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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
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
2001 mitsubishi montero limited. Need to calibrate idle air valve.
Hello. In order to properly adjust idle speed on this vehicle you will need a scan tool. The vehicle will need to be put in relearn mode to do so. Over time the computer will adapt on its own if...
Question
My 2001 automatic Miata idles really rough at stoplights when I run the AC, but not when it is off.
Hello, thank you for writing in. Two aspects about the issue lead me to believe the previous technician is correct. To start, the compressor is the only component that will effect the engine, as it is the part connected 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
suzuki ltr450 moves on its own
Claimed by Kevin Gainer
Question
1994 dodge ram died when idleing trying to fix it up myself needing some help
You should have the throttle body and the idle air control valve cleaned out. Check the engine for any vacuum leaks and also check the purge control valve for leaking fumes from the fuel tank when it should be closed...
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
Engine shaking rough idle losing power and burning rich
Hello, thank you for writing in. The first step when having these issues is to scan the vehicle for diagnostic codes, regardless of having a warning light on or not. With no codes, it will be a process of elimination....
Question
Car stalls at low speed
Your idle air control valve can be stuck closed and not raising the idle to keep it from stalling when coming to a stop. Also if you have an engine vacuum leak it can also cause this problem. You did...
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
Jeep dies in while idling. Still has power, can be put off by reving in neutral. Already cleaned IAC valve.
You should have the computer checked for stored codes and see if there is codes to the transmission overdrive or shift solenoid. If not then you will need to check engine for vacuum leaks and replace idle control valve if...
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
Low idle
You should first want to check the engine for any vacuum leaks and then if the engine is equipped with an idle control valve test it for proper operation. If it is not working then replace the idle air control...
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
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....

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