jeep oil pressure

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pooteo - 22 Feb 2006 01:03 GMT

hello,
i have a question i have found to be answered on this news group, but
never specificaly to my jeep.
i have a 2000 jeep grand cherokee V-8 5.2L all wheel drive.70,000 miles
just recently the oil pressure started dropping.
when driving, the pressure is fine but when at a light or in park it
drops to just above zero and the light comes on.if you put it in
nuetrel or park and rev the engine the pressure goes up and down with
the engine rpm's
bu this doesn't always happen, sometimes the pressure stays fine,
anyone have any ideas, i am going to florida on friday.
thanks
Joe

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DougW - 22 Feb 2006 01:40 GMT

pooteo did pass the time by typing:

> hello,
> i have a question i have found to be answered on this news group, but
[quoted text clipped - 7 lines]
> bu this doesn't always happen, sometimes the pressure stays fine,
> anyone have any ideas, i am going to florida on friday.

Hard to say, 0 indicates a short in the wire or sender, but with
low pressure I have to hedge my bets. i.e. if it was reading 80
(which is impossible) it is almost always the sender.

My feeling is you have a bad sender, but you would be better off
putting a gauge on the fitting and checking at the block.

True 0 is a sign of oil pump failure and beleive me if oil pressure
acually went to 0 for a while you would hear it. 0 psi = no oil for
the lifters = clackey clackety clackety..etc.. :)

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DougW

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Danny - 22 Feb 2006 09:36 GMT

> hello,
> i have a question i have found to be answered on this news group, but
[quoted text clipped - 9 lines]
> thanks
> Joe

You may have low pressure when the engine is hot and at idle due to
thin/worn oil. When is the last time it had an oil & filter change
and what viscosity oil are you using? You say it occurs at different
times - do the symptoms appear after any journey, or just after a long
journey (say 30 miles or more, when the oil may be hotter)

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Regards,
Danny

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philthy - 23 Feb 2006 21:32 GMT

i hope u are not taking that until the pressure is checked with a gauge it
could be serious

> hello,
> i have a question i have found to be answered on this news group, but
[quoted text clipped - 9 lines]
> thanks
> Joe

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larry - 23 Feb 2006 22:02 GMT

I agree, it would be foolish to say the least to take your jeep on a
trip without having your dealer check it out. Whatever the cause, it
should get diagnoised and fixed before your trip.

Larry

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Rich Pierson - 27 Feb 2006 23:32 GMT

> I agree, it would be foolish to say the least to take your jeep on a
> trip without having your dealer check it out. Whatever the cause, it
> should get diagnoised and fixed before your trip.
>
> Larry

Aluminum oil pumps, get it replaced with a good steel one. Known problem.
Reference jasper.com, the engine builders, they make mention of it.

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