High idle 2500+

[Weedo]

Originally Posted by FormulaLT1

I never said that the MAF was what is causing his idle issue. I just said it requires replacement and it most certainly can be a IAC thats the point I am trying to make and carbon deposits on a IAC will raise your count higher and raise your idle but most likely its a stuck iac valve but carbon deposits on a thottle body blades would have to be the most severe I have ever heard of to cause a 2500 RPM idle.

There did seem to be a fair amount of carbon built up when I replaced that IAC valve. I wiped it out with a rag.

I'll have to get my cooling issue resolved b4 I can drive it enough to see how it's gonna turn out.

[FormulaLT1]

Well, Good luck. Hopefully it will be a easy fix.

John

[Weedo]

Well the idle seems to be improved but is still a little high. When the engine is cold it seems to be higher. I wonder if it would hurt anything if I pulled that IAC valve off and hit the inside of the intake with carb cleaner. I'm thinking the carbon build up inside it may be affecting it also.

[FormulaLT1]

The way you clean a IAC is with carb cleaner, so yes its perfectly fine to take out the sensor and use carb cleaner on it. Just be careful not to get the cleaner on the harness end and not a big whoop if you do, just make sure its dry before reinstalling the harness or I'm sure you can figure out what would happen. Good luck.
John

[Weedo]

I removed the IAC valve and cleaned the crap out of it with carb cleaner. It's about as clean as I'm going to get it. Still has an 1100 rpm idle, which I can live with. Still, I wonder if there's anything else to be done which may bring it down to the suggested 600 rpm range. That's what my truck idles at.

Hope I'm not beating a dead horse here. I wouldn't want to end up on someone's 'You Suck' list.

[FormulaLT1]

Have you had your car scanned for codes?.
Sounds to me like its most likely a vacuum leak but there could be a couple possible other causes.

Also beating dead animals is a useless hobbie, sure its fun but what purpose does it serve?. Keep up your level of suckage and you will be on the list in no time.

[Weedo]

I'm not beating as a hobby or for the fun of it. As a non-mechanic I must ask many questions to get to the bottom of something mechanical.

The only codes returned on my Firebird were cooling system related... so I was told by the dealer. I got that fixed. Now I'm going to explore the vacuum leak angle. Thanks for the input.

[Weedo]

I found out I have an intake manifold gasket leak. I guess this could be part (the main part) of the idle problem also. Checking the Chilton manual I see that this is a big job and that there is an upper and lower gasket. Anyone ever replace theirs before? I was quoted $600 at a repair shop. Eeeeeee!!!

I checked the thing out with my own code scanner and got no codes.