Still Chasing Engine/Trans Noise - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-15-2008, 03:10 PM   #1
azu
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Default Still Chasing Engine/Trans Noise

Ok, I have taken the belt off and checked all the pulleys and all seem ok with no noise or rough movement.

The noise I get only happens right before a trans shift during moderate to heavy acceleration. It will not do it at idle, in park at 2000 RPM (I know "bad"),or even in drive with RPM at 2000 with brake on. Once it shifts the noise goes away. Engine has plenty of power and seems unaffected when the noise is present. No codes are being thrown and recently passed state emission by a huge margin. I get KS but no KR.

Ok the noise. When starting just after it turns over I can hear what I call a rattle from the front of the engine. It comes quickly and goes quickly, maybe 2 seconds. The noise right before trans shift sounds a little like that but louder and I can hear some loud engine noise throughout the engine, not just the front. I can only describe it as a bearing spinning loose. Sounds like a diesel engine is another way to decribe it.

Is there anything in my scan I can look at that might help me diagnosis this? I have the Actron 9145 and it gives me lots of live data. The engine doesn't use oil,doesn't smoke and gets decent gas mileage. The problem does seem to be getting worse. I'll see if I can put up an audio which would definitely help.
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Old 03-15-2008, 04:33 PM   #2
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The torque converter can make a rattling noise on start up until the pump fills it back up with fluid. This usually takes no longer than 15 seconds after start up. I am no transmission expert, so maybe one can verify this for us, but it seems to me that when this occurs it is because trans fluid is draining out of the TC when it shouldn't, maybe through a leaking seal or check valve.

You have, of course, checked your trans fluid to make sure it is full?
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Old 03-15-2008, 06:28 PM   #3
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Back of mind I am thinking trans problem, but it shifts smoothly and timely. I did check fluid and it is at proper level and looks and smells fine.
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