unusual engine problem
Thread Starter
Instructor
Joined: Mar 2009
Posts: 216
Likes: 0
From: Inwood West Virginia
unusual engine problem
A few months ago over the winter, I noticed a squeaking noice, which sounded like it came from the Air intake. I recently took it to a repair shop, and the mechanic noticed that my harmonic balancer is way out of balance that I never noticed before. The '07 barely has 20,000 miles and no one was able to find the part in stock. I went on gmpartshouse.com and found a balancer but there was barely any description of the part. (no part number etc...) Has anyone else with an 07 had similar problems?
Le Mans Master
Joined: Aug 2005
Posts: 6,709
Likes: 1
From: Pacific Northwest
St. Jude Donor '06
A few months ago over the winter, I noticed a squeaking noice, which sounded like it came from the Air intake. I recently took it to a repair shop, and the mechanic noticed that my harmonic balancer is way out of balance that I never noticed before. The '07 barely has 20,000 miles and no one was able to find the part in stock. I went on gmpartshouse.com and found a balancer but there was barely any description of the part. (no part number etc...) Has anyone else with an 07 had similar problems?
Here's one of the discussions...
http://forums.corvetteforum.com/c6-c...ose-gotem.html
Last edited by C-INRED; Jun 6, 2011 at 11:13 PM.
Advanced
Joined: Apr 2010
Posts: 84
Likes: 9
From: Neptune NJ
A few months ago over the winter, I noticed a squeaking noice, which sounded like it came from the Air intake. I recently took it to a repair shop, and the mechanic noticed that my harmonic balancer is way out of balance that I never noticed before. The '07 barely has 20,000 miles and no one was able to find the part in stock. I went on gmpartshouse.com and found a balancer but there was barely any description of the part. (no part number etc...) Has anyone else with an 07 had similar problems?
Drifting
Joined: Jul 2009
Posts: 1,435
Likes: 19
From: Sioux Falls South Dakota
CF Senior Member
Joined: Feb 2006
Posts: 23,313
Likes: 25
From: Tucson Arizona
This was a problem with some very early VIN 2005's but it can happen with any model year. For whatever reason, after making millions of engines without this problem, GM abandoned using a key to secure the harmonic balancer. All the Gen III and Gen IV V8 engines use a press-fit damper with no keyway. It's been this way since the LS1 was introduced in 1997. To remedy the problem, a friction washer became a production part in the 2006 LS2 and LS7 engines (and I suspect in the late model 2005's as well). It's not what I'd consider a widespread problem but it happens too much for my comfort level. The only sure fire fix is to pin the crank. All forced induction applications require a pinned crankshaft and IMO it would benefit high power naturally aspirated applications as well.
It's not ideal but FWIW a slight amount of pulley wobble may be within acceptable parameters. That's to say your car may run just fine with some pulley wobble. If the crank-pulley isn't loose and you're not shredding belts you might be OK. Again, it's obviously not ideal but I've seen C6's run fine for years with a minor amount of wobble. The OEM crank-pulley isn't known for precision construction. There are better after market solutions if you need to replace it.
It's not ideal but FWIW a slight amount of pulley wobble may be within acceptable parameters. That's to say your car may run just fine with some pulley wobble. If the crank-pulley isn't loose and you're not shredding belts you might be OK. Again, it's obviously not ideal but I've seen C6's run fine for years with a minor amount of wobble. The OEM crank-pulley isn't known for precision construction. There are better after market solutions if you need to replace it.
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
This was a problem with some very early VIN 2005's but it can happen with any model year. For whatever reason, after making millions of engines without this problem, GM abandoned using a key to secure the harmonic balancer. All the Gen III and Gen IV V8 engines use a press-fit damper with no keyway. It's been this way since the LS1 was introduced in 1997. To remedy the problem, a friction washer became a production part in the 2006 LS2 and LS7 engines (and I suspect in the late model 2005's as well). It's not what I'd consider a widespread problem but it happens too much for my comfort level. The only sure fire fix is to pin the crank. All forced induction applications require a pinned crankshaft and IMO it would benefit high power naturally aspirated applications as well.
It's not ideal but FWIW a slight amount of pulley wobble may be within acceptable parameters. That's to say your car may run just fine with some pulley wobble. If the crank-pulley isn't loose and you're not shredding belts you might be OK. Again, it's obviously not ideal but I've seen C6's run fine for years with a minor amount of wobble. The OEM crank-pulley isn't known for precision construction. There are better after market solutions if you need to replace it.
It's not ideal but FWIW a slight amount of pulley wobble may be within acceptable parameters. That's to say your car may run just fine with some pulley wobble. If the crank-pulley isn't loose and you're not shredding belts you might be OK. Again, it's obviously not ideal but I've seen C6's run fine for years with a minor amount of wobble. The OEM crank-pulley isn't known for precision construction. There are better after market solutions if you need to replace it.
