I own a 2000 jeep grand cherooke v8 4.7 l ive been driving it 4 a year i think logo time ago the check gage light came on and the oil pressure used to go down while i was warming up but oil level was good,it stop doing it and then suddenlywould do it with out any major problem,last week i chane the oil and after it the ol pressure goes down if im driving it while i stop then the check gage ligth komes on an i press on the gas and it komoe up to normal engine runs good and everything works it does that every once in a while what coul it be??? im kind of gettin worried about it:S
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Either the oil level is very low or the engine bearings have failed (assuming the gauge is accurate) if the engine isn't making noise and the level is full have a mechanical gauge installed to check actual pressure. if good, the sending unit or gauge is faulty. If in doubt, do not drive or run the engine 'tll the problem has been diagnosed.
Have either autozone or auto discount...depending on your location, they will check it for free an tell you what the problem is.. they can reset it..however it will continue to come on until the problem is resovled
You probably recently had a new key made, and the Jeep ignition is chipped. The key has a sensor, and must be programmed to match the ignition. Some will start till you put it in gear, then it shuts off.
check the fuel pump fuse/relay, could be just bad enough to cause an intermittent start/no start. and check fuel pressure,spark and the crank position sensor.
have a 2000 jeep grand cherokee with 84,000 miles. started having issues with oil pressure gauge going crazy up and down, beeping. had oil pump replaced per mechanics recommendation. didn't help won't hold pressure---only registers about 2. now they tell me i need a new motor!!! just bought vehicle less than 1 yr ago...had carfax clean report!!!!any suggestions?
if pressure is higher than what it normally is after an oil change, you may have used the wrong grade of oil (too thick). Foam could be from overfilling, or from water in the oil (maybe antifreeze getting into the oil?).
It could be worn camshaft bearings that is lowering your oil pressure. I had the same situation with my 2000 Jeep Cherokee 6 cyl. Changing the oil pressure sending unit did not make a difference. I used a higher viscosity oil and that prolonged the life for almost another year. If you put an oil pressure gauge on it and let it run at a prolonged normal temperature, it will give you a definite answer wheter or not the engine has low oil pressure. The real problem is finding the cause. Camshaft bearings are a likely source. According to the spec book, the I-6 engine had low oil pressure numbers to begin with.
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