sounds like a knock
Thread Starter
Melting Slicks
Joined: Oct 2008
Posts: 3,121
Likes: 31
From: Jacksonville Florida
sounds like a knock
2003 LS1 12500miles. I hear what sounds like a knock coming from the passenger side of the motor when I first crank. The noise goes away in short time after driving I want to say it is the belt tensioner but I am not sure anybody have any hints? Oil is good pressure is good and oil temp barely reaches 200 degrees while driving.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
2003 LS1 12500miles. I hear what sounds like a knock coming from the passenger side of the motor when I first crank. The noise goes away in short time after driving I want to say it is the belt tensioner but I am not sure anybody have any hints? Oil is good pressure is good and oil temp barely reaches 200 degrees while driving.
Thread Starter
Melting Slicks
Joined: Oct 2008
Posts: 3,121
Likes: 31
From: Jacksonville Florida
I would say that it is more of a tapping than a knock and it is loudest on first crank cold engine. It does not last long but is loud enough to make me wonder WTF. How long would the lazy lifter tap after the engine is warm?
Safety Car
Joined: Oct 2004
Posts: 4,816
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From: Plano TX
Safety Car
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
piston slap is very normal and that link is a little exageratted in my opinion.. Its just the nature of the beast and is more annoying/embarrassing than anything else... My 99 c5 had it and it was just something you had to get used to.. I did a lot of searching to find more info on this piston slap.. Theres never been any engine failures due to this.. Many folks have 0ver 150k miles with no problems.. Do a search on this forum. Type in piston slap.. It will put you at ease... It is annoying and bothered me for a long time.. My 02 z06 does not have this issue..
Le Mans Master
Joined: Jan 2007
Posts: 7,364
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From: Rocky Mount Virginia
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Tech Contributor
Joined: Dec 2006
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From: Van Buren Arkansas
Wounded Warrior Escort '11
This is real basic...if its tap from the top end, then its a lifter. If its a knock from the bottom end, then its either the reported piston slap or a rod bearing.
Drifting
Joined: Nov 2007
Posts: 1,616
Likes: 11
From: Newport, RI
http://forums.corvetteforum.com/c5-g...hing-help.html
There's a good thread on piston slap - which it sounds like you have............
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There's a good thread on piston slap - which it sounds like you have............
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