96 Bonneville Oil Pressure/Engine Knock problems - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-02-2012, 09:14 PM   #41
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It would be very hard to cover up a knock. It'* more likely the engine was old and not able to handle getting on it for an extended time.
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Old 04-02-2012, 09:14 PM   #42
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In the first stage, it will be real silent. Hard to pickup. Mine was the same way. Until you increased the RPM or put a load on it then you could hear it. When it really starts to go, you WILL know it. Just don't climb a hill at 3500 rpm. Things will come out of places they shouldn't. LOL.
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Old 04-02-2012, 09:16 PM   #43
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It would be very hard to cover up a knock. It'* more likely the engine was old and not able to handle getting on it for an extended time.
Is it possilbe the previous owner used a heavier oil. Then when the new owner did an "italian cleanout" which made the oil hot and thin, caused the sound to come back?
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Old 04-02-2012, 09:17 PM   #44
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The first sign is the oil pressure drops at idle to perhaps 20 psi or lower. After that, it'* all down hill real fast.
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Old 04-02-2012, 09:20 PM   #45
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Quote:
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Is it possilbe the previous owner used a heavier oil. Then when the new owner did an "italian cleanout" which made the oil hot and thin, caused the sound to come back?
It is possible, because the day I bought it I had oil and filter changed at a shop so I can keep track of oil myself.

Also its funny you talk about load, the night I driving it in heavy rain I had 3 passengers which was the first time the car had some load.
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Old 04-02-2012, 09:20 PM   #46
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Yup, same thing happened to mine last year. Heard a knock-knock-knock...oil was fine for awhile, but in the 90 summer heat, OP dropped and it was game over.
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Old 04-02-2012, 09:32 PM   #47
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How much more driving this engine have left in it? 5miles?
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Old 04-02-2012, 09:40 PM   #48
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Downhill with a hurricane behind you, ohhh, about 20-30 miles. Uphill with a tailwind, about 20-30 feet. Its not a precise science. It'* not a matter of if, its a matter of when.
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Old 04-02-2012, 09:45 PM   #49
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Well I'm glad we don't have any hills here.
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Old 04-02-2012, 10:09 PM   #50
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had a 3800 sound that way and it turned out to be the harmonic balancer just a thought
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