Car Tech forum

General discussion

98 Grand Cherokee..... running rough

by jcjjbart / August 12, 2007 1:47 PM PDT

We have a 98 Grand Cherokee Laredo 4.0. The vehicle was just perfect has only 60k miles.
When started cold, or after it sits for about 20 minutes hot, and is restarted, the idle rolls high and low to a point where it almost stalls, which it has a few times. Once it clears up, it runs fine.
If it is started cold, or again hot after sitting, and you attempt to drive, the engine just seems to cut out, and will pop back thru the air-box. It will not completely stall, but loose all power, then run fine.
So far we have done a complete tune up, fuel pump, battery, idle control switch, map sensor, coolant temp sensor, cam sensor, coil, crank sensor. It does not throw any codes, and runs fine after it's little hissy fit.
Any ideas, sugguestions would be greatly appreciated

Post a reply
Discussion is locked
You are posting a reply to: 98 Grand Cherokee..... running rough
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: 98 Grand Cherokee..... running rough
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Collapse -
98 grand cherokee - same problem
by 98JGCL40 / February 8, 2009 5:32 AM PST

Any news on this problem? My 98 Jeep grand cherokee is doing the exact same thing. I found that turning the key off and on while its happening clears the problem but obviously I'd still like to know the cause.

Collapse -
98 Grand Cherokee..... running rough
by dakota5605 / August 4, 2010 2:00 AM PDT

Can anyone help us my 98 cherokee is doing the same thing, I have done complete tune-up, ran lucas fuel injector cleaner through, checked fuel pressure (another forum said it was my fuel pump) and cleaned the throttle body and replaced the TPS. My next move is to change the idle air motor/valve?

Collapse -
running rough
by badcherokee / November 2, 2010 10:18 AM PDT

change your air fillter clean out the air box and tube remove throdel body clean it very well with TB cleaner not carb cleaner buy Map sensor cleaner $7.00 clean map sensor..
with the throdel body off clean the intake as well as you can. also replace the air intake
sensor its only $19 very easy to do all of this it makes a huge improvement.

Popular Forums
Computer Help 49,613 discussions
Computer Newbies 10,349 discussions
Laptops 19,436 discussions
Security 30,426 discussions
TVs & Home Theaters 20,308 discussions
Windows 10 360 discussions
Phones 15,802 discussions
Windows 7 7,351 discussions
Networking & Wireless 14,641 discussions

CNET Holiday Gift Guide

Looking for great gifts under $100?

Trendy tech gifts don't require a hefty price tag. Choose from these CNET-recommended useful and high-quality gadgets.