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Oil pressure jumping Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting zmasterflex User Oct 23, 2010, 5:54 PM Post #1 of 5 (6851 views) Oil pressure jumping Sign In Hi all. 1996 Jeep Cherokee 54k miles 4.0 4x4. While driving on the highway recently the needle on the oil pressure gauge started jumping wildly. it bounced up and down between 40 and off the scale. I pulled over and checked the oil level, it was fine. There were some bubbles on the stick but i closely studied it and it wasn't the white frothy bubbling I've seen with a blown headgasket, just a few small oil bubbles near the top. There was nothing leaking and it was a sudden jumping so I continued on my way. Now when I drive locally, sometimes the needle stays consistent and sometimes it jumps when I hit the accelerator (like the RPM gauge). A few questions. What causes the oil pressure to be higher or lower? If oil pressure is so important why don't newer cars have oil pressure gauges? How do I tell if my jumping needle is due to a pressure problem or some electronic malfunction? This car has really low mileage I dont want to wreck it. thanks Hammer Time Ultimate Carjunky / Moderator Oct 23, 2010, 6:02 PM Post #2 of 5 (6841 views) Re: Oil pressure jumping Sign In That's what you have to test for. The cheapest way to find out is to just replace the sender. You can use a mannual gauge to test the pressure but the time it would take would cost more that just throwing a new sender into it. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. zmasterflex User Oct 26, 2010, 2:25 PM Post #3 of 5 (6826 views) Re: Oil pressure jumping Sign In I replaced the sender and now the needle is stuck all the way up, off the chart. I at one point guessed that maybe there was some sludge stuck near the sender causing it to go haywire so I ran the jeep with mystery oil for 10 minutes then changed the oil. The old oil looked fine, I changed it 3500 miles ago. It was suggested that when the needle went haywire It might have messed up the calibration on the gauge. I don't have any other ideas. thanks for any further advice Hammer Time Ultimate Carjunky / Moderator Oct 26, 2010, 2:37 PM Post #4 of 5 (6824 views) Re: Oil pressure jumping Sign In What happens to the gauge when you unplug the sender? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. zmasterflex User Oct 29, 2010, 3:36 AM Post #5 of 5 (6812 views) Re: Oil pressure jumping Sign In stays the same with the sender unplugged. the needle is screwed up. I guess I just need to change the gauge or put in an aftermarket one. thanks for the help   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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