Question about 2002 Jeep Grand Cherokee
When engine is warmed up oil gauge drops to low at idle. oil level is within normal range
Posted by Anonymous on
Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts
Posted on Aug 12, 2013
What I would do is this... buy a high volume/high flow oil pump and replace your factory oil pump. This will stop your problem. It will prolong yoir engine life and will get rid of your light coming on. It pushes a lot more oil through the motor. Good luck
Posted on Mar 11, 2015
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Posted on Jan 02, 2017
If the weather in your area is colder than normal, your startup oil pressure will reflect this, essentially because it is much thicker when very cold. This high reading should drop to "normal" once it reaches operating temperature. This condition can also be caused by a sticking pressure relief in the oil pump, usually caused by sludge inside the engine. If you regularly maintain your vehicle and use good quality oil, this should not happen. The oil pressure sending unit is also suspect, but in your case, I would not put it at the front of the list. If oil is close to "change time" consider using a good synthetic oil (synthetics flow better at extreme temps) or using a 5W anything oil during winter months. (see manufacturers specs)
Posted on Jan 23, 2009
Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.
Posted on Jun 07, 2009
The Oil pressure sensor seams to have gone bad and needs to be replaced soon as possible as they tend to leak oil soon after. There common to go bad and start with that since it's easier then replacing the oil pump, but if you don't hear any ticking from the engine and you have good pressure when the engine is cold then it's the sensor.
The 4 cylinder oil pressure switch is located below the A/C compressor. It is a single wire connection with a gray/yellow striped wire.
The 6 cylinder oil pressure switch is located on the passenger side rear of the block. It is a single wire connection with a gray/yellow striped wire.
Good luck and hope this helps.
Posted on Jul 01, 2009
SOURCE: OIL GAUGE GOES DOWN AT STOPS
I had the same problem with my 97 Wrangler 4.0..Change your antifreeze, replace with some new 50/50 mix...Also chanke your oil, replace the filter with a mopar filter and use stratght 30 weight motor oil...Solved my problem
Posted on Jul 10, 2009
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