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It is a common suspect in contributing to rough idle.
See "Related Questions" below for more about the EGR valve, from testing to replacing.
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∙ 15y ago
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Can the egr valve affect the idle?
Yes. Carbon deposits in the EGR valve can cause it to stick open a bit and cause a rough idle. If it is bad enough, the engine will stall out when you slow to a stop.
What is cause of rough engine idle?
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.
What will cause a 1996 tbirds 6 cly engine to idle a little rough and be smooth at around 1300rpm?
You have a bad idle air control valve, I just went through this with mine.
1993 subaru legacy rough idle- what could be causing it?
If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
What may cause a 1996 Ford Escort LX to idle rough and that has stalled a few times while reversing?
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.
Why would a 2002 Kia Spectra idle rough in drive?
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.
Why does my 1986 ford f150 idle rough and sometimes stalls?
A bad IAC (Idle air control valve) or a vacuum leak or both.
What would cause a1989 Chevy 4.3 l v6 to idle rough?
vacuum leaks, stuck or leaky egr valve, leaking intake, bad valves, ect
What will cause a GL 1800 to idle rough and have sluggish acceleration?
A bad fuel injector.
Why would a 1996 Ford Contour idle rough once it gets hot?
possible vacume leak in the egr valve or bad valve itself.
What would a bad EGR valve gasket cause?
Poor performance, poor economy, rough idle, lean burn causing valve or piston problems...
What would cause a 1999 Honda Civic EX to stall at stop lights and idle rough?
Possibly a bad idle air control valve...if you have a check engine light on, take it to auto zone and they can check it for free. If not, take it to a mechanic
