What would cause my oil pressure to go up and down?
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.
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.
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.
It does have almost 300k miles on it. Could the oil pump be going bad? It started doing it alittle over a month ago.
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.
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
are you using 10w30 oil? This is what ALL 4.0 engines should use.
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