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Old 09-09-2012, 04:33 PM   #1 (permalink)
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2003 Impala - 3800 series II v6 Engine - Low Oil Pressure problem

Hello,

I'm having a problem with low oil pressure in my 2003 Impala.

My issue begins with the engine overheating on August 4th, 2012. I took it to a mechanic and they replaced the coolant fitting by the manifold, and also replaced the manifold gaskets, as well as replacing the oil filter and put new oil in. After picking the car up, and driving the car for about 10 miles over half an hour back home, the low oil pressure indicator lit up on the dashboard and the lifters started making noise. I had the car towed back to the garage, where they took the oil pan off, looked at the pickup for the oil pump, and there was a grease-like substance covering it. They cleaned the substance off and changed the oil and filter once again. After picking it up a second time after it was "fixed", I drove the same distance over a half an hour (back to my house) and the low oil pressure indicator lit up again and the lifters began making noise again. So, i had it towed back and here I am.

It isn't a faulty indicator signal because the oil pressure is low once checked by the mechanics, and the lifters are making noises indicating there is a problem and it is not a false reading.

They checked the oil pump the first time they took the oil pan off and found the grease-like substance and they said the oil pump was ok, and that there was no visible wear on the drive mechanism. I mention this because I have read in other Q&A forums that low oil pressure can be caused by wear on the parts that drive the pump if not the pump itself.

So, if it's not an oil pump problem, and there is no visible damage to the inside, does anyone have an idea or suggestion on what could be continuously causing the low oil pressure? I believe it is an unusual problem, as low oil pressure should be indicated almost immediately upon starting the car and not take up to 30 minutes of driving to signal there is a problem?

Any and all help is appreciated, thank you.

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Old 09-10-2012, 04:55 PM   #2 (permalink)
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I would be looking into this "greasy substance", passages are probably clogging up. Possibly something resulting from the overheat?

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