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Posted on Jan 02, 2017
You may not have put the right amount of oil in your car, your oil pressure sensor could be faulty, or you may have a leak.
By revving your engine, you're increasing the pressure and thus turning off the light and making the sensor think that it's at the correct pressure.
Posted on Sep 08, 2009
If your vehicle was purchased in the USA, it is against federal law for a dealer to sell it without a cat. If you are somewhere else, I have no idea what laws are. I have no idea what "cruising with the clutch" means.
Your oil pressure dropping may only show that at the same time the engine has stalled or is turning so slow that you are not making enough oil pressure. I would check the throttle position sensor, map sensor and idle air control valve for proper readings and operation, also check for minor vacuum leaks. It seems that your idle is too low and allowing the engine to stall. There are other things that can cause this besides what I mentioned but those are the main ones I'd check first. Testing can be done with a decent multi meter and using a chiltons or haynes manual as a guide.
Control systems need testing to get a proper diagnosis...That's one thing I can't do from here.
Do the testing and likely you will find the problem. Many larger parts stores will do a free code scan...that too is helpful.
Posted on Oct 04, 2009
This same thing happened to me it was the oil sending unit that needed to be replaced. It's an easy fix but you have to take off the heat shield to get to it.
Posted on Nov 05, 2009
Well there are quite a few things that casue a "surge" in a common rail diesel. You will need to check injector flow rates (scanner only). Fuel pressure regulator for pulsing (scanner only). Supply side fuel system for air leaks (seeing if it is sucking air into the system).
My bet would be the injectors, because you say the rpms aren't going up and down, which is usally what happens when the regulator goes bad, and when you **** air into the supply they have an extended crank. Report back with your findings.
Posted on Nov 24, 2009
Before you spend money on a new gauge. Get an oil pressure testing gauge for $20 , remove the oil pressure sending unit and test the oil pressure. If oil pressure at idle and 3000 rpm's is a-ok via spec's ( big money repair items) then its either the gauge a clogged or defective sending unit or the circuitry. (little money repair items)
You can also have this done at a repair shop.
Posted on Apr 26, 2010
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