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Old 06-12-2013, 08:54 AM   #1
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I have a Pontiac Bonneville with a 3800 with 144,000 miles. I fueled up at a filling station ad when I started the engine I heard it knocking. Sounded like it was coming from the top side of the engine but the I noticed that the oil pressure gauge was fluctuating bad. Car is in excellent shape and motor uses about 1/2 qt on a 3000 mile oil change interval. Where do I begin?
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Old 06-12-2013, 11:59 AM   #2
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Our oil gages are notoriously unreliable, and most times I tell people to ignore them. In this case, however, when the reading fluctuations are accompanied by engine knock, I suggest you not drive the car until you figure this out. I would start by getting a proper oil pressure gage and using it to see what the actual oil pressure is. You may also want to invest in a mechanics stethoscope ($10) to help narrow down where the knock is coming from.
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Old 06-12-2013, 08:06 PM   #3
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Check your oil level and coolant level also. Me thinks you may have eaten some lower end bearings.

Being a 2000, do you know the complete repair history of your car?
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Old 06-13-2013, 09:56 AM   #4
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To Mike'* point, you might want to drop the oil pan and see if there are any pieces of metal in there.
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