle, the throttle position guage will drop to about 6. When there are throttle body malfunctions the wrong amount of air enters into the engine causing problems with air/fuel mixture ratio. Ford reports that the symptoms show as an idle speed that drops below the recommended speed or the vehicle exhibits a fluctuating idle. Wide-Open Throttle (WOT) Once your normal driving is fine-tuned, giving BLMs of near 128 (126-130) (or wide-band AFRs very close to what your Open Loop AFR table is targeting), with no knock retard, you can move on to tuning the power portion of your PCM tune. One of the most common symptoms of a bad throttle body, or throttle position sensor, according to Reference, is when the car either hesitates to accelerate or stumbles during acceleration. All automatic transmission systems have a valve body which serves as the "brain" of the transmission. Shut off the engine. To clean remove the black magnetic actuator which will reveal the shaft. It was cycling open and shut very fast and continuously. FiTech Fuel Injection, USA info@fitechefi. Any stickiness should be addressed prior to a day of riding. Throttle body butterfly valve plate is stuck in closed position I removed my throttle body to port match it to the rubber insulator and the intake manifold. ) has been a constant error, while the misfires and lean code errors have come and gone. Listen for a hissing sound which is a key indicator of a vacuum leak. It's normal for the EGR valve to get hot, but if it's stuck open, it can cause the engine to stall. Does anyone have any experience of a Throttle Position Sensor (TPS) failing?I had the 60000 mile service done on my RAV4. The throttle position sensor provides feedback to the ECM to control the throttle actuator and set the throttle valve angle in response to driver inputs. The throttle looks like a carburetor without the fuel bowl, the metering jets or the float. This permits the maximum flow of air through the engine, flushing the overly rich fuel mixture out of the exhaust. And at wide-open throttle, approximately 67% to the front of the throttle shaft centerline. 6L engine, this article is intended to help you understand how the ISC (Idle Speed Control) system should work and how it may fail (my experience). I don't know why you would notice a severe drop in mpg, that don't make sense. any help would greatly be appreciated. Each sensor has the following circuits:. Shut off the engine. Knowing the symptoms of a defective throttle position sensor can help you quickly diagnose the problem and make needed corrections. The Throttle Position Sensor (TPS) is a potentiometer attached to the throttle body which notifies the ECU about the position of the throttle. * A control module (the PCM or a separate ETC module that talks to the PCM via the CAN-bus or serial data link). Open Loop Closed LOOP THROTTLE BODY ASSEMBLY If it is stuck closed, too little air will be allowed in speed. The IACV modulates airflow when the throttle is closed [let off the gas at stop or shifting].