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That's a big way to go from 1 to 120 on your oil pressure gauge. Something similar is happening with my car. The needle on my gas gauge will hit the middle mark and just drop to empty. I think that we'll both have to get our gauges repaired.https://natcal.com/repairs.htmlThat's a big way to go from 1 to 120 on your oil pressure gauge. Something similar is happening with my car. The needle on my gas gauge will hit the middle mark and just drop to empty. I think that we'll both have to get our gauges repaired. https://natcal.com/repairs.html
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Re: Oil pressure gauge goes from 0 to 120 back and fourth...
It sounds like the pressure sensor is defective and intermittent. Gas gauges will do the same when the resistive element is broken or the wiper is not contacting clean any more.
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The oil light comes on when the oil pressure sensor detects low oil pressure. The amount of oil has little to with it, although very low oil levels can cause loss of oil pressure. The best thing to do is to have the engine's oil pressure checked with a mechanical oil pressure gauge to ensure that the oil pressure is sufficient at all operating speed and temperatures. If the oil light is still flashing on and off and there is no indication of low oil pressure by the gauge, then replacement of the oil pressure sensor is recommended.
Check the plug first. Look at the tabs in the plugs. They should be touching from one side to the other. See a gap fix or replace the plug. If it looks good, Replace the oil sending unit.
Did the mechanic drive the truck with a mechanical gauge to check the pressure ? The engine bearings or oil pump could be worn enough to allow pressure to drop at idle after it warms up.
take it back for a warranty check
could be a spun bearing problem or a simple oil pressure sensor/sender unit
have a oil pressure test done using a mechanical pressure gauge
Two things...when it reads zero, is there any engine noise (tapping or knocking)? After you rev the engine does the pressure read normal at idle and function normally, or does it go back down? Either way, you should not drive the vehicle 'till you have a mechanical gauge (yours is electro-mechanical) put on there and the actual pressure is tested. The condition may be a bad sending unit, a bad bearing or possible obstructed oil pump screen. The repair is obviously different for each one and the price is as well.
If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.
Replace the useless oil pressure sending unit with one from a early year such as 1986 .connect only the wire to the oil light.if you want a pressure gauge install an after market one..The stupid factory sending units can not rear pressure under 40lbs.at less than 40psi the light is on and the gauge reads 0 good luck carl
i was having the same issue with oil pressure and i only had 55K on mine, i have since changed the cat and the exhaust manifold and the problem went away? might be a coiencedance but it makes since thinking like an exhaust brake would work
That's a big way to go from 1 to 120 on your oil pressure gauge. Something similar is happening with my car. The needle on my gas gauge will hit the middle mark and just drop to empty. I think that we'll both have to get our gauges repaired.https://natcal.com/repairs.html
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