Question about 2000 Jeep Grand Cherokee

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Oil pressure gage

When jeep is idle or going under 20 miles per hour gage goes from 40 psi to 0 psi

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  • boltster Apr 02, 2009

    Same problem, 2000 Cherokee Sport w/4.0L engine. Cold engine, oil pressure at 45-50 psi, as engine warms pressure drops. When engine is fully warmed up, oil pressure gauge acts like a tachometer...higher during acceleration, and drops to 10 psi +/- at engine idle. Just started doing this 3-4 weeks ago.

    Also have been experiencing coolant loss for the past 2-3 months. I drive approximately 300 miles per week, and have been adding 1/2 gallon of 50/50 mix to overflow bottle every 2 weeks. No apparent leak, and no sigh of coolant in crankcase. Have occasionaly smelled coolant in the car...possible heater core leak?

  • lex_88 May 17, 2009

    i hahe the same problem but the costumer is telling me that he has changed the engine . I coll the tech that change the engine he cleen te pick up but did not change the seel and i got 10 psi on idel and 70 on the highway.

  • Anonymous Mar 30, 2014

    engine idles rough and does not go over 40 miles per hour

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At idle, at operating temp is there any ticking from top end of engine? Are there any knocking noises brom bottom end?
If no noises, change oil and add some Marvel oil to clean out galleys. If that dosent work, change oil pressure sendingf unit. Also, if you have a mechanical oil pressure gauge, hook it up and take a direct reading. Oil pressure (in any vehicle) at idle should NEVER be less than 15psi. Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60! (but, you did not mention what engine you have)

Posted on Dec 28, 2008

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The same problem but the costumer is telling me that he has changed the engine . I coll the tech that change the engine he cleen te pick up but did not change the seel and i got 10 psi on idel and 70 on the highway.

Posted on May 17, 2009

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