engine noise
Thread Starter
Pro
Joined: Feb 2011
Posts: 605
Likes: 1
From: Helotes TX
engine noise
I have a 07 z-51 that makes no engine noise when at cold idel, however when i start dirving it (cold engine) it makes a slight knocking noise until the engine warms up. the dealer told me this is due to the all alum eng. Anyone heard of this before??
Burning Brakes
Joined: Sep 2010
Posts: 991
Likes: 1
From: Longmont Co
Hope this helps. Jack.
Race Director
Joined: Oct 2010
Posts: 14,475
Likes: 785
From: Las Vegas NV
Do a search for piston slap. There's a thread a couple pages long about it.
Never mind, here's the thread.
http://forums.corvetteforum.com/c6-c...when-cold.html
Never mind, here's the thread.
http://forums.corvetteforum.com/c6-c...when-cold.html
Le Mans Master
Joined: Aug 1999
Posts: 5,411
Likes: 2
From: N Carolina 08 Z51 Coupe
Piston knock or valve noise?
These cars have loud valve trains.. louder at certain times.. and some do have some piston slap until things warm up and expand..
A real loud uneven knock is something to be concerned about for sure..
These cars have loud valve trains.. louder at certain times.. and some do have some piston slap until things warm up and expand..
A real loud uneven knock is something to be concerned about for sure..
Navigator
Joined: Mar 2011
Posts: 9
Likes: 0
C6 2005 z51 cold engine noise.
My 2005 c6 with 15k miles has a ticking noise sounds like a loud exhaust leak from one particular spot sounds kinda low in the car. Only when cold and when the clutch is engaged and starting to put power to the wheels. Noise persistent for the first 5 minutes or so. The noise never returns until the motor is allowed to cool completely down.
Cruising
Joined: Dec 2009
Posts: 11
Likes: 0
From: CA
ticking
my 2005 c6 with 35 k miles started ticking a few days ago. It only does it for thre first five minutes or two to three miles. it is almost like a crackling sound. I think I have narrowed it to the AC compressor clutch or hopefully to a sound made by the belts.
Try to turn the AC on and off and see if the noise lessens. Mine is less with the AC off but there is still some ticking. I hadn't started the car in three weeks and now notice a bit of rust on the smooth side of one of the belt pulleys. A mechanic friend said he has heard similar sounds that he has fixed by cleaning the belts or pulleys. Otherwise I believe it will be the clutch on the AC compressor. But the fact that is dissappears when the car is warm leads me to hope it is dirty belts or pulleys.
Try to turn the AC on and off and see if the noise lessens. Mine is less with the AC off but there is still some ticking. I hadn't started the car in three weeks and now notice a bit of rust on the smooth side of one of the belt pulleys. A mechanic friend said he has heard similar sounds that he has fixed by cleaning the belts or pulleys. Otherwise I believe it will be the clutch on the AC compressor. But the fact that is dissappears when the car is warm leads me to hope it is dirty belts or pulleys.
