If it is it's normal. 
Engine noise help!!
Thread Starter
Intermediate
Joined: Feb 2009
Posts: 43
Likes: 0
Engine noise help!!
I have an 08 vette with ls3 engine and it has 12k miles..I just noticed a knocking noise from the engine when i start the car in the morning.The noise dissapears after a few minutes....any comments or suggestions of what could be the cause of this noise?
Melting Slicks
Joined: Mar 2008
Posts: 2,835
Likes: 5
From: Avon Park FLORIDA
St. Jude Donor '08-'09-'10
So what did you do??
something making noise, goes away when it warms up?
oil pressure normal?
sound like you need to return to the dealer and have them check it.
wrong (no check valve) oil filter will cause a noise at start up until oil press build up,
can you tell us more about the noise??
something making noise, goes away when it warms up?
oil pressure normal?
sound like you need to return to the dealer and have them check it.
wrong (no check valve) oil filter will cause a noise at start up until oil press build up,
can you tell us more about the noise??
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Thread Starter
Intermediate
Joined: Feb 2009
Posts: 43
Likes: 0
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
It sounds like a lifter. Some times they dont get enough oil on start up because its too thick. Are you using the recommended weight? Are you parking it somewhere its cold like outside?
Team Owner
Joined: Aug 2007
Posts: 136,140
Likes: 2,432
From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
Lifter noise is more of a ticking sound, not a knock. And it should disappear within seconds not minutes of starting.
Does the knocking sound louder under load before it disappears? I'm thinking piston slap until parts expand enough (from heat) to quiet it.
Does the knocking sound louder under load before it disappears? I'm thinking piston slap until parts expand enough (from heat) to quiet it.
Thread Starter
Intermediate
Joined: Feb 2009
Posts: 43
Likes: 0
it doesnt sound louder under load, but if i press the gas the noise dissapears...
Drifting
Joined: May 2008
Posts: 1,621
Likes: 2
From: Petal Ms
St. Jude Donor '08-'11
Is it more of a knock or a tick?
knock
http://www.youtube.com/watch?v=-Gq9G...eature=related
tick
http://www.youtube.com/watch?v=DRqhk...eature=related
knock
http://www.youtube.com/watch?v=-Gq9G...eature=related
tick
http://www.youtube.com/watch?v=DRqhk...eature=related
Last edited by TinSecondRice; Apr 11, 2009 at 02:20 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Most likely piston slap. Most dealers will tell you its normal during cold start up.
Is your car under warranty????
If so, at least get it documented and see what the dealer says about it. Once it documented, if theres a problem in the future, you will have a better chance of some sort of assistance (IF GM STILL EXIST IN THE FUTURE!!!
:leaving 
Is your car under warranty????
If so, at least get it documented and see what the dealer says about it. Once it documented, if theres a problem in the future, you will have a better chance of some sort of assistance (IF GM STILL EXIST IN THE FUTURE!!!
:leaving
Racer
Joined: Oct 2005
Posts: 371
Likes: 0
From: Long Valley NJ
Got to the dealer and get it documented. I did. My 05 sounds like a box of rocks when it's cold and then for a while after when lifting the throttle between shifts.
The dealer told me it was due to the short skirt pistions. Mine goes away after the car is warmed up too. Not confidence inspiring to say the least. I thought I had a spun bearing or a connecting rod trying to set itself free from the block.
The dealer told me it was due to the short skirt pistions. Mine goes away after the car is warmed up too. Not confidence inspiring to say the least. I thought I had a spun bearing or a connecting rod trying to set itself free from the block.
Burning Brakes
Joined: Sep 2004
Posts: 998
Likes: 8
Interesting.
My daily driver is a 2005 GTO with the A4. I bought the car with only 4K miles. I currently have 81K miles. The car is stock, save for a Lingenfelter CAI. I do all of the oil changes myself and have used nothing but Mobil One 5W30 Full Synthetic, changed every 5K miles. I have a 100 mile round trip commute every day. All highway miles.
Last year I heard a loud knocking sound coming from the LS2 upon cold start up. It went away fairly quickly, like in 5 seconds. Then I never heard it again. Fast forward to this past Monday, temps were in the 30's and the knocking came back. Again it only lasted about 5 seconds and quickly went away as the car started to warm up. I have not heard it since, and air temps have been in the 30's.
Is this normal?
My daily driver is a 2005 GTO with the A4. I bought the car with only 4K miles. I currently have 81K miles. The car is stock, save for a Lingenfelter CAI. I do all of the oil changes myself and have used nothing but Mobil One 5W30 Full Synthetic, changed every 5K miles. I have a 100 mile round trip commute every day. All highway miles.
Last year I heard a loud knocking sound coming from the LS2 upon cold start up. It went away fairly quickly, like in 5 seconds. Then I never heard it again. Fast forward to this past Monday, temps were in the 30's and the knocking came back. Again it only lasted about 5 seconds and quickly went away as the car started to warm up. I have not heard it since, and air temps have been in the 30's.
Is this normal?
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
Interesting.
My daily driver is a 2005 GTO with the A4. I bought the car with only 4K miles. I currently have 81K miles. The car is stock, save for a Lingenfelter CAI. I do all of the oil changes myself and have used nothing but Mobil One 5W30 Full Synthetic, changed every 5K miles. I have a 100 mile round trip commute every day. All highway miles.
Last year I heard a loud knocking sound coming from the LS2 upon cold start up. It went away fairly quickly, like in 5 seconds. Then I never heard it again. Fast forward to this past Monday, temps were in the 30's and the knocking came back. Again it only lasted about 5 seconds and quickly went away as the car started to warm up. I have not heard it since, and air temps have been in the 30's.
Is this normal?
My daily driver is a 2005 GTO with the A4. I bought the car with only 4K miles. I currently have 81K miles. The car is stock, save for a Lingenfelter CAI. I do all of the oil changes myself and have used nothing but Mobil One 5W30 Full Synthetic, changed every 5K miles. I have a 100 mile round trip commute every day. All highway miles.
Last year I heard a loud knocking sound coming from the LS2 upon cold start up. It went away fairly quickly, like in 5 seconds. Then I never heard it again. Fast forward to this past Monday, temps were in the 30's and the knocking came back. Again it only lasted about 5 seconds and quickly went away as the car started to warm up. I have not heard it since, and air temps have been in the 30's.
Is this normal?
