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1997 Jeep Laredo idles fine till 1500 RPM

Tiny
JOHNNY 3524
  • MEMBER
  • 1997 JEEP GRAND CHEROKEE LAREDO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
The engine willl idle fine till it reaches about 1500 rpms then starts skipping and popping in exhaust so far I have replaced fuel pump, injectors. Spark plugs, wires, distibutor cap, rotor button, map sensor, crank sensor, distibutor, ecm, throttle position senser and nothing has helped. Dealer checked out and says engine may need replacing due to 15 inches of vacume. Any suggestions? Also replaced oxygen sensor and catalytic converter
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Saturday, July 11th, 2009 AT 11:34 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Have you checked closely for vacuu leaks? Also, if the intake vacuum is low, I would recommend doing a compression test. Here is the how to:

https://www.2carpros.com/dia/how_to_check_compression.htm

Let me know what you find.
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Tuesday, August 25th, 2009 AT 11:52 PM

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