"Like a Knock!"
Thread Starter
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Senior Member
Joined: Jan 2004
Posts: 1,035
Likes: 0
From: Near Cincinnati, OH
GM engines - "Like a Knock!"
Uh oh...is your GM ride a slappin'? hehe Better check this out...
GM engines including 1999-2003 3.1, 3.4, 4.3, 4.6 (Northstar), 4.8, 5.3, 5.7, 6.0, and 8.1 liter
http://www.pistonslap.com/
From a TSB:
At this time, replacing the engine assembly or pistons will not eliminate this noise. Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise them to contact Customer Assistance.
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So if you're engine is knocking, tough ****! says GM.
GM engines including 1999-2003 3.1, 3.4, 4.3, 4.6 (Northstar), 4.8, 5.3, 5.7, 6.0, and 8.1 liter
http://www.pistonslap.com/
From a TSB:
At this time, replacing the engine assembly or pistons will not eliminate this noise. Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise them to contact Customer Assistance.
---------------
So if you're engine is knocking, tough ****! says GM.
Last edited by lariatf150; Sep 9, 2004 at 12:55 PM.
Thread Starter
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Senior Member
Joined: Jan 2004
Posts: 1,035
Likes: 0
From: Near Cincinnati, OH
The scary thing is, I would have bought a new Silverado (we get employee pricing through a grandparent) with the 5.3L if it hadn't been for Ford totally redesigning the F-150. So I bought the F-150 instead 
Senior Member
Joined: Nov 2003
Posts: 175
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From: Michigan
I went from a GM to a Ford
I had a 1999 Sierra with the 4.8L, it got the CSK (cold start knock) at about 25,000 I thought I just got a bad one, got rid of that truck for a 2001 Silverado with a 5.3L loved the truck, but it started knocking at 16,000 and even louder and more often then my 1999. So I take it to the dealer and they say "oh that’s normal, they all do that" I said "I don't think so, they may all do it, but this isn't normal!" Did some web searching found www.pistonslap.com and about 3 days of misery and complete sickness I sold it to a wholesaler, and bought my Ford a week later.
Senior Member
Joined: Mar 1998
Posts: 1,719
Likes: 1
From: Blue Ridge Mountains, GA
My brothers' 2003 Sierra has that problem. It was supposedly fixed after the end of the 2002 model year run. Obviously not. His only has 2x,xxx miles and seems to get louder as time goes by. 
