Low Oil Pressure
Oil Pressure Very Low on Jeep Grand Cherokee Q:My Vehicle is 1996 Jeep Grand Cherokee with a 5.2 liter engine and the oil pump failed on vacation. The mechanic replaced the main, rod bearings, seal and oil pump. Now when the engine is started cold the oil pressure is fine. After warming up the idling oil pressure is 20 PSI and drops to just above zero when placed into gear. When the Jeep is moving down the road, the oil pressure is 20-30 PSI. A: I’m concerned a bit with your oil pressure readings. The first thing you should do is have a mechanical oil pressure gauge installed and check the readings to confirm that the dash display is accurate If the mechanical reading is the same as the dash gauge readings then you have problems, and here is where I have a problem. Why were the rod and main bearings replaced? The likely answer is because they were damaged. If they were damaged what did the surface that they rode against look like? I’ll tell you right now, damaged! If a...