Question about 2004 Chevrolet Express

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Should the oil pressure gauge fluctuate with speed

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The oil pressure guage will fluctuate with engine RPM. At idle it should be approximately 20 lbs./sq.in, at high revs about 50-60 lbs./sq.in. Hope this helps any concerns you may have. Good luck!

Posted on Jun 05, 2010

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It will fluctuate with engine speed. It will read lower at idle and go up as you accelerate.



Posted on Jun 05, 2010

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Posted on Jan 02, 2017

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SOURCE: Oil Pressure Gauge is fluctuating.

center back of motor behind distributor..bulbous

Posted on Dec 08, 2008

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SOURCE: Fluctuating oil pressure gauge.

Two quarts is about half the capacity. The pump was probably starved of lubrication and is failing.

If that's not expensive enough, you may now have a problem with a damaged engine. You may want to just put that money into a new vehicle.

I don't think the car would have enough power in its present condition to get high enough to reach a cliff, and driving it into a lake would not be environmentally sound. Besides, the fine would not be worth it.

The cheapest and easiest maintainance that anyone can do on a car to avoid expensive repairs is still checking the oil ever 1000 miles (filling if necessary!) and changing it every 3000.

Posted on Mar 18, 2009

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SOURCE: 2001 2500hd duramax idle surge. doesn't do it all

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

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1 Answer

My oil gauge is going back and forth on my 1996 Ford F250, I have change the oil coolant sensor. When I drive a few miles the oil gauge goes crazy. Need help? I have change the oil sending unit also.


The oil temperature sensor could be in the oil level sender unit - it depends how many connecting wires there are. If it is in there it would not be as accurate as if it is placed in the main oil gallery, perhaps combined with the oil pressure sensor.

I advise you to re-read your vehicle handbook and ensure you know the exact functions of the instruments. Often the oil gauge is a level gauge only until the engine is started and then becomes an oil pressure gauge, therefore a fluctuating gauge might indicate a fluctuating oil pressure...

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Use a pressure test gauge to verify the pressure fluctuations at idle. It could be just a malfunctioning sender. If the pressure is, in fact, fluctuating then the pressure regulator is going bad. It is part of the pump so a new pump will solve the problem.

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If you want to pursue it, remove the oil pressure sending unit and perform an oil pressure test with a mechanical gauge. If the mechanical gauge fluctuates the same way, suspect a worn or failing oil pump. If the gauge is stable, I would suspect a faulty oil pressure sending unit.
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I've had sender replace and all points between there and oil gauge verified OK and all the stepper motors on instrument cluster replaced but still get fluctuating oil pressure needle and warning s


If you check the oil pressure with a mechanical gauge and the pressure is steady, the problem would be in the gauge on the dash if you have replaced the sending unit and there are no problems with the circuit.
The mechanical gauge could verify a problem with the actual pressure in the engine.

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Sounds to me like it could be a bad oil sending unit or gauge. I would take it in to a shop and have them test the oil pressure with their equipment.
If they tell you the pressure is good try changing the oil sending unit first then if that don't work, replace the gauge.

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Oil gauge fluctuates back and forth. sometimes


You'll need to determine if the oil pressure is actually changing, or if the sending unit or gauge is lying to you. Be certain the oil level is up to normal, then check the actual oil pressure with a test gauge. If the pressure varies (drops) at engine idle, perhaps your pressure bypass is defective, or perhaps the oil pump is worn. Testing with a known good pressure gauge should lead you in the right direction.

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DIAL IN CAB COULD BE AT FAULT, NEED TO GET ANOTHER DAIL GUAGE AND CONNECT TO SENDER, IF SAME COULD BE SENDER, IF STILL THE SAME, PRESSURE VALVE IN BLOCK STICKING DUE TO DIRT OR U/S, OR AT WORSE !!! ENGINE WORN, THIS WILL BE CONSTANT IN MOST CASES, FAULT IN GUAGES ARE NORM INTERMITANT.
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Fluctuation on the oil pressure gauge reading


The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

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