idles high & runs rich

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Dec 22, 2012 | 11:11 PM

#16

nofords4me

Junior Member

Joined: Jul 2011

Posts: 34

Likes: 0

From: Great Falls, Mt

Year: 1988

Model: Cherokee

Engine: 4.0L

Edit: was going to say CTS because my 88 had a similar issue when mine had a bad ground going to it but after re-reading your first post I see you've already replaced.

Last edited by nofords4me; Dec 22, 2012 at 11:14 PM. Reason: Re-read first post

Dec 23, 2012 | 07:20 AM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Here's a possibility. Did anyone ever turn the screw that adjusts the throttle butterfly?

Cruiser’s Renix Throttle Body Butterfly Adjustment
Okay. Let's start from scratch. First off, that's not an idle adjustment screw. It's a throttle butterfly stop screw. It's purpose is to allow the butterfly to be as close to completely closed as it can be without binding or wearing into the throttle body. It was never intended to be adjusted in the field. But, Uncle Bob didn’t know that, did he?

Engine off. Back off the butterfly stop screw with a 3/32" allen wrench until the butterfly is completely closed. Now. turn the screw in until the FAINTEST movement of the butterfly opening is detected. This can be done more easily with the throttle body removed. If you remove the throttle body, be sure to replace the gasket underneath it after thoroughly cleaning the old one off.
Revised 07/07/2012