Idle Sticking ? ?

[jt98boost]

Sometimes my idle will stick at 2000rpms and will not come down unless I rev the car a few times or if I cut the car off then restart it, I have noticed while it is stuck at 2000rpms I can unplug the Idle air control and the idle will fall back to normal, I tried another IAC a while back but it hung with that one also. Is there anything else it might be or should I try another IAC

 

[Kilgore Trout]

There is a mod called the "copper cap mod" or called the "IAC restrictor plate mod". Try a search for those phrases...

 

[jt98boost]

Yeah, I might try that copper cap mod, But I have a question on how the IAC works, I notice that when the car is at idle I can pull the hose off of the IAC and it has no vacume on it, but if I rev the car with the hose off the IAC opens and pulls vacume is this normal??

 

[Mike97gt]

if the engine stays running with the IAC disconnected then you have air entering the motor when it should not.

I would look and see if you have a partialy opened throttle blade. is it the stock TB?

 

[jstreet0204]

There is a mod called the "copper cap mod" or called the "IAC restrictor plate mod". Try a search for those phrases...

That mod is a "Jerry rig" for those that find it annoying that the eec is programed to drop rpms slowly. Sticking idle is a different problem all together and doing this mod only stands to complicate things until he get the original problem fixed.

 

[jt98boost]

Yes, I have a bbk twin 65mm throttle body, this also has a vortech supercharger any ideas?

 

[Kilgore Trout]

Yeah, well... Can't always be right