What would cause my oil pressure to go up and down?

Nicolas Lovell

Asked by Oct 13, 2011 at 12:56 AM about the 1995 Jeep Grand Cherokee

Question type: Maintenance & Repair

When im stopped the pressure is low but when i driving the pressure is normal or just below normal. I have a 95 JGC with the 4.0 I6.

7 Answers

Matt Mankinen

It's normal for your oil pressure to be lower when stopped. Check your car specs for values. But typically the range would be 40-60. Also oil pressure sensor wear out with time, so either test it's volt or resistance values or install a new one.

1 out of 1 people think this is helpful.
Matt Mankinen

Sorry about that I was thinking of the V8. The I6 (on further review) should be at stop/curb idle: 13 psi minimum @1600 rpm & above: 37-75 psi. Higher or lower you would want to check your oil and coolant level. Being low on coolant (once engine warmed) will effect oil pressure. Form what I understand 89-90 I6 Cherokees at oil pump problems at 140-150k miles. Though you have a Grand so it wouldn't apply.

1 out of 1 people think this is helpful.
Nicolas Lovell

It does have almost 300k miles on it. Could the oil pump be going bad? It started doing it alittle over a month ago.

2 out of 2 people think this is helpful.
Matt Mankinen

Yes with that many miles, I would definitely replace the oil pump. Because if that goes out you'll have a seized engine in no time. If you want to take it a step further, replace your con-rod bearings and piston rings or just run a thicker rated oil.

Biggy Process

when i keep on the gas the oil pressure stays on 30 but when i come to a complete stop it drops to the 2nd white mark by the red line it stays there intell i get going again how do i stop that from happening

12 out of 12 people think this is helpful.

are you using 10w30 oil? This is what ALL 4.0 engines should use.

3 out of 3 people think this is helpful.

Driving home from work today my 2003 Cherokee Check Engine Light went on and the gauge is pointed on low exactly. I called my father and he started freaking out because he said my engine might blow, over heat. Is something wrong with my engine or is my gauge bad? Mine is not going up and down after i start it or am not driving. Mine is at the low gauge level at all times with check engine light. any kind of input would be awesome

11 out of 11 people think this is helpful.

Your Answer

Add photo

Related Questions

Grand Cherokee

Looking for a Used Grand Cherokee in your area?

CarGurus has 73,836 nationwide Grand Cherokee listings starting at $1,200.


Search Jeep Grand Cherokee Questions

Jeep Grand Cherokee Experts

#1 inuevafreak
Reputation 1,770
#2 Tom Demyan
Tom Demyan
Reputation 1,600
#3 thejeepdoctor
Reputation 1,470
View All

Related Models For Sale

Used Jeep Cherokee"
364 Great Deals out of 52,951 listings starting at $2,495
Used Jeep Wrangler"
434 Great Deals out of 16,203 listings starting at $2,395
Used Ford Explorer"
1,317 Great Deals out of 70,885 listings starting at $985
Used Toyota 4Runner"
383 Great Deals out of 18,433 listings starting at $2,400
Used Chevrolet Tahoe"
1,070 Great Deals out of 36,524 listings starting at $1,695
Used Ford F-150"
3,146 Great Deals out of 215,349 listings starting at $1,000

Used Cars For Sale

2017 Jeep Grand Cherokee For Sale
24,782 listings starting at $25,690
2016 Jeep Grand Cherokee For Sale
15 Great Deals out of 18,822 listings starting at $23,495
2015 Jeep Grand Cherokee For Sale
216 Great Deals out of 5,969 listings starting at $20,333
2014 Jeep Grand Cherokee For Sale
319 Great Deals out of 6,466 listings starting at $15,995
2013 Jeep Grand Cherokee For Sale
92 Great Deals out of 1,973 listings starting at $13,500