OIL PRESSURE DROPPED from 40 to 0 slowly at idle
01-30-2011, 02:01 AM
#16
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Year: 98
Model: Cherokee
Engine: 4.0
I have a 2002 jeep grand cherokee limited 4.7L v8.. I drove it out to the store today and I put it up in park and my oil pressure slowly dropped from 40 to 0 and my check gauges light came on.. I checked my oil and it was low so I put some in.. It was still reading 0 pressure! But as long as Im giving it gas my oil pressure goes back up to 40.. I got it home and let it idle and the gauge jumps back and forth 0-40.. someone HELP ME! this is my only vehicle I have!!!!!! 
So you JUST bought the Jeep?
01-30-2011, 03:05 AM
#17
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No I have had my Jeep for a year and 2 months now. It has 156,000 miles on it..
Last edited by JeepGrand Cherokee Girl; 01-30-2011 at 04:14 AM. Reason: Hit the wrong number key
01-30-2011, 03:06 AM
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Would it be Okay to drive my jeep the way its doing??? Because I have no way to work LOL & does my Jeep have 2 oil pressure sensors???
01-30-2011, 03:26 AM
#19
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No you have the sending unit and the gauge.
Its most likely the oil psi sending unit but check your oil level before you drive. 0psi is a scary thing to see or hear. Its located next to the oil filter. You may need to remove the filter for easy access. I believe you'll need a 27mm deep socket. If you're off on Sunday go to the parts store and get a sending unit.
Its most likely the oil psi sending unit but check your oil level before you drive. 0psi is a scary thing to see or hear. Its located next to the oil filter. You may need to remove the filter for easy access. I believe you'll need a 27mm deep socket. If you're off on Sunday go to the parts store and get a sending unit.
01-30-2011, 04:14 AM
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ohhhh okay... sorry wrong mileage it has 156,000 miles lol oops my bad. but yeah um i will get the sending unit and what not.. oil change and new filter.. there is oil in it i put some in it yesterday.
01-30-2011, 07:03 AM
#21
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Year: 1990 - 2000
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Engine: 4.0
Do your Jeep justice and keep the oil level between the max and min lines on the dipstick. Also change the oil and filter every 3000-5000 miles depending on driving conditions or every 6 months whichever comes first. My stepson let his oil get low and old, and now his 130,xxx mile Jeep has almost no oil pressure at idle when it is at operating temp. Mine has 234,xxx miles and has 20 PSI at idle hot.
01-30-2011, 07:16 AM
#22
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Year: 1991
Model: Cherokee
Engine: 4.0 HO
Haha the guys at pepboys said my head gasket was cracked, was seeping oil, and was causing my low oil pressure. Well the oil was because they over tightened my filter the week before when they did my oil, and the sending unit fixed the pressure issue. They also told me it would be 1k$ for an ac compressor change. I know it's a 400$ part new... But ****. Got my mechanic buddy to put in a compressor from a 98 in the junk yard, cleaned and filled it with freon and only cost me 200$. Oh and did I mention the pepboys guy asked me if it was a grand cherokee while we were standing right next to it?? I almost slapped him. Theyre wonderful as a parts store but their service guys dont know ****.
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