Some General Motors owners have been experiencing throttle body issues this past winter. This problem seems to be most common if you drive a GM vehicle that is about 3 — 5 model years old and live in a region that experiences cold temperatures during the winter.
We mean really cold, around 20 o F or below. This is just an issue that has increased lately and is important for GM drivers to know. For your engine to function properly, it needs the proper ratio of fuel to air. The throttle body controls the amount of air that goes into your engine. Here is a good description from Car Talk. The harder you push the more gas that goes in. A sensor decides the appropriate amount of air to let into your engine in response to the amount of gas added. When there is a problem with the throttle body, the wrong amount of air goes into your engine.
It seems that cold temperatures are causing throttle body failure. If you have a throttle body problem, your check engine light will come on and your vehicle will most likely go into reduced power mode.
GM Throttle Body Issues in Extreme Cold
This means you will probably not be able to drive more than 25 — 30 mph. Thanks again Mother Nature for a fabulous winter. Go to www. PedalsandPumps provides direct, honest information about car maintenance and repair. We provide money and time saving tips for readers who want to maximize their dollar and simplify their auto owning experience.
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GM Throttle Body Problems
TIP: If you have lost a cap on your tire inflation valve, mention it at your next oil change and the technician will probably replace it for your for free. More ways to tell if you have a tire pressure issue.If your GMC Terrain has a bad throttle body, it can cause it to run terribly.
Common symptoms of a bad throttle body include, dirt and grime, the check engine light, and an erratic idle. You control the throttle body position with the gas pedal. So, the symptoms of a bad throttle body will all affect how the vehicle feels responding to your throttle input. A rough idle is also a very common symptom.
Here are the most common symptoms of a bad throttle body in your Terrain. The problem with almost all of the noticeable symptoms are that they can also indicate problems other than the throttle body as well. It can tell you a lot about what is going on. The check engine light is one of the most common symptoms of a bad throttle body in your Terrain.
The check engine light itself being on is not a bad thing. The trouble codes that are stored in the computer can tell a lot about what is actually going on. This makes diagnosing the throttle body much easier.
While coming to a stop, you may notice that your Terrain feels like it wants to die. The RPM may shoot up by as much as until it finally finds the proper idle speed. This is a telltale sign of a dirty throttle body. It would be prudent to inspect the throttle body to see if there is any grime buildup present.
A dirty throttle body will exhibit many of the symptoms of a bad throttle body. Make sure that you use throttle body cleanerand not brake parts cleaner, WD40, or even carb cleaner. Cleaning it is easy and cost effective. If any of these sensors goes bad, it can feel the same as a bad throttle body.
It can really narrow down what you are looking for. The idle speed will keep jumping. Most of the time, if it is the throttle body, it just needs cleaned. An engine misfire or bad MAF sensor can cause the same set of symptoms. Service Engine Soon Light The check engine light is one of the most common symptoms of a bad throttle body in your Terrain.
If there is anything that you would like to add, please feel free to leave a comment below.Cleaning the throttle plate and throttle plate bore on the 4. Well, when gum and other oil and carbon deposits form behind the throttle plate and accumulate to the point that they may interfere with the throttle plate movement and strip the plastic gears that make up the Throttle Actuator Motor that opens and closes the throttle plate.
Cleaning the electronic throttle body is not hard to do. But you do need to take some very important precautions:. All Tutorials: 4. So I stole a bike and asked for forgiveness.
This material may not be reproduced without the author's consent. Page 1 Page 2. Symptoms Of A Dirty Throttle Body 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.
Rough idle. In extreme cases, the deposits can become so built up that the throttle body plate will become stuck, striping out the plastic gear drive of the TAC motor.
Applies To:. Buick Vehicles:. Do NOT follow this link or you will be banned from the site! Hate Spam.Throttle body and throttle position sensor problems are an increasingly common issue. However, the throttle body used in this engine is similar to the model used on a massive amount of General Motors cars and trucks. Also see if extended coverage under the manufacturers warranty applies to you.
Finally, review tips for getting it covered or how to fix it yourself if all else fails. Long gone are the days of stepping on the gas pedal and moving a throttle cable to open the throttle plates. This simple mechanical connection worked for years with literally no problems. Unfortunately, technology marches forward and car makers needed to control the throttle body in a different way.
