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4.9

definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
21,030 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2009 Chevrolet Corvette engine problems

engine problem

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2009 Chevrolet Corvette Owner Comments

problem #10

Sep 022016

Corvette

  • 7,500 miles

A D V E R T I S E M E N T S

Valve guide issue causing failure to brakes, and power steering, as well as engine blowing

- Spring, TX, USA

problem #9

Mar 092016

Corvette

  • 37,000 miles
I was concerned about excessive valve train noise and after reading several Corvette forum threads about improperly machined heads by GM's supplier linamar, and that numerous vehicles have had valves drop and ruin the engines, I took my car with 37,000 miles on it to courtesy Chevrolet / Cadillac to have my valve guide clearance tested. I had (3) intake valve guides outside of service specifications, (7) exhaust valve guides outside of service specifications, and a combination of (11) other intake and exhaust valve guides at or near the maximum outside of service specifications. The cost of proper re-machining of the heads to make the valve guides concentric, new intake and exhaust valve guides installed, as well as new seals, valves, springs, etc. Is something I simply cannot afford at the moment with the downturn of the oilfield industry. Please bear in mind, my car had a replacement LS7 engine from a dropped exhaust valve before I owned it, so this has already happened to my car once. It occurred at 22xxx miles, and can have the GM dealer print a copy of the ro line to prove it. This is occurring at an alarming rate, but after our warranty period, we the consumer are left out to dry. 88% of the Corvette forum members who have had their cylinder heads tested for excessive valve guide wear, were out of service specifications. Source: www.corvetteforum.com/forums/...-registry.html GM needs to issue a recall on this issue, there have been numerous engine failures as a result of a dropped valve into a cylinder which can cause accidents and fires. GM is very aware of this issue, but refuses to do anything about this huge safety risk to drivers, passengers, and nearby vehicles if the engine fails going down the road. Please assist us in having GM make this right.

- Youngsville, LA, USA

problem #8

Sep 212015

Corvette

  • 15,000 miles
GM denies any sort of wide spread issue with respect to the manufacturing/assembly of the cylinder heads for the LS7 engine. There have been numerous catastrophic engine failures as a result of a broken valve head dropping into the cylinder and subsequently blowing a hole through the motor, causing fluids to leak all over the road, and complete loss of control of the vehicle. The symptoms are premature valve guide wear, which eventually become so worn that the valve closes on the wrong angle to the seat, and off breaks the valve head. The issue appears to be poor valve guide to valve seat concentricity, which leads to premature valve guide wear. My 2009 Z06 Corvette at only 15,000 street driven miles was inspected by a reputable third party repair facility, and discovered that 14/16 valve guides were beyond GM's service limit, and the remaining 2/16 were right at the limit. This is something that shouldn't occur until 150,000 miles at least...not 15,000. There needs to be an investigation before more catastrophic failures occur. There are hundreds if not thousands of documented occurrences.

- Honolulu, HI, USA

problem #7

Mar 122008

Corvette

  • 21,900 miles

A D V E R T I S E M E N T S

The LS7 engine is known to have bad 2 piece exhaust valves that come apart and fall into the cylinder resulting in a catastrophic engine failure that requires an entire new engine. This happened to me this past March 2015. GM needs to issue a recall on this issue, there have been numerous engine failures as a result of a dropped valve into a cylinder which can cause accidents and fires. GM is very aware of this issue, but refuses to do anything about this huge safety risk to drivers, passengers, and nearby vehicles if the engine fails going down the road.

- Schiller Park, IL, USA

problem #6

Apr 132015

Corvette 8-cyl

  • 23,845 miles
There was a manufacturing error made during engine build with the valve guides. They are making a noise currently. This can cause the engine to fail abruptly and consequently one could lose power (engine) and thus loose braking assist & power steering assist and can cause a crash & could be fatal.

