Huge disappointment

cdnrx1

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This has been an ongoing problem since the C6. It seems to have stopped with the 2018 C7's and does not affect all cars.
 
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LE BARON

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Not new - the letter was dated May of 2018. Special Coverage Program #17469. Might be Convertible only or early build cars. Mine was built in late August or early September of 2016 and I took delivery in early October 2016. I'm not worried about it but do keep a nostril peeled for gas odor.
Got my gears going on that letter and I received one as well.
Basically saying if you do not have a problem don't worry about it. With which I have complied....having forgot about the letter
 
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Dale124

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So, the dealership called today and after leaving the car overnight to get cold, the problem reappeared. They found the problem and will have it ready for me tomorrow. YAY!
I hope that is the end of it. I can’t remember what she said they found, but once I pick it up and get the lowdown, I shall report back.
Dale.
 

ddgermann

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So, the dealership called today and after leaving the car overnight to get cold, the problem reappeared. They found the problem and will have it ready for me tomorrow. YAY!
I hope that is the end of it. I can’t remember what she said they found, but once I pick it up and get the lowdown, I shall report back.
Dale.

Good news Dale.
They are normally pretty good in that service department. They have looked after my 3 corvettes and do a good job taking care of my H1 Hummer. They have some old school guys and some young guns in that shop, so a good combination.

You’re back on the Corvette high 👍
 

Dale124

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Good news Dale.
They are normally pretty good in that service department. They have looked after my 3 corvettes and do a good job taking care of my H1 Hummer. They have some old school guys and some young guns in that shop, so a good combination.

You’re back on the Corvette high 👍
That’s great to hear. Thanks for your feedback. I can’t wait to get back on the road, or at least back in the garage where I can watch it any time I want on the “Vette Cam”, that I installed :D
 

ddgermann

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That’s great to hear. Thanks for your feedback. I can’t wait to get back on the road, or at least back in the garage where I can watch it any time I want on the “Vette Cam”, that I installed :D

We go from “nanny cam” to “vette cam”.

That’s awesome. You are right though... many of us have been caught in the garage over the winter hanging out with our Corvettes. Planning mods or trips.... the wife opens the door with the look on her face...rolls eyes and goes back in. 😂

You are not alone. 👍
 

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by no means am i a mechanic, but its possible they filled the tank with a lower octane and THAT set off the code. not surprised in this era of tight margins and dealers trying to reduce their costs
Wrong octane level from say 87 - 93 won't turn on the MIL BUT overfilling will. Wrong octane usage is more of a long game killer and will eventually cause misfires and a rough running engine.
Hopefully whoever filled up the car stopped at the second click of the pump and didn't "Top it up". By topping it up you can actually fill the carbon canister with raw fuel and that can be sent through to your vent shut valve and bypass. If the system cant "breathe" properly it can throw a code. After driving it for a bit the level has obv gone down and that might be why the tests are coming up problem free. Either way, nothing to worry about. Super annoying after 4 days for sure, hopefully you'll be cruisin problem free this weekend Dale.
 
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ddgermann

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Wrong octane level from say 87 - 93 won't turn on the MIL BUT overfilling will. Wrong octane usage is more of a long game killer and will eventually cause misfires and a rough running engine.
Hopefully whoever filled up the car stopped at the second click of the pump and didn't "Top it up". By topping it up you can actually fill the carbon canister with raw fuel and that can be sent through to your vent shut valve and bypass. If the system cant "breathe" properly it can throw a code. After driving it for a bit the level has obv gone down and that might be why the tests are coming up problem free. Either way, nothing to worry about. Super annoying after 4 days for sure, hopefully you'll be cruisin problem free this weekend Dale.
Actually using a low octane fuel will lead to “Detonation” or “Knock” due to compression ratios mainly. Corvettes, like some other performance cars have a high comp ratio and the detonation under load using 87 is not a long term problem. It can be almost immediate if you push it. The consequences are severe for the engine.

And of course not covered under warranty. 😞
 
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Dale124

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Ok, I now have her back home, and all good.....I hope.
The tech hooked up the “smoke machine” after a “cold soak”, and found small puffs of smoke coming from a vent that is apparently caused by the “vent solenoid”. Replaces the “CVSV” and performed another pressure test...all good.
I sure hope that is it. Fingers crossed.
Dale.
 

Lootz

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Actually using a low octane fuel will lead to “Detonation” or “Knock” due to compression ratios mainly. Corvettes, like some other performance cars have a high comp ratio and the detonation under load using 87 is not a long term problem. It can be almost immediate if you push it. The consequences are severe for the engine.

And of course not covered under warranty. 😞
That goes without saying, however its only under pretty aggressive use, you've gotta be really hot rodding it. Driving it normally will do nothing, slightly aggressive will start to ping (spark knock). Straight out of the owners manual 91 is recommended but not required, nothing less than 87 is acceptable because of detonation or HEAVY knock, Thats the engine killer. Slight pinging wont severely hurt your engine. The car can be driven normally using lower octane and cause long term carbon deposits over the span of a lot of miles, I've seen it quite a bit when customers cheap out on fuel. It just doesnt burn the way its meant to.

Now this is for base model 6.0/6.2L engines only. 7.0L engines like you said - different ball game.
You can use lower octane and drive the car, it wont set a MIL was my point thats all :^) but lets be honest, why would any corvette guy/gal not go with premium!?

Dale I'm glad they got ya fixed up and back on the road. Vent shut valves are a somewhat common evap failure on most vehicles, sorry it happened so soon on yours. Don't sweat it, doesn't mean you have a lemon.
 

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That goes without saying, however its only under pretty aggressive use, you've gotta be really hot rodding it. Driving it normally will do nothing, slightly aggressive will start to ping (spark knock). Straight out of the owners manual 91 is recommended but not required, nothing less than 87 is acceptable because of detonation or HEAVY knock, Thats the engine killer. Slight pinging wont severely hurt your engine. The car can be driven normally using lower octane and cause long term carbon deposits over the span of a lot of miles, I've seen it quite a bit when customers cheap out on fuel. It just doesnt burn the way its meant to.

Now this is for base model 6.0/6.2L engines only. 7.0L engines like you said - different ball game.
You can use lower octane and drive the car, it wont set a MIL was my point thats all :^) but lets be honest, why would any corvette guy/gal not go with premium!?

Dale I'm glad they got ya fixed up and back on the road. Vent shut valves are a somewhat common evap failure on most vehicles, sorry it happened so soon on yours. Don't sweat it, doesn't mean you have a lemon.

My car has a 6.2 litre engine and the owner manual says 93 but definitely nothing under 91 or engine damage will result.
Thus I’m not relying on the computer to try and compensate for ignoring the fuel requirements for my engine.

1568251718245.jpeg
 
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Lootz

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Keyword there - Supercharged. I guess were comparing apples to oranges. Point being you can use 87 in a base engine , drive normally, and nothing will happen.

1568252587163.png
 
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ddgermann

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Keyword there - Supercharged. I guess were comparing apples to oranges. Point being you can use 87 in a base engine , drive normally, and nothing will happen.

View attachment 31304

Yes agreed. All good information.
Thanks.
 
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