Rough ideling 98 Chevy Lumina

rough
lumina

#1

My Lumina runs great but idels rough. I,ve changed the plugs, wires, air and gas filters. Anyone have what I should check next?? Thanks for your ideas…


#2

No Check Engine light?

Tester


#3

The check engine light is not on… No lights are on…


#4

Spray some throttle body cleaner in the intake and see if that improves the idle. It may be dirty.

OR, it may be a faulty IAC (Idle Air Control) valve.
This isn’t a given, but seems to help most non-idling problems.


#5

If Roadrunner’s suggestions do not help, try reading codes anyway. Sometimes they can have codes without the light on.

Some auto parts stores will read them for free.


#6

You could have one cylinder with low compression. Do a compression test if the other things you try don’t cure the problem.