1. You need to have an independent oil pressure gauge hooked up to the engine to check the oil pressures at various RPMs and to verify the 40 to zero drop. This will eliminate any issue with the pressure gauge or the sending unit.
2. The oil pressure variation can be caused by an intermittent blockage in the oil pick up or an intermittent sticking oil pressure relief valve. I would possibly suspect the latter if you are getting good pressure and it is intermittently dropping to zero and going back up again..
If you or previous owners have not maintained the engine with frequent oil changes you will get a sludge build up problem in the engine and this will be evident by just dropping the engine sump.
3. If you have had a check engine light warning then you need to have the vehicle scanned to see what fault codes have been generated by the computer. There will be some related to the intermittent loss of oil pressure but there may be others also..
4. You need to have the oil pressure problem checked out immediately. Running the engine when you constantly lose oil pressure intermittently will definitely cause engine damage due to a loss of both lubrication and oil cooling to critical components.
SOURCE: Come to stop 99 Ram oil pressure drops to 0 check gauges light.
Change the oil! The 318Cu in V8 (5.2 liter) engine has a problem with sludge build up on the oil pump pickup tube screen. This engine requires oil changes at or before 3500 miles with a high detergent oil.
SOURCE: I have a 2002 dodge ram 1500 w 176,000 + miles.
Well Check your oil preshure with a proper gauge!
may have not sufisiant oil preshuire!!! or it might just be a faulty preshure senser!
Better that than defective oil pump! use caution as insefitient oil preshure will lead to ireprable engine dammage!!!!!
Have a good one .Bruce.
SOURCE: 2004 Dodge Ram 1500 5.7L at start up check gauge
Sounds like the oil pressure sending unit needs replaced.
SOURCE: "Check your gauges" light come on when I come to a
you are low on oil in the engine- brake hard and watch the pressure gauge it will drop also---you are at least 3 qt's low.
SOURCE: Gauges work fine when engine's started, then oil
start by checking the ground strap to the engine, and engine to body. The oil pressure sender unit may be bad. You may have to hook up an oil pressure gauge to the oil pressure sender port to verify proper oil pressure. Senders are cheap- I would just replace it and go from there.
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