Mechanics

ENGINE MISS

2004 Jeep Liberty

Engine Mechanical problem
2004 Jeep Liberty 6 cyl Two Wheel Drive Automatic 108000 miles

I have a 2004 Jeep Liberty with a 3.7 gas motor. It starts, idles and accelerates normally. The problem occurs when the engine is above 2000 rpm and you take your foot off the gas (idle decel). The engine slowly decels and then for a couple seconds, it shudders(shakes) and the rpm rapidly decreases to 600 rpm, then right back to 1700 rpm or so where the IAC is supposed to slowly retard the engine. It does it several times before settling down. If you operate below 2000 rpm, it decels normally. I have replaced the: IAC, TPS, MAP(sensor), CKP(sensor), CAM(sensor) and removed and cleaned the throttle body. The MIL light is not illuminated and have scanned the car with my genisys.
No problems can be found. If you have any suggestions, please advise. Thanks, Don
Avatar
Donradtke
August 15, 2010.




We had a 2002 jeep liberty come into my shop with the same identical problem. We were stumped. No codes all sensors working within parameters. This sounds stupid but we figured it out. Disconnect the serpentine belt then start the engine. I bet the problem will go away. The clutch fan was wasted on ours. Check all the pulleys accesorries etc. The bearings were ready to fall out. Let me know if this helps.

Thanks, rob
tri-county tire and auto service

Tiny
Tricountytire
Sep 12, 2012.


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