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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 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 made of rubber. The chain is located inside of the engine and needs to be lubricated by...
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 to Buy a Good Quality Idle Control Valve
There are many different times when you will be idling your car; when you’re sitting in front of the gas station waiting for someone to go in and grab a snack...
How to Buy a Good Quality Idler Pulley
The idler pulley system drives a car’s alternator and is part of a belt and pulley system that also covers power steering, the air compressor, and other devices. The pulley is essential;...
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...
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
Stuttering when idle but the revs sit steady at 900 rpm and there are no issues accelerating.
Hi there. Sounds like the lift fuel pump is malfunctioning or there is air in the fuel system. First, check the fuel level in the fuel tank and make sure that there is at least a half tank. Then check...
Question
I need help on locating the air idle control valve on my 06 impala
Hi there. The idle air control valve (IAC) is located on the throttle body on the left. When you remove the IAC valve you will see it as it looks like a plunger on the part. If you need further...
Question
High idle
Hello. A high idle can be caused a few different things. If a squirrel chewed up your air filter it may be possible that it chewed on an intake hose, or another part of the intake tubing, which is now...
Question
Whining noise when the engine is at idle.
Hi there. The whining noise that you are hearing is the gears and timing chain in the engine. This is a normal condition and all of the Porsche engines have the same sound. If your engine has an inner cooler,...
Question
Problem with secondary air injection and the idle is hunting.
Hi there. When the air pump is working and the engine is running fine and then when the air pump is turned off and the engine idle starts to hunt, then there may be water in the air pump or...
Question
1998 dodge viper gts letting of throttle rpm hang 2100 for about 10 to 15 seconds then drop to 700 where it should be.
Hi there. Check the engine for any vacuum leaks. Check all of the vacuum lines to the engine and the brake booster. If there is no vacuum leak, then check the idle air control valve (IAC) and see if it's...
Question
Will not stay running.
Hi There, It sounds like you may have a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low...
Question
Rough Idle After Engine has Heated up.
Hi there. Check the engine oil pressure. When the oil is cold, it is thick and when its warm its thinned out. If the oil pressure drops lower than 25 psi, then the variable valve timing solenoids will not work....
Question
Dies when you stop pushing the gas.
Hi there. There could be an issue with the throttle body sticking and not adjusting correctly. Check the idle speed when the vehicle is parked in park and then in gear. The engine idle should be around 1000 rpm's in...
Question
Car Stalling
You would benefit from a stalling diagnostic. The responding certified mechanic would check for diagnostic trouble codes to see if there are any obvious clues. If no codes have set (this is checked with a scan tool), among the likely...
Question
Car shuts down quite often?
Hi There, It sounds like you may have a dirty or faulty idle air control valve. The idle air control valve reads the air intake as it comes into the motor. This is controlled by the car's ECM which uses...
Question
My XC90 Volvo 2006 I thought was the PCV system so I had all the hoses there changed as well as the oil catch can but my engine li
There are more than ten principal causes of rough idle and that list doesn't include potential mechanical faults such as uneven cylinder compression. By far, the most efficient strategy to resolve this issue is to request a rough engine idle...
Question
Engine wanting to shut off at complete stops or slowing down lower than 15mph
Hi There! It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate and eventually stall. The idle air control valve is a small valve on the engine's intake system that...
Question
Red lined engine by accident and now the engine idle is higher than normal. Smell something burning like rubber.
Hi there. The engine revving up higher than normal could be caused by the idle air control valve (IAC). The valve could have gotten stuck when the engine was throttled rapidly when first started. Check the IAC and see if...
Question
Engine cranks but doesn't start when warm, idling around 1000 RPM in park.
Hi there. Check the idle air control valve (IAC) and see if its sticking. The IAC valve controls the engine's idle and makes sure that the engine idle is set to the factory setting of 650 to 750 rpm's. If...
Question
Engine surging and has a loud noise in Sport mode.
Hi there. Check the idle air control valve (IAC) and see if its working. The IAC controls the engines idle and operation. If the engine is surging, then there is a good posability that the IAC valve may not be...
Question
Racing engine
The idle may be high due to a vacuum leak at the pcv hose where it connects to the back of the intake manifold. It gets a hole in it causing a large vacuum leak. The hole may change in...
Question
Idle in drive then died now won't crank or start
Hi there. Sounds like the engine gas recirculation valve (EGR) is coming on when the engine is at an idle. Check the EGR and see if its plugged in and working. If so, then remove the EGR valve and clean...
Question
After I turn the key off the engine keeps going and splutters
The engine can continue to try and run on cars with carburetors that are not functioning correctly or not adjusted correctly. If the base idle speed is set above about 500 rpm then the engine can try to continue to...
Question
Car keeps idling down and shutting off when I drive it.
Hello there and thanks for writing in. Generally belts will squeak when they are loose or not aligned correctly. Occasionally, they may need to have a bit of belt dressing put on them to lubricate them. Your idle issue may...

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