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What causes oil pressur and power loss in a v6 2004 vortec

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Have the OBD codes read as may be a sensor(s)/switch or something more complicated this will save time and money as there are a few things that could cause these symptoms keep me posted if you wish

Posted on May 13, 2014

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Posted on Jan 02, 2017

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1 Answer

Engine oil light flashing


Flashing oil light indicates a loss of oil pressure. No oil pressure will cause the engine to seize up. Check the oil level, if full verify that the oil sending unit is connected correctly. Listen for unusual engine noise (Shut down immediately to avoid damage to the engine), connect an oil pressure gauge to the oil sending port (remove sending unit) and verify oil pressure. the issue could be a loose connection, broken connection or plugged sending unit, as well as loss of oil pressure.

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OK my 95 Chevy 1500 2wd 4.3 manual transmission, seems to have a little loss of power it smokes a little out the tail pipe and every time I give it a lot of gas the oil pressure goes down will bottom out...


Yes, it could be connected. If you run an engine with straight pipes, there will be no back pressure from the exhaust system, and the gas flows very fast out of the engine past the exhaust valves. This will cause the valves to heat up more than the manufacturer's spec and could burn the valves.
This in turn will cause loss of power. Overheated valves will cause the valve stem seals to harden and even to disintegrate, causing slight smoking from the tailpipe.
The oil pressure is a sticky toffee. If you have enough oil in the engine, you should have equal pressure at either low or high speed, unless you have a dicey oil pump, or oil level is low, causing the pump to lower the level in the sump or cavitating (sucking in air with the oil).

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Peugeot 308 low oil pressure and loss some power


Low oil pressure starts from oil pump sounds like its blocked either in the pump filter or galleries in the enging. I would first call the dealer and check what filter system is on the pump which may require removal of the sump to replace or clean.

I would certainly not use a car with this problem as it could well cause engine failure. Try a good quality flush first and run the car for 20 minutes minimum on tick over. Remove and put a good quality oil in and do another oil change again if required a month later with a flush to make sure the gunge is out.

If this does not help do an oil pressure test and see what it comes out at checking the manufacturers recommended pressures. If you have changed the oil, pump filters and done a second oil change and still get low pressure then you may well have a faulty pump.

I would also check the oil pressure switch to make sure it s not giving a false reading. The loss of power sounds like Turbo failure and again dirty oil to the Turbo oil feed pipes could be restricitng flow, hence why regular flushing oil and filter change is important.

I would get the Turbo checked out same time as on this model it could well be a Turbo and engine change if its gone that far due to the metal particles contaminating the engine.

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get it inspected. you may have engine sludge, or a failed oil pump, or a bad gauge or sender, or possible a failed engine. The main bearings on the crankshaft could be warn out causing this. Do not drive with no oil pressure or the engine will surely fail if it hasn't already.

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You could try another oil pressure sensor or test the oil pressure with a gauge at the sensor port. If you think about it, the truck goes into a failsafe mode when there is a problem. You could go into failsafe with high temperatures too. The water temp sensor could be bad but with the oil light coming on, the oil sensor should be your first choice.

You can get a free scan at Autozone or Oreillys and it may show the problem. Sometimes it takes a better scan with dealership type diagnostics because the self-diagnostics on your truck is limited.

Failsafe mode would cause the power loss because the truck is designed to kill cylinders and to use the dead cylinders as hot exhaust pumps to cool the block.

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