Drifting
Joined: Feb 2010
Posts: 1,527
Likes: 34
The problem I see is "IF" it decides to go it usually doesn't give much warning! You can be in the middle of no where and/or the failure can results in some catastrophic damage..... IMO it's not worth risking if you drive your vette a lot. Mine's pinned because I'm SC'd but the mickey mouse setup GM uses always concerned me. If I saw much wobble I'd get it fixed... preferably by pinning but at least get it repaired. BTW.. there is an easy way to pin the crank pulley WITHOUT dropping the rack! Saves about 4+ hours of labor.....
By the way, since you know an easier way to pin, please share. We can all benefit.
Instructor
Joined: Apr 2006
Posts: 190
Likes: 0
From: Sugar Land Tx
Unfortunately there is nothing unusual about this engine issue…
It is a real shame GM does not own up to it and cover the repairs beyond the normal warranty!
Yes I know that will get a laugh out of many people but I can tell you I have seen this done by other auto manufactures by giving an extended warranty for specific problems.
It is a real shame GM does not own up to it and cover the repairs beyond the normal warranty!
Yes I know that will get a laugh out of many people but I can tell you I have seen this done by other auto manufactures by giving an extended warranty for specific problems.
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Brett Foote
Race Director
Joined: Mar 2010
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There are a number of threads on this issue on the forum. I am not an expert either, but I do know that it ranges within the years. It does happen and it appears to be semi common.
Good luck out there.
Brent
GM Customer Service
Good luck out there.
Brent
GM Customer Service
Drifting
Joined: Feb 2010
Posts: 1,527
Likes: 34
What function does GM Customer Service serve here?
Drifting
Joined: Mar 2009
Posts: 1,285
Likes: 52
From: Salt Lake City, UT
C6 of Year Finalist (appearance mods) 2019
My car doesn't make the chirping noise as it is described, but sometimes when at idle I can hear a light metallic chain noise. Sounds like someone's dragging a chain across concrete. Anybody know what it could be? Seems to be relative to whether or not I have the climate control on. When I turn the climate control ON, the noise goes away. The noise is also intermittent.
Race Director
Joined: Dec 2010
Posts: 18,093
Likes: 1,585
The problem I see is "IF" it decides to go it usually doesn't give much warning! You can be in the middle of no where and/or the failure can results in some catastrophic damage..... IMO it's not worth risking if you drive your vette a lot. Mine's pinned because I'm SC'd but the mickey mouse setup GM uses always concerned me. If I saw much wobble I'd get it fixed... preferably by pinning but at least get it repaired. BTW.. there is an easy way to pin the crank pulley WITHOUT dropping the rack! Saves about 4+ hours of labor.....
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
Follow the link and read the PDF. It will show you how to do it without dropping the rack. ECS did the same thing pretty much when they installed my E-force.....
http://www.magnacharger.com/pdf/manu...ntercooled.pdf
http://www.magnacharger.com/pdf/manu...ntercooled.pdf
Race Director
Joined: Dec 2010
Posts: 18,093
Likes: 1,585
Follow the link and read the PDF. It will show you how to do it without dropping the rack. ECS did the same thing pretty much when they installed my E-force.....
http://www.magnacharger.com/pdf/manu...ntercooled.pdf
http://www.magnacharger.com/pdf/manu...ntercooled.pdf
Race Director
Joined: Mar 2010
Posts: 16,002
Likes: 824
The Corvette Forum has graciously allowed GM to monitor this forum to keep in touch with what is going on with our Corvettes. My basic function within the forum is to work as a medium between Customer Assistance and the owner. I do not have authority to diagnose your vehicle nore to help personally in the event that you need something from GM, but I do know where to turn and in a lot of areas, how to go about seeking assistance.
I can locate dealerships as well for those members who may be curious as to what dealerships are around them. I also use the information to reply to GM with certain issues.
Brent
GM Customer Service
I can locate dealerships as well for those members who may be curious as to what dealerships are around them. I also use the information to reply to GM with certain issues.
Brent
GM Customer Service
Le Mans Master
Joined: Oct 2004
Posts: 6,813
Likes: 287
From: Toronto Ontario Canada
The Corvette Forum has graciously allowed GM to monitor this forum to keep in touch with what is going on with our Corvettes. My basic function within the forum is to work as a medium between Customer Assistance and the owner. I do not have authority to diagnose your vehicle nore to help personally in the event that you need something from GM, but I do know where to turn and in a lot of areas, how to go about seeking assistance.
I can locate dealerships as well for those members who may be curious as to what dealerships are around them. I also use the information to reply to GM with certain issues.
Brent
GM Customer Service
I can locate dealerships as well for those members who may be curious as to what dealerships are around them. I also use the information to reply to GM with certain issues.
Brent
GM Customer Service
Drifting
Joined: Feb 2010
Posts: 1,527
Likes: 34
Customer service is cool aide for public relations.
GM's engineering team cannot be out to lunch on this issue that also affects other models this long. Certain design is a long term bread provider for the automotive industry, for as long as the industry doesn't get burn by its intended design.
My former life was with the DOD, involved with tool design & tool making to keep the nuclear and conventional ships fit to fight. If an issue arised, even with the speed of operation the government is known for, it does not take this long to address an issue.
I choose not to play their game, took the proactive approach, changed out the time bomb with an ATI on my 05 and just walk away shaking my head in disbelieve!