aklim

Just because it is clean doesn't mean the passages are. I would still remove the IAC housing and clean the passages. Please tell me you didn't reuse the IAC gasket when you got it?

I would get a set and change the whole lot after I cleaned it out. Probably the top plate gasket, TB to manifold gasket, IAC housing gasket, IAC to housing gasket and maybe there is another one? IDK about stock TB but I would change every gasket you take apart to prevent leaks. You don't just use your buddy's old condom so don't reuse an old gasket.

aklim

I'm confused now that I re-read the post. If you have no scanner or tuning program, how did you tune the idle since your title is "Crazy Idle Almost Tuned" and you mentioned ?

:confused 2:

Christi@n

No no aklim i've replaced every single gasket with a new one, and i'm pretty sure that i've well cleaned the passages in IAC housing and even TB.

aklim

Screws are not the issue since I think they dead head. I'd be afraid of Locktite the next time you have to take them out and you will have to do it to clean the passages.

Did you remove the IAC housing and the top plate to clean the passages or was the TB new?

aklim

OK. 2 years ago we were chasing a leak because my buddy reused the gasket and it leaked.

Have you tried borrowing a scanner from Autozone, O'Rileys, Advanced Auto or someplace that has one?

Christi@n

This is an old thread, and i was sure to had tuned the idle, at that time.
But i've recently known that it should be around 750rpm, and not 900rpm.

So i re-post it

aklim

Did you tune the idle via the ECM or just adjusted the screw? Besides, 750 or not is dependent on the system. Mine is set to command idle at 900 because of the set up. So if the ECM is commanding 900, you will never get 750 without a lot of rough running. Hence the stupid questions I ask.

Christi@n

OEM TB removed, cleaned and re-placed in, with new gasket set

Christi@n

Since that i'm writing from the other side of the ocean, don't think that to borrow a scanner from autozone could be good idea

aklim

Just out of curiousity, what TB did you buy? Also, what other mods?

Christi@n

No one i've bought. I've cleaned the one cames from factory with car

No mOds on my vette, as far as i know

aklim

OK. I guess at this point you are going to need a scanner to see if your RPM is right along with the IAC count at the very least. Also, the command idle would be nice. We have no idea what the PO, aka moron who might need to be shot might have done.

pcolt94

Just as a suggestion, was the EGR checked
And also check the brake booster for a vacuum leak .

Christi@n

Brake booster seems to be good condition, if i try to open test valve (on the fron of its) i will hear a pfssss.

Egr never checked

Christi@n

How to. Check EGR?