2001 Jeep Laredo

Tiny
PANAGURL
  • MEMBER
  • 2001 JEEP GRAND CHEROKEE LAREDO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
My jeep keeps shutting off on me while driving. The idle needle goes crazy and sometimes my car will catch it befor it dies but for the most part it just cuts off on me. I have noticed that it is VERY hot under the hood but my temp gauge reads fine I had a dignostic reading and that too came out fine. I have recently replaced the water pump, fuel filter, and fan clutch but I am still over looking my problem, im stuck! Can anyone PLEASE direct me to my cars malfunction?
Sunday, July 6th, 2008 AT 9:18 AM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi PANAGURL,

When the idling rpm meter goes crazy, does the engine also follow suit or is it quite stable?
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Sunday, July 6th, 2008 AT 9:46 AM
Tiny
PANAGURL
  • MEMBER
  • 18 POSTS
Sorry fallow suit meaning? Does it seem to run rough? If thats the question then yes. Ive noticed I have lost alot of power as well I feel as though I need to press on the gas more just to get the same power as back when. Any thoughts?
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Sunday, July 6th, 2008 AT 10:08 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi PANAGURL,

Yes, so the idling is hunting.

There are a few possibilities.

1. Misfiring due to spark plugs or related parts.
2. Injectors.
3. Vacumn leakages
4. Throttle position sensor
5. MAF

Since diagnostic shows no fault, I would check the plugs and related parts first.
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Sunday, July 6th, 2008 AT 10:22 AM
Tiny
PANAGURL
  • MEMBER
  • 18 POSTS
I thought that the spark plugs where basically only there for the initial crack start? Bad spark plugs can cause the car to shut down? And what is a maf? And how do I check for vacumm leaks?
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Sunday, July 6th, 2008 AT 1:51 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi PANAGURL,

The spark plugs are the live wire of the engine, without them running properly you would not be able to drive off.

Bad plugs would cause misfiring and send the wrong signal to the ECM causing it to shut down.

Look for small hoses attached to the inlet hose and manifold that are craked, broken or detached, if any they would cause vacumn leakages.
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Monday, July 7th, 2008 AT 8:24 AM

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