Knocking noise all the time after I changed the oil and oil pressure switch - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-28-2012, 09:40 AM   #11
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I'll give it a listen. But if it'* the same as the video I posted, that'* a rod bearing. It will only get worse, and do so very fast.
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Old 05-28-2012, 10:26 AM   #12
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I noticed all the noise is at the bottom end of the motor but since I can't figure out how to work the camcorder on my phone I can't share with you the sound. Also I compared your sound and the sound I have and there are some inconsistencies to them. The knock is all the same but it gets louder if you accelerate also I have noticed some performance problems to. It don't seem to want to get up and go. It seams to hesitate a little bit when you accelerate.
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Old 05-28-2012, 10:27 AM   #13
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Also I bought a heavier weight oil and I am gonna change out the 5W 30 I put in there. I am changing it out to a 10W 30 setup.
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Old 05-28-2012, 10:48 AM   #14
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What engine does the car have?

I hate to say it, but it sounds like you bought somebody else'* problems. I bet it was making noise before, you throw 20w-50 in there, with lucas oil stabilizer in there, and the noise goes away, at least for a while. That jacks the oil pressure sky high (leaking oil pressure sensor is not surprising at this point) and shuts the engine up. If it is a v6, I suspect the extended life coolant was never serviced, and ate away gaskets, and dumped coolant in the oil. If it is a 4 cylinder, it could be cam noise also.

Also, a quick search tells me that you also had a plugged A/C drain, as well as an airbag deployment on the last owner due to a shorted airbag module. Based on how often inspections are in your area, I wonder if those are related as well.
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Old 05-28-2012, 11:27 AM   #15
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Yep the Coolant system has never been serviced but needs to be due to it is running a little on the warm side. Also I put 10W 30 in it along with reconnecting a few vacuum fitting and that quieted it down a little bit.
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Old 05-28-2012, 11:28 AM   #16
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Also there was no coolant in the oil when we drained it.
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Old 05-28-2012, 11:29 AM   #17
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It is the V6 series with the 3100 motor in it.
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Old 05-28-2012, 11:30 AM   #18
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I didn't think there would be, because they fixed the problem I bet.

What engine does the car have?
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Old 05-28-2012, 08:16 PM   #19
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It has the 3100 series V6 in it.
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Old 05-29-2012, 04:38 AM   #20
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Well my bottom knock went away when I switched over to 10W 30. I now just have lifters tap kinda loud.
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