96 3100 revs at idle

[white4d96]

My 3100 keeps revving itself to like 1500 and back down randomly at idle. No MIL's, haven't scanned for codes. Does it much more on cold starts. IAC?

[94 olds vert]

IAC is possible.PCV valve?

[RobertISaar]

i know you state randomly, but is there ANY kind of pattern? after a coastdown from a certain speed, just after cranking, when the sun comes out from behind the clouds?

 

IAC is possible, PCV.... i guess, if it sticks intermittently, it might do it.

 

MAF may also be suspect. tap on it with the handle of a screwdriver when it's acting both normal and crazy, see if it causes or fixes the issue.

[white4d96]

There's no real pattern but its more frequent as the car warms up. I don't think it happens until after the temp gauge gets off the floor though.

[dodgethis]

Clean your Mass Air Flow sensor. I know My lumina started doing that everytime when i would restart. I went to town on the air box (just because i was bored), and took some Mass Air Flow cleaner and sprayed it well, and put back together, and haven't seen it do that in a while.

[Addicted to eaton]

yeah my guess is maf

[white4d96]

Lo and behold I have maf cleaner!

 

I have a list for Friday when I get off work since I'm going to stay up anyways (I work nights now) so I will try it then.

[threepointone]

My 3100 keeps revving itself to like 1500 and back down randomly at idle. No MIL's, haven't scanned for codes. Does it much more on cold starts. IAC?

 

if you do replace the IAC i had good luck with BWD,napa,and delco valves the autozone brand never worked for me

if you ever need a hand working on your W i live 15 minutes north of you:thumbsup:

Edited March 9, 2011 by threepointone