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Thread: Motor noise/clunk LT1
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08-29-2019, 11:23 PM #1
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Motor noise/clunk LT1
Hello
I have a 1996 LT1 firebird.
I have a noise which I think is on the passenger side.
The car has a new water pump
I took the belt off and can still hear the noise.
It sounded like it was coming from rockarms but they seem to be running. I do not know the history of the motor. I was surprised to see roller rockers.
The car seems to have oil pressure I do have CEL for Crank position sensor
If you watch the video below you can hear it. I think it sounds like it washing machine with shoes in it.
Last edited by brota; 08-29-2019 at 11:26 PM.
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08-30-2019, 06:42 AM #2
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Sounds like a rod knock to me.
Adam Legatt 95 trans am, 355 LE ported 21* TFS heads SS4000, 9'' 11.18@ 121.5 mph
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08-30-2019, 08:55 AM #3
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Originally Posted by adam85
Is there an easy way to test/determine?
Thank you
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08-30-2019, 04:49 PM #4
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I'm sorry to say that's rod knock all the way man. How's oil pressure? Probably lower than normal? Maybe really low?
Originally Posted by Ryan Stout
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08-30-2019, 08:53 PM #5
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What I was expecting but was hoping an exhaust leak or something. Will check oil pressure later. Originally Posted by Fastbird
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08-31-2019, 01:53 PM #6
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I was going to say exhaust leak as well. but rod knock maybe just rev it a bit it should make a more rivmic sound on declaration but that can be the big end
Last edited by Stormyweather; 08-31-2019 at 02:03 PM.
1995 Trans Am - CAI - TB coolant bypass - Headers & Performance Muffler - Poly mounts - stock LT1/A4 - 13.3 1/4 - 1.9 60 foot , driven daily.
2008 C6 Corvette LS3 Snake charmer Ram Air intake. 6 Speed Switchable mild to wild exhaust.
2002 Silverado LT Extd Cab Z71 5.3 A4 Composite Bed Stock
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08-31-2019, 07:22 PM #7
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It seems to be on the top under intake sounded like running through valve cover.
Where could the exhaust leak be?
I will try to run it and check the oil pressure.
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09-01-2019, 10:10 AM #8
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OK i tightened a couple exhaust manifold bolts because I was going to change them.
Put the valve covers back on.
Put heat loose heat shield back in place.
Oil pressure was 60 on start up and I did not see it go below 20 when idle and hot.
I dont hear it or hear as much
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09-01-2019, 06:46 PM #9
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Hard to tell over the internet but I can still hear a knock in the videos. I would drain the oil and cut the filter open at this point.
Adam Legatt 95 trans am, 355 LE ported 21* TFS heads SS4000, 9'' 11.18@ 121.5 mph
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