Engine knock
#1
Engine knock
Hey so my camaros got a 350 swapped into it and today it started making an aweful sound and im looking for help narrowing down on what it is. When you start it and drive around under about 2500 rpms you can hardly hear anything, maybe a little tick but nothing really noticable. Above about 2500rpm it starts making an aweful knocking sound, sounds like someones beating my oil pan with an air hammer or like a 3/4" air gun that gets worse and worse with rpm and it happens regardless of load. Any ideas would be great thanks.
#2
COTM Editor
iTrader: (22)
Join Date: Mar 2001
Posts: 9,928
Likes: 0
Received 1,860 Likes
on
1,274 Posts
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Engine knock
First step, I'd pull all the spark plugs and see if they tell a story. Post pictures here if you want help reading the plugs. Make sure you know which plug belongs to which cylinder in case you need to follow up with something.
Meanwhile, might be smart to stop running the engine for now.
Meanwhile, might be smart to stop running the engine for now.
#3
Supreme Member
iTrader: (1)
Join Date: Feb 2017
Location: Meriden, CT 06450
Posts: 4,033
Received 514 Likes
on
430 Posts
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Engine knock
Another thing to check for is a cracked flexplate or loose flexplate bolts (assuming it's an auto transmission).
#4
#5
Supreme Member
iTrader: (1)
Join Date: Feb 2017
Location: Meriden, CT 06450
Posts: 4,033
Received 514 Likes
on
430 Posts
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Engine knock
It could, just less likely.
#6
Supreme Member
Join Date: Jan 2008
Posts: 1,031
Received 419 Likes
on
300 Posts
Car: 1986 IROC Z
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 3.23 Posi
Re: Engine knock
Hey so my camaros got a 350 swapped into it and today it started making an aweful sound and im looking for help narrowing down on what it is. When you start it and drive around under about 2500 rpms you can hardly hear anything, maybe a little tick but nothing really noticable. Above about 2500rpm it starts making an aweful knocking sound, sounds like someones beating my oil pan with an air hammer or like a 3/4" air gun that gets worse and worse with rpm and it happens regardless of load. Any ideas would be great thanks.
Be extremely cautious under the hood with a running engine; the drive belts/pulleys will grab any loose clothing---or fingers.
Thread
Thread Starter
Forum
Replies
Last Post