07 engine troubles
Burning Brakes
Joined: May 2006
Posts: 867
Likes: 0
From: Cary North Carolina
Come on guys. The thread originator has a concern, and is asking for some meaningful response. To replay and say "No problem with my car" provides nothing constructive. If you don't have something useful to say, then maybe just move on rather than taking up space on the tread.
There, I ranted enough.
There, I ranted enough.
Instructor
Joined: Jan 2006
Posts: 158
Likes: 0
From: Norco California
Come on guys. The thread originator has a concern, and is asking for some meaningful response. To replay and say "No problem with my car" provides nothing constructive. If you don't have something useful to say, then maybe just move on rather than taking up space on the tread. There, I ranted enough.
There, I ranted enough.
Safety Car
Joined: Oct 2004
Posts: 3,786
Likes: 0
From: Pleasanton California
It is reportedly common for the LS2's to have a sewing machine sound, but I have not heard of any issues with any failing like this. Mine is a "ticker", but a strong runner, & the sound hasn't changed from day one to now.
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Le Mans Master
Joined: Aug 2005
Posts: 6,779
Likes: 2
From: NCM Lifetime Member
St. Jude Donor '12-'13-'14-'15-'16-'17-'18-‘19-'20
Number 7
Please disregard this if the sounds are actually changing. I mention my experience because before I had anyone tear into my engine I would be certain that there is a problem. These engines are nearly fail-proof.
From mile one in my '07, I was concerned about a sound of hard metal-on-metal ticking. Being from the old days, it reminded of other engines having serious problems. I drove two other '07s and each had the same sound.
If the ticking, clicking, clacking is not changing, then please consider my findings.
I spoke with knowledgeable Chevrolet engineers who eventually told me that the valve train is noisy at all cylinders. However, cylinder 7 is situated perfectly for its sound to transmit "very clearly" into the passenger compartment.
This sound is normal.
Sometimes the sound changes because ambient noises change. If I listen carefully on quiet streets over a wide RPM range, I hear the ticking... sometimes loud, sometimes less loud. But I am a little nuts when it comes to this type of sound...
From mile one in my '07, I was concerned about a sound of hard metal-on-metal ticking. Being from the old days, it reminded of other engines having serious problems. I drove two other '07s and each had the same sound.
If the ticking, clicking, clacking is not changing, then please consider my findings.
I spoke with knowledgeable Chevrolet engineers who eventually told me that the valve train is noisy at all cylinders. However, cylinder 7 is situated perfectly for its sound to transmit "very clearly" into the passenger compartment.
This sound is normal.
Sometimes the sound changes because ambient noises change. If I listen carefully on quiet streets over a wide RPM range, I hear the ticking... sometimes loud, sometimes less loud. But I am a little nuts when it comes to this type of sound...
Last edited by PeterSG; Apr 24, 2008 at 08:19 PM.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I just got back from a long trip with my '07. One morning, it tapped up a storm which is the first time I've heard that from it. It sounded like there wasn't any oil in it. All the way back home over two days, it was fine.
Team Owner
Joined: Apr 2008
Posts: 22,518
Likes: 1,688
From: South Carolina
lsx engines are noisy by nature....some are more noisy than others...this is my second ls2...it is much louder than my 05 ls2...valve train noise...but it is typical ls noise imo....this one I have now has a distinct one valve lifter tick when cold....much better when warm. I'm not real worried based on the way lsx engines sound in general. My ls1 was loud too lol...
They are loud and aluminum blocks are loud so that doesn't help either.
They are loud and aluminum blocks are loud so that doesn't help either.
Race Director
Joined: Jun 2001
Posts: 10,084
Likes: 3,056
From: CA
lsx engines are noisy by nature....some are more noisy than others...this is my second ls2...it is much louder than my 05 ls2...valve train noise...but it is typical ls noise imo....this one I have now has a distinct one valve lifter tick when cold....much better when warm. I'm not real worried based on the way lsx engines sound in general. My ls1 was loud too lol...
They are loud and aluminum blocks are loud so that doesn't help either.
They are loud and aluminum blocks are loud so that doesn't help either.
To the original poster, I would recommend checking out some other cars for comparison.
Michael
Drifting
Joined: Mar 2005
Posts: 1,760
Likes: 69
From: Fayetteville Arkansas recently moved from Oakland Ca
St. Jude Donor '06
Intermediate
Joined: Feb 2008
Posts: 48
Likes: 0
Oil aeration?
There was a TSB (http://www.pistonslap.com/tsb/020601038.htm) for LS1 and LS6 that states oil aeration caused by cut o-ring in oil pump is the cause of the lifter/valvetrain noise. It makes sense since oil aeration is "the main cause of valve train rattle" (http://www.raceweb.co.za/vtecpower.htm)
Marvel Mystery Oil has the effect of reducing oil foaming which could be why it is effective for some people. I suggest going to an ASE certified independent mechanic and have them check for oil aeration or oil pump o-ring, which is what I will do. From my experience going to dealer is only a waste of time --- I went to 4 different dealers and none was willing to admit there is anything abnormal.
Marvel Mystery Oil has the effect of reducing oil foaming which could be why it is effective for some people. I suggest going to an ASE certified independent mechanic and have them check for oil aeration or oil pump o-ring, which is what I will do. From my experience going to dealer is only a waste of time --- I went to 4 different dealers and none was willing to admit there is anything abnormal.
Last edited by bugbugbug; May 15, 2008 at 03:56 PM.
Racer
Joined: Jun 2006
Posts: 414
Likes: 0
From: Overland Park KS
I have had this same problem (07 Coupe) but I thought that I was overreacting. I have also noticed that when I accelerate and let off then try to accelerate again, it almost feels as if it is missing the gear...hard to explain and I have been meaning to take it in for a check up...if I can ever get away from this stupid work project 