- Rockwall, TX, USA

problem #5

Feb 172015

Corvette 8-cyl

  • 7,812 miles
I was concerned about excessive valve train noise and after reading several Corvette forum threads about improperly machined heads by GM's supplier linamar, and that numerous vehicles have had valves drop and ruin the engines, I took my car with 7800 miles on it to a Corvette specialty shop ( katech) to have my valve guide clearance tested. I had (5) intake valve guides outside of service specifications, (4) exhaust valve guides outside of service specifications, and a combination of (3) other intake and exhaust valve guides at or near the maximum outside of service specifications. The car is being repaired with proper re-machining of the heads to make the valve guides concentric, new intake and exhaust valve guides installed, as well as new seals, valves, springs, etc. 88% of the Corvette forum members who have had their cylinder heads tested for excessive valve guide wear, were out of service specifications. Source: www.corvetteforum.com/forums/...-registry.html GM needs to issue a recall on this issue, there have been numerous engine failures as a result of a dropped valve into a cylinder which can cause accidents and fires. GM is very aware of this issue, but refuses to do anything about this huge safety risk to drivers, passengers, and nearby vehicles if the engine fails going down the road. Here is a link with the guide measurements in it. www.corvetteforum.com/forums/C6-Z06-discussion/3608443-katech-stage-2-Z06-sn-74-a.html.

- Peotone, IL, USA

problem #4

Jan 232015

Corvette

  • 30,000 miles

A D V E R T I S E M E N T S

Engine had excessive noise. After reading several Corvette complaints about improperly machined heads by general motor's supplier linamar, and that numerous vehicles have had valves drop and catastrophic engine failure, I had my car with checked at a specialty shop. I had several valve guides outside of service specifications. The car is being repaired with proper re-machining of the heads to make the valve guides concentric, new intake and exhaust valve guides installed, as well as new seals, valves, springs, etc. 88% of the Corvette forum members who have had their cylinder heads tested for excessive valve guide wear, were out of service specifications. Source: www.corvetteforum.com/forums/...-registry.html GM needs to issue a recall on this issue. There have been numerous engine failures as a result of a dropped valve into a cylinder. This stops the engine, power steering, and power brakes which can cause accidents and fires. GM is very aware of this issue, but refuses to do anything about this huge safety risk to drivers, passengers, and nearby vehicles if the engine fails going down the road. Regards.

- Tucson, AZ, USA

problem #3

Oct 272014

Corvette 8-cyl

  • 7,500 miles
I became aware of a potential valve guide wear issue with the LS7 and LS9 engines through the Corvette forum, the Corvette action center, and other sources. I began researching the issue and decided that I should have my car checked out at a GM dealership. It was determined that the valve train noise appeared to be normal and the engine was not burning or using any excessive oil. The more I followed the valve guide wear issue, the more concerned I became. That being said and the fact that the dealer had never heard of or had any customer come in for the issue I decided to have a local performance engine shop (because of their extensive LS7 experience) install a reworked set of heads with bronze valve guides with additional parts recommend by the shop, to fix the problem permanently, based on their knowledge with the issue. My original heads were evaluated for valve guide wear and 'every intake and exhaust valve guide was outside of the GM service bulletin service limit of.0037 with the #8 intake valve being so far out that it was deemed N/R (so loose it was too big for the gauge readout). The vehicle only had 7500 miles on it. 88% of the Corvette forum members who have had their cylinder heads tested for excessive valve guide wear, were out of service specifications. Source: www.corvetteforum.com/forums/...-registry.html GM needs to issue a recall on this issue, there have been numerous engine failures as a result of a dropped valve into a cylinder which can cause accidents and fires. GM is very aware of this issue, but refuses to do anything about this huge safety risk to drivers, passengers, and nearby vehicles if the engine fails going down the road.

- Plymouth, MI, USA

problem #2

Jun 032014

Corvette 8-cyl

  • 45,748 miles
The engine exhaust valve guides were outside of GM specifications and both cylinder heads were replaced under warranty because of this. This defect can cause the head of a valve to snap off and destroy the engine. The engine will stop working immediately, causing the power steering and power brakes systems to fail. The valve failure can cause a oil spill onto the road if the engine is destroyed. There have been numerous engine failures as a result of a dropped valve into a cylinder which can cause accidents and fires. GM is very aware of this issue, but refuses to do anything about this huge safety risk to drivers, passengers, and nearby vehicles if the engine fails going down the road.

- Renovo, PA, USA

problem #1

Oct 152013

Corvette 8-cyl

  • 14,000 miles
My son's car blew up while traveling on the freeway almost causing an accident. He will file a separate complaint. There is a systemic problem with the Z06 and the 427 engine so I had my heads checked as a preventative measure and they were far enough out of spec that self destruction was imminent. The heads were checked and replaced by a Chevrolet dealer. There are hundreds of examples of this problem on the Corvette forum and it's only a matter of time before someone gets seriously injured. I sincerely hope you will look into this problem in time to perhaps save someone's life.

- Oakhurst, CA, USA

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