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No oil pressure Engine is knocking - 2003 GMC Sierra 2500HD

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Sounds like the oil pump is out..

Posted on Dec 12, 2009

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check your oil level, color, and smell. My guess is that the low oil pressure light is on because of literal lack of oil to pressurize. Generally when you get that light and a knock it points to major engine repair or replacing the engine. Knocks due to oil pressure can indicate many things from a bad head gasket to a stretched rod or blown piston rings. Check your coolant reservoir for signs of oil entering the cooling system as it will float on top of the coolant. By the sound of it it needs major mechanical repairs

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Dosent sound good. Oil light on means you lost oil pressure. and the knocking sound is the damage done due to low pressure. Start looking for another engine or another van.

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Car is knocking and was low on oil cold it be the knock sensor out no oiland water mix in the oil


did the oil light come on? it it did that means a low pressure situation which can cause con rod bearing damage. the knock sensor can cause that too.

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1995 Ford Windstar Engine Knocking at startup. Driven 2800 miles since last oil/filter change. Oil level SAT, Coolant level SAT and no visible leakage. Engine completely rebuilt 2 years ago. Engine has...


No if the oil light has flickered you have oil pressure loss some time just belive the sensor do help us out. lifter do not cause oil pressure loss pressure is built in the rotation of the crankshaft. The knock under the plenum will point you to that cylinder that is affected, (main bearing) as for a 1995 the injectors can only cause a misfire but no knocking noise,will they honor the warranty

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Engine knock hard over 2500 rpm


Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

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the knock sensors are located below the intake plenum,or,upper intake manifold as some call it, they screw into the lower intake, the front one is sensor 1, the rear is sensor 2. it is wise to change both if you have some miles.since you are going to be buying a gasket set to do this job.the sensors are cheaper than the gaskets.

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The first thing I would do is change the oil filter. Also, what engine do you have.

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To accurately check oil pressure, you need a mechanical pressure gauge and feed line. To use, remove the factory pressure sending unit and attach gauge.
Likely if the engine is already knocking, the problem is already there and the oil pressure light is telling you that (knock is either rod bearing, main bearing or lifter) Oil pumps do not generally fail. the pump gets oil before any other component is the last to not get oil. Pressure loss at a worn bearing causes pressure drop that turns on light (unless you don't have sufficient oil in the pan.)

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