Idle low?

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Feb 27, 2019 | 12:11 PM

johnston

Thread Starter

Newbie

Joined: Feb 2019

Posts: 14

Likes: 0

Model: Cherokee (XJ)

Idle low?

I have a 89 Jeep Cherokee limited 4.0 and my idle is low I’m not to sure what it is also when I apply the brakes the idle drops to probably 250-350 and the radio goes out happens especially when the lights and heater are on I don’t know what to do any help please

Feb 27, 2019 | 02:36 PM

tech

CF Veteran

Joined: Jun 2016

Posts: 2,138

Likes: 278

From: Santa Clarita California

Year: 2001

Model: Cherokee (XJ)

Engine: 4.0L

Have you checked the idle control motor ? and for the radio going out hows the charging system ? is the voltage dropping low ?

Feb 27, 2019 | 02:41 PM

gat

Senior Member

Joined: Mar 2016

Posts: 621

Likes: 9

From: Oklahoma

Year: 1992

Model: Cherokee

Engine: 4.0L L6 PowerTech (stock)

Idle...
I'd clean the idle air intake and the valve around it. I believe that idle is adjustable on that Renix.
Idle and radio...
Clean grounds, check the voltage on battery before started and after starting. Check the voltage with the heater on et cetera. Post those results.

Feb 27, 2019 | 05:39 PM

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,839

Likes: 116

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

You have an 89 XJ, which is a RENIX.

Below is a link to a website that you should absolutely bookmark. Read through it. Perform the tips that Cruiser recommends. He knows his stuff when it comes to your vintage.

http://cruiser54.com/