90 wont pass smog

[tccrab]

Originally Posted by TonyTZR1

I checked the idle myself, brought it up to the 2500rpm required for the smog test and after a couple of seconds, engine at normal operating temp, the idle drops down by 400 to 500 rpm then immediately goes back up to the 2500rpm.

Really appreciate everyones help, what the hell is a computer? Man what a cluster.
Tony

Tony:

If I read this correctly, your idle is up around 2500 rpms?!!

If your idle is this high, then your problem sounds a little like what my buddy Joey Gibson had about a year ago. I will attempt to dig up his posts and his answer, but in the end I think it turned out to be a bad ECM.
I'll go digging around...
The posting is over on the CF and I'm no longer a member there, but if one of you guys will go searching for user name JoeyGibson you will hopefully find his thread on solving his high idle.

My idle was running around 1000-1200rpms at most and was variable. No where near the 2500rpm you mention.

Tom