jeep oil pressure
 

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

Re: jeep oil pressure
 

pooteo did pass the time by typing:
> 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.

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.. :)

--
DougW

Re: jeep oil pressure
 

pooteo did pass the time by typing:
> 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.

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.. :)

--
DougW

Re: jeep oil pressure
 

pooteo did pass the time by typing:
> 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.

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.. :)

--
DougW

Re: jeep oil pressure
 

pooteo did pass the time by typing:
> 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.

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.. :)

--
DougW

Re: jeep oil pressure
 

pooteo wrote:
> 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
>

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)

--
Regards,
Danny

http://www.gaggia-espresso.com (a purely hobby site)
http://www.dannyscoffee.com (UK advert for my mobile espresso service)
http://www.malabargold.co.uk (UK/European online ordering for Malabar
Gold blend)
swap Z for above characters in email address to reply

Re: jeep oil pressure
 

pooteo wrote:
> 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
>

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)

--
Regards,
Danny

http://www.gaggia-espresso.com (a purely hobby site)
http://www.dannyscoffee.com (UK advert for my mobile espresso service)
http://www.malabargold.co.uk (UK/European online ordering for Malabar
Gold blend)
swap Z for above characters in email address to reply

Re: jeep oil pressure
 

pooteo wrote:
> 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
>

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)

--
Regards,
Danny

http://www.gaggia-espresso.com (a purely hobby site)
http://www.dannyscoffee.com (UK advert for my mobile espresso service)
http://www.malabargold.co.uk (UK/European online ordering for Malabar
Gold blend)
swap Z for above characters in email address to reply

Re: jeep oil pressure
 

pooteo wrote:
> 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
>

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)

--
Regards,
Danny

http://www.gaggia-espresso.com (a purely hobby site)
http://www.dannyscoffee.com (UK advert for my mobile espresso service)
http://www.malabargold.co.uk (UK/European online ordering for Malabar
Gold blend)
swap Z for above characters in email address to reply

Re: jeep oil pressure
 

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

pooteo wrote:

> 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