Question about 2003 Jeep Grand Cherokee
You can generally find the info you are looking for in most inexpensive manuals such as chilton or haynes, available at most larger parts stores. Be aware though that most low oil pressure conditions are not caused by the pump, but by worn main or rod bearings that allow pressure bleed off.
Sometimes it's caused by hard carbon residue stuck to the pump pickup. Either way, you need to remove the engine oil pan to check those things. When checking bearings, always re-torque them to proper specs or you will induce a failure even if there was no problem there..
Posted on Mar 17, 2011
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Posted on Jan 02, 2017
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