idling problem on a 1g
 

my 91 gs has an idling problem it jumps up and down from 2 to 1500 rpms. and ive replaced it with 3 different sensors so what else could make it do this.

RE: idling problem on a 1g
 

check for vacuum leaks that would be a real good start to finding the problem. Maybe even plugs and wires.

RE: idling problem on a 1g
 

vacuum test on what, i was going to change the spark plugs but ran out of money... lol

RE: idling problem on a 1g
 

It could just be that your adjustments are off or that you are adjusting it incorrectly. Remember, there's a CTP switch that needs to be adjusted BEFORE adjusting the TPS. From there you can adjust your idle base settings.

Joel, CA

RE: idling problem on a 1g
 

also check your altanator belt, mine slips when it's loose and runs bad.

RE: idling problem on a 1g
 

do u have an aftermarket bov?

RE: idling problem on a 1g
 

my bad ist a gs nevermind

RE: idling problem on a 1g
 

Does it run rough or does it sound like it's hunting? (Like someone is revving the engine up and down)

RE: idling problem on a 1g
 

you have idle surge. tell us what youve tried to replace to far. Possibilities are a bad isc motor, idle adjustment is off, bad egr, dirty tb, missing/bad vacuume line. no matter what it is, it will be located around the tb

RE: idling problem on a 1g
 

ISC? I'm guessing you mean IAC motor? That was what I was thinking it is...