Surging idle issue accord UpDATE still surges!
 

Update:

It is possible for a motor to rev to 5000 with the throttle plate closed, if, there isn't a vacuum leak somewhere?



The idle on my 90 accord surges from 1000 - 3000. Car is all stock. Temperature isn't a factor. No cel.

Help me out with some suggestions.

So far I have replaced all the vacuum lines, the iacv, fitv, and the map sensor. And disconnected the egr and charcoal canister.

I haven't checked the alternator.

Anything I'm missing?

Re: Surging idle issue accord
 

have you taken off the throttle body yet? I would degrease the piss out of it and check the tps voltage



also give the plenum a good cleaning has well and just wipe it clean




I like carb cleaner or brake cleaner for the job



Also if there is alot of build up on the throttle bodt plate area take a piece of sand paper and clean the plate and tb. Then slam the shot out of the throttle rotor to make sure you have a perfect seal


loosen up the screws that hold the throttle plate in place before doing this



Throttle body should be liquid tight.

Re: Surging idle issue accord
 

fast idle control valve its the only thing that makes them do it period

Re: Surging idle issue accord
 

I blocked off all of the vacuum ports on the manifold and it still does it....

SO, I think that it is a vacuum leak.

Re: Surging idle issue accord
 

blled coolant has well

Re: Surging idle issue accord
 

thats the problem then the ficv is need by the ecu to regulate the idle circuit

Re: Surging idle issue accord
 

The coolant has been bleed.

ficv=?
I have tried 3 different iacv's.

Re: Surging idle issue accord
 

well its not that then



what about the egr port? Those things get very clogged and could cause some issues

Re: Surging idle issue accord
 

I haven't ever heard of an egr producing basically the same surging problem as the fitv...but I will deffinitly take it off and clean it up.

Currently its 6 degrees and the wind is blowing.

Re: Surging idle issue accord
 

just thinking out loud. Anytime I do h22 swaps thats what I do has the egr ports get uber clogged up and well its worth a try