Idle problem

[Torqstr]

Hi guys, my first post. Some of you "might" know me as maxsideburn from the 3geez forum. I've just decided to buy a 90 coupe and I need to know what could be causing this problem.

Here's what's going on now. The car will start and idle roughly, it will die if not revved up until warm. Once it's warm it still continues to rev up and down a lot by itself.

Now considering my knowledge of 3G Accords I'm assuming this is one of three things, EGR valve problem (stuck open, or something along those lines), vacuum leak somewhere on the intake manifold, or just some sensor completely screwed.

As a side note I should also mention that the exhaust is screwed, pretty much everything from the cat-back is falling apart and leaking.

[xwade01]

Hmm.. i'm not sure if it could be the IACV but have you checked that or anything?? Because thats happened to me once, and then I cleaned the IACV out and it didn't happen again. Other then that I really can't think of anything to cause your idle besides what you stated above. I mean I know the CTS (coolant temperature sensor) could cause a bad idle but that don't sound like your problem.

[aero]

So it does it constantly? I would say its a gasket/vacuum line leak. Just listen for hissing sounds.. feel around the IM and see if you can feel anything, or spray some carb cleaner.

If its not that, try the iacv as said above.

[cb7dazz]

yea I had the same problem, it was the iac valve

[casterX]

here's a DIY for the IACV

http://www.cb7tuner.com/vbb/showthre...highlight=idle

[Shehzada]

...........EGR valve problem (stuck open, or something along those lines), vacuum leak somewhere on the intake manifold, or just some sensor completely screwed.

I also have the idle that jumps up and down. Try this test. Try pulling or pushing up on the EGR diaphram while the car is idleing. If that stops your crazy revs, then start looking for an EGR.

[cp[mike]]

well we know its something on the intake side. if i were you, id pull the FIV, EGR, and IACV off of the manifold and clean them all out. tighten the FIV screw if its loose. reattach to manifold with fresh gasket maker. bleed any air out of the coolant, run a can of seafoam through the manifold, and check for any gasket leaks. adjust the idle screw and make sure none of the vacuum nipples are bent and leaking air in around their edges.

its all simple and easy to do, it may seem overboard for what may be just one tiny leak or one sensor, but all of those suggestions can only help... maintenance things you should do anyway on a car this old.

good luck with it sir, glad to have you on the site.

[h22sparkle]

also beware that the iacv may also not wanna shot a code when its messed up too .

[MangoMechaniX]

You have 2 threads, talking about the same problem, at the same time.