Anybody know what this engine/trans knock is? - Video - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-26-2007, 07:37 PM   #1
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Default Anybody know what this engine/trans knock is? - Video

I have a knocking noise in the engine or trans of my '95 SE. I can hear it when I rev the engine as the RPM is coming down. The trans is in park when I hear it.

A couple times I have heard it constant when the engine was idling. It would stop when I raise the engine RPM. It is definately coming from the driver'* side of the car.

I've included a link to a video so the noise can be heard. the whole video is almost 2 minutes long.

Can anyone identify it? Thanks.

http://s186.photobucket.com/albums/x...villeKnock.flv

Dave
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Old 05-26-2007, 08:14 PM   #2
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My speakers here at work suck. Try it with the */c belt off. If its still there check the harmonic balancer; if its not then the */cer guys can help diag it from there.
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Old 05-26-2007, 08:23 PM   #3
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It doesn't have a supercharger, it'* an N/A engine. That'* just engine noise.

The noise seems to be coming from the driver'* side of the car. I don't believe it'* the harmonic balancer - wrong side of the engine.
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Old 05-26-2007, 10:29 PM   #4
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maybe broken/breaking/failing flex plate? torque converter failing? never personally heard of a torque converter making noise, but i could be wrong, but thats about the only two things i can think of on that side of the engine that could possibly make noise.
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Old 05-26-2007, 10:54 PM   #5
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Hard to tell until you shoot video from farther away (out of the engine bay) and from underneath, but I'd say it'* either rod knock, wrist pin, or a lifter. In any case:

http://www.bonnevilleclub.com/forum/...e=article&k=38

How'* the coolant look? What about the oil?
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Old 05-26-2007, 11:14 PM   #6
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Quote:
Originally Posted by willwren
Hard to tell until you shoot video from farther away (out of the engine bay) and from underneath, but I'd say it'* either rod knock, wrist pin, or a lifter. In any case:

http://www.bonnevilleclub.com/forum/...e=article&k=38

How'* the coolant look? What about the oil?
Willwren thanks for the link to the previous post.

I changed the upper intake maybe 4 or 5 years ago with a new one from GM dealer. I did not change the lower intake gaskets at the time though. I think I changed it before I found this forum. I'll have to check tomorrow in the daylight to see what the date stamp on the UIM is.

I change oil regularly, 3k-5k miles, try to make it around 3k. Oil has not had water in it since changing UIM.

I'll try to get another video maybe tomorrow further away from the engine. I wasn't sure if the knocking would be picked up by the camera if the camera was further away.

I didn't mention in my first post that I've had the torque converter shudder while in lock up when a load is put on the engine. Had it when I bought the car at 122k, car now has 182k on it. No other problems with tranny the whole time.
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Old 05-26-2007, 11:23 PM   #7
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The date on the UIM has nothing to do with anything. If it'* not a Dillon, Dorman, or APN, it can fail within 2-3 years. We've had GM intake manifolds fail that early.

That may or may not be your problem, but if you have a GM intake on the car, and it'* NOT your current problem (causing the engine to fail), we need to keep cracking at this.

If the UIM caused the noise, the engine is toast.
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