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engine idle

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How to Troubleshoot a Car Idling at a High Speed
Car idle speed increases or decreases if there are damaged fuses, idle control valve, throttle blades, ECM, or a vacuum leak.
Symptoms of a Bad or Failing Idle Control Valve
Common signs include irregular or unusually high idle speed, the Check Engine Light coming on, and stalling while idling.
Symptoms of a Bad or Failing Oxygen Sensor
Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle.
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve
Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Throttle Body Temp Sensor
Common signs include poor engine performance, stalling, and broken electrical connections.
Symptoms of a Bad or Failing Air Cleaner Temperature Sensor
If your car is having trouble starting in the cold, the Check Engine Light comes on, or idle quality is poor, you may need to replace the ACT sensor.
Symptoms of a Bad or Failing Distributor O Ring
If your car has a distributor, common signs the o-ring must be replaced include oil leaks and engine performance issues.
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Tube
Common signs include rough idle, rattling noises from the engine, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Idler Pulley
Common signs include a damaged bearing or pulley, squealing from the engine area, and visibly worn pulleys.
Symptoms of a Bad or Failing Air Fuel Ratio Sensor
If you notice a decrease in fuel efficiency or engine power output, as well as a rough idle, you may have to replace any air-fuel ratio sensors.
How Long Does a Timing Chain Last?
A timing chain is a metal chain, as opposed to the timing belt which is...
How Long Does a Top Dead Center (TDC) Sensor Last?
The top dead center (TDC) sensor is the point from which the firing order is determined and the ignition system measurements are taken. The measurements are normally defined as before...
How Long Does an Idler Pulley Last?
The drive belt that is on a car runs nearly all of the major components of the engine. Most of the newer cars on the market have a serpentine belt rather than...
How Long Does an Idle Control Valve Last?
Among the most important factors in having a smooth running car is a consistent idle speed. Having the incorrect idle speed can lead to a variety of different issues. There are...
P0518 OBD-II Trouble Code: Idle Air Control Circuit Intermittent
Diagnostic Trouble Code (DTC): P0518 P0518 code definition If the PCM has registered an inconsistency in the engine idle RPM; the P0518 code will be stored. What the P0518 code...
How to Keep Your Car From Stalling
When driving a car, we expect it to get us from point A to point B without any issues. It can become unnerving to drive if your car stalls randomly when...
How to Check an Idle Air Control Valve
Idle air control (IAC) valves regulate the engine idle speed. Engine idle speed is the revolution speed of the engine when the throttle is inactive.

Related questions

Question
When i am at a stop light or stop sign. Randomly my car will lose power and go dead.
Poor idle can often be caused by vacuum leaks. Any air that gets into the engine without going through the proper channels will lean out the system and cause problems like you are having. Look under the hood for any...
Question
2004 crown Vic p71 sound of revving while in park at times in a high pitch
You need to check the big vacuum line that connects to the intake manifold and goes to the brake booster and the pcv valve. The big T fitting at the intake gets a hole in it and causes the vacuum...
Question
What is the normal/average RPM range for a 2010 Town and Country van at around 30-35 miles per hour?
Hello, thank you for writing in. During acceleration, the RPM's can go all the way up to 3,000. 2,000 RPM's is totally normal during acceleration. This does not mean that you are not sensing something wrong, and if you know...
Question
A couple of days off and on my truck will die and the steering wheel will not turn before this happens
You may be having a problem with the throttle control or transmission stuck in overdrive. If it feels like the engine just shuts off then it can be a problem with the throttle control actuator sticking and would need to...
Question
Reving
You will need to check the engine intake for vacuum leaks and if not then replace the sticking idle control valve and then relearn the idle by disconnecting the battery and then reconnect after 10 minutes. Start and hold at...
Question
Idle drops when pushing the clutch IN
You should first have the computer scanned for any codes that may contribute to the problem like the idle control valve or mass air flow sensor. Check all the intake hoses for any cracks between the therottle body and the...
Question
My car turned off while driving and check engine light went on,oil,and battery light and after I turn on and it was all fine
After disconnecting the battery in order to service a problem you may encounter stalling or other issues while the computer relearns idle. If you continue to have running issues after a couple days of driving then you will need to...
Question
Acceleration
You will need to have computer scanned for codes and the throttle checked for sticking throttle plates. If these are okay then you most likely have a problem with the intake leaking vacuum and will need to have the intake...
Question
I have a vw and the rpm jumps up and down as if I'm pressing the gas padel
If the engine is not idling correct then you most likely have codes stored in the computer for the problem and would need to have the systems scanned to get the codes. You may have a problem with the throttle...
Question
I have no codes but when in park car idles up and down and allready changed tps
You need to have the engine idle relearned by disconnecting the battery for two minutes and then starting and idle engine in park and then drive for two minutes each and then do same with a/c on and blower on...
Question
Iac valve
Like I said before the IAC is totally computer controlled and the computer program will move it according to how the computer is programmed to move it to prevent too high or low idle. If you have a specific problem...
Question
Hello, when my car is in park or neutral it starts to accelerate on its own.
It could be caused by several different problems like the idle control valve, engine vacuum leak, intake air filter clogged or contaminated mass air sensor or a sensor failure or engine just needs maintenance. I would suggest having the vehicle...
Question
2011 honda 4 cyl idles like it wants to turn off. Other mechanics said there were no vacuum leaks but they think it's because of c
If you are having rough idles only and engine runs good above idle then have engine mounts checked since they will cause engine vibration and think it is running rough. If okay then have a mechanic check computer sensors and...
Question
Iac
This can be caused by the main engine computer has the IAC shorted full open or there is a short in the wiring to the IAC that holds it open. If you do not get any codes or do get...
Question
Iac valve
Danny. We appreciate you contacting us and asking questions - but this issue with your Dakota is something that we really can't "guess" at what might be normal or is wrong with your Dakota. Any responsible mechanic would insist on...
Question
P0507 idle code
The code P0507 is for a problem with the idle control valve. If all other checks are good with vacuum leaks and inlet air tubes then you may need to replace the idle control valve.
Question
Hi so my car is idling low when stopped even stalled out at light. Also when driving whether accelerating or at constant speed eng
Hello, thank you for writing in. Typically issues like this stem from an issue with an air intake sensor, spark problem, or similar malfunction. Even without a check engine light on, you can still scan the vehicle for diagnostic codes....
Question
I have a 2002 mercury sable with about 128 thousand miles on it, The last few times I have started the engine cold the rpm goes up
My guess is that you have a vacuum leak. Check all of the rubber parts and hoses to make sure they are connected and in good condition. Any air that gets into the engine without going through proper channels can...
Question
my car jerks and seems like it wants to shut down when im at a red light and i roll the windows up lights seem to dim out
This sounds like it could be two separate problems. You may have been on the right track with the battery, but if the voltage drops while the engine is running, that sounds more like a charging system problem. It might...

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