Way Outta Control
Join Date: Sep 1999
Location: The Palouse
Thanked 3 Times in 3 Posts
Re: JEEP IDELS AT 2000 RPMs--Update! It\'s Fixed!
This has been an interesting post. As I read it I found that there wasn't really enough information to give a good diagnisis.
An Idle Control Circuit will vary with load, temp, volume of air being sucked in, etc.
Here we've got some variables:
1. The Idle appears constant.
2. There's a swap of parts afoot.
3. There's no specs for the idle of either of the parts.
My rule of thumb is that if the Idle Control circuit is steady... it's not a vacuum/air leak screwing up the computer.
Most Idle circuits will have some sort of "rest" position for the throttle plate in the throttle body housing. It may be capped, hidden or just plain seald off with goop, but usually it's there.
Also in EFI circuits the idle is "pre-set" per the IAC/IAS sensor and the throttle plate rest position.
You may have just lucked out by closing off the throttle plate.
My guess is that there is a specific sequence of events that must be made to accuractley set the idle, rather than just backing off the throttle plate.
But, I could be wrong... I have been before. Anyone want to chime in on this? [img]images/graemlins/confused.gif[/img]