With traction control, stability track, collision avoidance and adaptive suspension systems the computer wants to control throttle position. They once entrusted this to the driver, but in a world filled with distractions, car companies decided to intervene.
Even worse is when these components last long enough to survive through the warranty period and then wind up in the lap of car owners when they fail past the warranty date. The General Motors throttle body is an excellent example of this issue.
The throttle body assembly is a self-contained unit. It opens and closes the throttle using electronic signals to control an actuator. This component is also built into the self contained unit. Therefore if any failure occurs with the actuator or sensor, replacing the complete assembly is necessary.
With the amount of failures of the GM throttle body reaching epic proportions Cadillac decided to get out in front of the issue. They sent me a special policy letter for my Cadillac SRX with a 3. Paraphrasing from the letter it says: as the owner of a model year Cadillac SRX your satisfaction with our product is very important. This letter is intended to make you aware that on some 3. This might be accompanied by the illumination of the reduced power message indicator.
Extension of the warranty on this item is for 10 years ormiles, whichever occurs first. I also received a special policy letter on the timing chain. I appreciate the fact that General Motors wants to do the right thing and repair cars with the defective throttle bodies.
Unfortunately, diagnosis, confirmation and implementation of the no charge repairs are left up to individual dealerships. Despite the fact the dealer would get reimbursed if they replaced the part, no questions asked, it can be difficult to have them agree to cover the repairs.
General Motors under compensates dealers for warranty repairs. This is kind of like a Medicaid patient going into a doctor. They get reimbursed pennies on the cash dollar for auto repairs. However, your vehicle will have to meet strict requirements. Specifically, a check engine light code for a throttle position sensor error. An example is a code P through P This series of codes indicate problems within the self-contained throttle body unit and its components. You often see codes like P on older vehicles.
If you received a special policy letter make sure you make a copy and retain it for your own records. Then have the dealership attach it to the repair order that you signed.
If the dealership says they will not cover the repairs, document their reasons why. Provide them with the repair order numbers and documentation listed above.The throttle position sensor TPS is part of your vehicle's fuel management system and helps ensure that the correct mixture of air and fuel is delivered to your engine. The TPS provides the most direct signal to the fuel injection system of what power demands are being made by the engine.
The TPS signal is continually measured and combined many times per second with other data such as air temperature, engine RPM, air mass flow, and how quickly the throttle position changes.
The collected data determines precisely how much fuel to inject into the engine at any given moment. If the throttle position sensor and its other sensor partners do their jobs correctly, your car accelerates, cruises, or coasts smoothly and efficiently, as you expect, while maintaining optimum fuel economy.
The throttle position sensor can fail in several ways, all of which result in poor fuel economy at best, and performance limitations that may create a safety hazard for you and other motorists at worst. It can also cause problems when changing gears, or setting base ignition timing. This sensor can fail gradually, or all at once. This is intended to at least allow a driver to get off a busy highway in a safer manner.
Replacing the TPS will include clearing relevant fault codes, and may require software reprogramming of the new TPS module to match other engine management software. This is all best left to a professional mechanic who can provide you with a diagnosis, and then install the correct replacement part. It may feel as though the car simply doesn't accelerate as it should, and jerks or hesitates as it picks up speed. It may accelerate smoothly, but lack power. If these symptoms occur, there's a good chance you've got a problem with the TPS.
When the car accelerates while driving, it usually means the butterfly valve inside the throttle has closed up and pops open suddenly when the driver presses on the accelerator. This gives the car an unintended burst of speed that occurs because the sensor cannot detect the closed position of the throttle. If you start to experience engine misfires, stalling, or rough idling when the car is stopped, it can also be a warning sign of a failing TPS.
You don't want to wait to get this checked out! If the idling appears off, it means the computer is unable to identify the fully shut throttle. The TPS can also send bad input that ends up stalling the engine at any time. This is another failure mode of the TPS, which indicates that it is falsely limiting the power being requested with your accelerator pedal foot.
You may find that your car will accelerate, but not beyond a speed of 20 - 30 MPH. This symptom often goes hand in hand with loss-of-power behavior.
Have your vehicle checked for trouble codes to verify the source of the problem. The throttle position sensor is key to getting the desired power and fuel efficiency from your vehicle in any driving situation.
As the symptoms listed above make clear, failure of this component has serious safety implications and must be checked out immediately by a qualified mechanic.
