Question about 2000 Jeep Grand Cherokee
I have a 2000 Jeep grand Cherokee-My oil pressure gauge read low and the check engine light came on-I was over a few miles on my oil change so got it changed. Will this solve my problem or do I need to get the oil pump changed and the oil pan replaced and valves done like the person who changed my oil claimed? Since the oil change I have only driven the car about a mile so I do not know if my problem is solved and hate to drive the car if it is not.
Low oil pressure is generally caused by internal engine bearing wear, not a "bad" oil pump... Pumps become "bad" when debris from a failed component gets into it, causing damage. (exception being pressure regulator spring/plunger assembly becoming clogged with gunk in engines that do not get proper maintenance; likely not your case)
Were there any tapping noises coming from engine when pressure was low? If not, The most common problem is the pressure sending unit, sending bad info to the warning light. If passage going to it or internal passage is gunked up, this problem usually disappears when oil is changed. sometimes the sender just goes bad, in which case, change it.
To get a proper diagnosis on your problem, have someone put a mechanical oil pressure gauge on it. This will read the actual oil pressure and will tell you a lot about the condition of your engine!
I have never seen a valve job that corrected any oil pressure problem. I mistrust anyone who would even think that!!!
Mlinimum low pressure at idle is 15 psi Max is about 60psi running (higher can explode an oil filter) A reading of 15psi indicates the beginning of a problem. although considered "safe" it is not good.
Posted on Jan 03, 2009
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