Bad miss?
Thread Starter
Racer
Joined: Nov 2013
Posts: 375
Likes: 62
From: lakewood ranch Florida
Bad miss?
Have a new Z51 , 125 miles, I noticed a miss at idle so I called my local dealer for an appointment which is tomorrow but in the interim I noticed that the car started to break down while driving on the interstate, very disconcerting, hope it's not a transmission issue, was wondering if maybe someone else might have had a problem like this
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,102
From: Fulshear, TX
Do you have a check engine light? If so, what's the code (press your blue OnStar button, they can tell you)?
Ideally, its just a misfire which would likely be the above scenario I guessed at.
Ideally, its just a misfire which would likely be the above scenario I guessed at.
Intermediate
Joined: Jan 2021
Posts: 27
Likes: 3
Going through the exact same issue. They changed just the spark plugs and it has gotten worse. It now backfires along with a random misfire at every rpm. No check engine light so the dealer pretty much told me to drive it home and wait until it gets worse. I escalated it with GM today and the car is waiting at the dealer for additional diagnoses.
Drifting
Joined: Nov 2023
Posts: 1,680
Likes: 1,279
This is weird if these particular cars are running that poorly but not throwing codes. I guess the dealership isn’t wrong in that they need it to trip something 🤷♂️ but it sounds stupid and who wants to run their new Corvette spitting and coughing like the motor wants to hurl it’s camshaft. And it’s embarrassing driving around like that….
“Hey!!!…Nice car!!!… When is the new engine going in?… is it supposed to sound like that?… is there a button to make the flames come out like that?…” ok probably not 🤣🤣🤣
“Hey!!!…Nice car!!!… When is the new engine going in?… is it supposed to sound like that?… is there a button to make the flames come out like that?…” ok probably not 🤣🤣🤣
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Drifting
Joined: Nov 2023
Posts: 1,680
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Just had a very similar problem with a completely different car… car came out of storage running horrible. Would barely idle. Back firing. Coughing. Just ran awful. Myself and the shop assumed bad gas, it’s four years old (even though the car ran fine, although gutless before it went into storage).
The gas turned out to be 1/3 the issue. 2/3 of the issue was a massive tear in the throttle intake boot (unlikely on a new C8) which caused the MAF to be unable to run the engine properly. New boot and it would run ok. Fill up with Super and it seems fine.
Good luck!
The gas turned out to be 1/3 the issue. 2/3 of the issue was a massive tear in the throttle intake boot (unlikely on a new C8) which caused the MAF to be unable to run the engine properly. New boot and it would run ok. Fill up with Super and it seems fine.
Good luck!
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Good luck with the diagnosis and repair of your car - as others have said, hope it is a very simple fix.
Intermediate
Joined: Jan 2021
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Melting Slicks
Joined: Sep 2020
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From: Kelso, Wa
Just a thought.
Drifting
Joined: Nov 2023
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