Could also be the idle air control valve. Read this: http://rds.Yahoo.com/_ylt=A0geu5Dx19NHdfsAi8FXNyoA;_ylu=X3oDMTE5MWc1cmxhBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkA1FSVzJfMTE4BGwDV1Mx/SIG=12ug709tt/EXP=1205152113/**http%3a//www.tomco-inc.com/Catalog/27idle%2520air%2520control%2520motors.pdf
There are several things that can cause your 2004 Chevrolet Trailblazer to idle rough. The most common causes are a dirty fuel filter or a dirty air filter.
There are several things that can cause your 2002 Kia to idle rough. The most common cause will be bad spark plugs or a bad spark plug wire.
The most common cause of a 1996 Ford Escort to idle rough is bad spark plugs or bad spark plug wires. A plugged air filter will also cause it to idle rough.
The most probable cause is it requires servicing.
The most common reason for an engine not to start is a lack of fuel. A plugged air filter can cause and engine to idle rough or not idle at all.
There are several things that can cause your 1993 Nissan 300 to idle rough. The most common cause is dirty spark plugs. Bad spark plug wires can also cause the problem.
A bad spark plug, a bad spark plug wire, a bad distributor cap, a bad rotor, a bad fuel injector, the firing order is mixed up, a bad valve or a vacuum leak could cause your rough idle.
There are several things that can cause your 1999 Ford Crown Victoria to idle rough when it is cold. The most common cause is a leak in one of the vacuum hoses.
Depends most common on older models is rough idle and or suspension starting to go.
When the AC is on most vehicles increase the idle speed. That can often mask the problems that cause rough idle. The primary suspects are: EGR valve, tune-up, sticky or plugged injectors and valves.
There could be several reasons that your 1995 Chevrolet pickup truck, will not accelerate and idles rough. The most common reason is a plugged fuel line.
There are several things that can cause your 1997 Kia engine to idle too high. The most common cause is a malfunctioning fuel pressure regulator.
If the check engine light has not come on, it is most likely a vaccume leak.
it might be your egr valve. there is most likely a little piece of crud or carbon stopping the valve from closing all the way this causes a rough idle. 20 minute fix at a shop.
most common cause, a vacuum leak.
There are numerous different signs of a bad fuel injector. The most common signs are reduced gas mileage, a rough idle, and an engine misfire.
The most common problems are usually vacuum related. Try checking the pcv valve. If that isn't it it could also be something like the idle air controller. This is supposed the regulate air around the throttle plate when it is at idle. Also try running some good injector cleaner through the tank. I like using Sea Foam. I have seen bad spark plugs cause rough idle. It really could be caused by several things. Anyway, I hope this helps.
The most common cause for an engine to die out, while idling, is the idle speed is set to low. You can adjust the idle speed with the fuel injector vital screw.
I will talk about fuel injected engines since they have been common on most cars since 1987. Idling problems could be several problems. A dirty idle air control motor , dirty mass airflow sensor or dirty air filter will cause idle problems. Spark plugs that are wore out will cause a cylinder to now fire correctly. A wore or sticking injector will cause idle problems. The most common problem I find as a mechanic for idle problems is a faulty coolant temp sensor. So the three major systems to check are the AIR, FUEL and SPARK .
Most likely bad intake manifold gasket. When the engine is cold the engine shrinks which unseals the intake and allows a small amount of unregulated air into the engine causing it to idle rough. as the engine heats up it expands sealing the leak causing idle to improve. You should also get lean codes from the computer as the engine is running to lean. Very common problem with the DOHC engine. See "Related Questions" below for more
One cause is the IAC (idle air control) solenoid. which is the most common on Chrysler products. .
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How do you know it is surging? The most common cause for a jump in idle speed while the AC is running is when the cooling fan cycles on and puts a draw on the alternator.