Mechanics

IDLES FINE TILL 1500 RPM

1997 Jeep Laredo

Engine Performance problem
1997 Jeep Laredo 6 cyl Two Wheel Drive Automatic 170000 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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Johnny 3524
July 11, 2009.




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:

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

Let me know what you find.



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