Consistent Knocking sound
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Junior Member
Joined: May 2021
Posts: 21
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Car: 1987 camaro Sport coupe
Engine: 2.8l multiport FI
Transmission: 4 speed with OD
Consistent Knocking sound
I have a 1988 l98 350 installed in my 1991 z28. Engine was fully converted to speed density. It runs idles and revs just fine. This knocking sound worries me tho. Is it a rod main or possibly cam knock? It seems too consistent to be a rod to me but hey I’m the noob
Joined: Oct 2001
Posts: 12,221
Likes: 1,141
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Consistent Knocking sound
Video really not long enough to get a good listen but could be any number of things.
some quick ideas
pull off accessory belt and see if its something there.
Check balancer and make sure outer ring isnt hitting timing cover.
was the pan dented anywhere?
Flexplate/tqconverter bolts loose?
some quick ideas
pull off accessory belt and see if its something there.
Check balancer and make sure outer ring isnt hitting timing cover.
was the pan dented anywhere?
Flexplate/tqconverter bolts loose?
Supreme Member
Joined: Jun 2012
Posts: 1,367
Likes: 193
From: Canada
Car: '18 Chev Camaro SS 1LE
Engine: LT1 6.2L
Transmission: T56
Axle/Gears: 3.91
Re: Consistent Knocking sound
Was this ever solved?
Is sounds like an air pump (AIRS) failure, but it just sounds like it from the video.
Sounds like a thump like air compressor.
2 cents worth
Is sounds like an air pump (AIRS) failure, but it just sounds like it from the video.
Sounds like a thump like air compressor.
2 cents worth
Joined: Apr 2010
Posts: 513
Likes: 43
From: New Jersey
Car: 87 Monte Carlo SS
Engine: 89 350TPI Transplant
Transmission: 2004r
Axle/Gears: 3.73
Re: Consistent Knocking sound
I had a knocking sound a few years ago on my TPI 350 swap. Heard it best at the front of the car at the grill. I used a mechanics stethoscope and narrowed it down to the AIR pump. I removed the pump and replaced it with a bypass pulley and the knock sound was gone.
I suggest you use a mechanics stethoscope to narrow down the sound.
Good Luck,
Fred
I suggest you use a mechanics stethoscope to narrow down the sound.
Good Luck,
Fred
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