The most popular service booked by readers of this article is Fuel System Inspection. Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair. Schedule Fuel System Inspection. Service Area. Average rating fromcustomers who received a Fuel System Inspection. Here are some common symptoms of a bad or failing throttle position sensor to watch for: 1.
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Unfortunately, this is how we pay the bills and our authors. We would love for you to enjoy our content, we've worked hard on providing it. Please whitelist our site in your adblocker, refresh the page, and enjoy! In addition to the recall of aboutChevrolet Malibu sedans, General Motors has also added 2.
The problem: This recall affects multiple models for a variety of reasons. The largest recall, encompassing about 2. The sixth-generation Corvette is recalled for a possible loss of low-beam head lamps, while the Cadillac CTS may experience windshield wiper failure. Number of affected vehicles: 2, previous-generation cars are recalled for tail lamp malfunctions.
Only full-size trucks are recalled for the tie-rod defect. The fix: For the passenger car recall, affected vehicles could have corrosion in the wiring harness, which dealers will fix free of charge. The Corvette recall, caused by the electrical center housing expanding when the engine gets hot, will be repaired free of charge, although Chevrolet has not named an exact fix for the problem. They have received several hundred complaints on the matter, but no crashes or injuries have been reported.
Dealers will replace the front wiper module free of charge. GM says it is unaware of any crashes or injuries due to the condition. The fifth recall, involving certain Silverado and Sierra pickups and Chevrolet Tahoe SUVs, is for a tie rod attachment to the steering gear which may not be tightened properly. Customers are instructed to have their vehicles taken by flatbed to their dealer, where the inner tie rods will be inspected for correct torque, and, if necessary, the steering gear will be replaced.
The issue was discovered during assembly, which is why only a small number of vehicles are affected. Sam loves to write and has a passion for auto racing, karting and performance driving of all types. But from the eyes of the consumer and the market, this is highly discouraging. GM has got to put a stronger emphasis on quality!!! How are all of these defects getting past inspectors?!
One of these recalls actually multiple ones for the same issue included an engine fire problem which Ford had to issue a park car order. What would damage sales if one of the new models was found to have an issue which lead to deaths. I will agree the Escape has a bad history of Recalls. As a Ford fan, i always want to see Ford come out on top, but as an American, i cant help but want GM to be at the top aswell.
Its ashame that all this bad publicity is probably turning people away from domestics, which sucks. As for sales, i believe there is a fine ratio between those leaving the brand for trust issues, and people intrigued to the brand because of the improvements over the years, if these recalls continue we may see a dip in sales for GM products.الثروتل بوابة الهواء فك اصلاح وصيانة Toyota Ford Nissan Chevrolet Throttle Body Repair and Clean
GM builds some fantastic vehicles, but this is nonetheless concerning for its future. The Escape is a case in point — it has had more recalls than any vehicle than I can remember. All that said, sales are still at a record high for the Escape. I mean where are you going to go — Toyota?In plain English, this means that the PCM does not have a good path to Ground either because the Ground wires' terminal breaks or gets corroded. The times I have seen this specific problem, I have seen one or all of the following symptoms:.
You might be wondering if just cleaning the battery's ground cable is enough and I can tell you that it's not enough. Cleaning the battery ground terminal at the battery or where the battery ground cable bolts to the engine or the chassis is a good idea but the PCM's grounds don't connect there The PCM's grounds unite at a certain point in the wiring harness and share the same terminal that's bolted to a point behind the passenger side cylinder head and this terminal is not easy to access.
Testing the PCM's Ground circuits all 8 wires is not hard since all you need to do is to test just one Ground wire for a Voltage Drop and you're able to test them all I'll explain how to do this in this article. The second most common problem I've seen, is the Electronic Throttle Body's connector having a copper wire break inside the insulation at the point where the wire enters the connector.
The local GM dealerships have always recommended replacing the connector for several years now to their service customers when an Electronic Throttle Body is replaced by their service department. Well, this is a recommendation that you should follow too. All Tutorials: 4. Melvin Udall: Never, never, interrupt me, okay? Not if there's a fire, not even if you hear the sound of a thud from my home and one week later there's a smell coming from there that can only be a decaying human body and you have to hold a hanky to your face because the stench is so thick that you think you're going to faint.
Even then, don't come knocking As Good As It Gets. This material may not be reproduced without the author's consent. Page 1 Page 2 Page 3 Page 4 Page 5.
Applies To:. Buick Vehicles:.
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