bwag64

I have a 2010 Grand Sport with 28k miles. I recently had my last free oil change under the GM certified car program. On the way home my traction control light comes on (about a block away) and then the engine starts running extremely rough. Code says MAP sensor. I replace it with no change. It was making all kinds of wierd noises as I barely pulled in the driveway. Long story short, no compression on #6. HAS ANYONE had any luck dealing with GM when their car was out of warranty?

bartsky

I have seen quite a few post on here with grand sport owners with the same conditions and it was a plug wire coming off I believe.

919cw313

Not uncommon for GM to do goodwill repairs on a 5 year old car, but 7 or 8 would be unheard of.

Vet Interested

Remove your fuel rail covers and check for a plug wire off at the coil. I had the same issue. Number 7 cylinder wire had come off.

TorchRedFred

I agree with the posts above. It should be an easy fix of reattaching spark plug wire.

96GS#007

If you have no compression then it's not a plug wire. Did you verify via a compression test or are you just throwing out a term you heard?

- reattach plug wire....free
- no compression...$$$$

alain1601

Yes, most probably the problem: https://www.corvetteforum.com/forums...post1595085182

jrose7004

My 10 Grand Sport blew the motor with 34,000 so I feel your pain. GM offered nothing but an apology!

Not So Fast

I assume you had it fixed Rose, what was the culprit if you don't mind telling??
NSF

jrose7004

Yes, I got a GM crate motor. It was the bearings let the crank move forward and grind into the block. I asked to see it but they had crated up the old motor and wouldn't open it back up so I really don't know.

Not So Fast

Any pre warnings or just happened ??

billyboy47

Pretty inquisitive for an old man.

Ahrmike

Very rare to have compression just "go out" while driving with no prior symptoms. If it is a lack of compression, id suspect you ingested something thats leaving a valve open..or a valve spring/rocker arm is broken. Especially if you didnt hear any catastrophic noises prior. Check the plug wires as previously suggested. Pull a plug, see if theres metal deposits on it.. Pull the valve cover, see if there are broken springs or rocker arms.

jrose7004

No pre warnings. It was running great, no noise, no rattles or smoke. It just quit. Had metal shavings in the oil pan.

cmonkey713

Good luck with getting any participation from GM, it probably won't happen.

Not So Fast

Damn, hate to hear that, but all good now, what did it set you back ??
NSF

Johnathon59

So if I understand the op correctly, He had an oil change done at the dealership & on the way home from that dealership about a block away the engine fails for apparently no reason !! ...HMMMM ... something the dealership did or failed to do possibly ?? hard to believe that a LS3 engine just fails like that.....

jrose7004

$8,800.00.

Joe1968ny

Any follow up here? Curious to hear what the op found

Ahrmike

wow, i missed that. Yeah, very rare if its "coincidence". Some tech forgot to add oil? Dont know why it wouldnt throw a low oil pressure light if that was the case though...