Unstable idle

[Tano016]

Hi,

I've noticed that my idle is unstable on my 2001 integra gsr, its worse on hotter days. When i rev the engine to 2000rpm and let go it goes down to like 200 rpm then it re-stabilizes. Someone told me that it might be the iac valve, others say that it might be a vacum leak somewhere. Does this affect the performance of the car once your off idle?

Any help would be appreciated,
Thanks

[ryan96gsr]

the same thing happens to my teg 96 gsr w/type r head on hot days the idle drops i changed the spark plugs the wires my msd cap rotor fuel filter an still same shit

[faygo_freak]

i had same problem in my protege...changed wires and that helped a lil for a while then my vacum hose got a HUGH gash in it...replaced it and long story short...no more unstable idles

[97integrals]

Originally Posted by Tano016

Hi,

I've noticed that my idle is unstable on my 2001 integra gsr, its worse on hotter days. When i rev the engine to 2000rpm and let go it goes down to like 200 rpm then it re-stabilizes. Someone told me that it might be the iac valve, others say that it might be a vacum leak somewhere. Does this affect the performance of the car once your off idle?

Any help would be appreciated,
Thanks

Does it only idle low after you give is gas or does it always idle very low?

[Tano016]

97integrals:
When i'm in neutral and i don't give it gas it's fine. If while i'm in neutral i give it gas and let go it will go down to like 200 rpm and re-satailize, it feels like it wants to turn off.

[V T E C H]

I have the same issue. My car needs a new IAC valve. YOurs could be a diffrent issue, but thats just whats up with mine.

[97integrals]

Originally Posted by Tano016

97integrals:
When i'm in neutral and i don't give it gas it's fine. If while i'm in neutral i give it gas and let go it will go down to like 200 rpm and re-satailize, it feels like it wants to turn off.

is the check engine light on?

[Tano016]

Originally Posted by 97integrals

is the check engine light on?

No, it isnt.

[97integrals]

Originally Posted by Tano016

No, it isnt.

Usually a bad iac valve will throw a cel, I would test your vacum system first.