C7 GS Engine Backfire ???

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Dec 24, 2021 | 07:10 PM

Rags6659

Thread Starter

Instructor

Joined: Jun 2021

Posts: 100

Likes: 24

From: Lakeland, FL

C7 GS Engine Backfire ???

I have a 2017 C7 GS Automatic with 17k miles on it. Today I was driving about 20 mph and gunned the gas real hard to accelerate and the car backfired on acceleration. What the h***. I always run the super unleaded pump fuel, 93Oct. That has never happened to me before and I hard accelerate often, but usually off the line. Has anyone ever experienced a backfire on acceleration like that and what would be the cause?? The car was warmed up and the outside temp was about 60 deg. I had been driving it for about 30 minutes beforehand. Any input would be helpful. Thanks

Dec 24, 2021 | 11:06 PM

Dcasole

Le Mans Master

Joined: Oct 2014

Posts: 8,680

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From: Atlanta GA

Normal ... and fun

Dec 24, 2021 | 11:18 PM

Bill Dearborn

Tech Contributor

Joined: Oct 1999

Posts: 41,066

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From: Charlotte, NC (formerly Endicott, NY)

Probably backfired on the shift. It happens and there is nothing wrong with it. That is what you get with a performance car.

Bill

Dec 24, 2021 | 11:59 PM

jyetman

Instructor

Joined: Sep 2015

Posts: 112

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Yep happened with my 2019 gs, I smiled at myself and carried on

Dec 25, 2021 | 12:11 AM

96GS#007

Race Director

Joined: Apr 2000

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From: Texas

OP...Need more specifics as to when....ie as you shifted? As you let off the gas? During WOT....ie gas pedal on the floor?

Dec 25, 2021 | 08:27 AM

Dcasole

Le Mans Master

Joined: Oct 2014

Posts: 8,680

Likes: 2,729

From: Atlanta GA

Quote:

Originally Posted by 96GS#007

OP...Need more specifics as to when....ie as you shifted? As you let off the gas? During WOT....ie gas pedal on the floor?

I am sure it was a wide open shift as it catches everybody by surprise the first time .... its caused by the ecm cutting spark for a split nano second when the car shifts gears .......

Dave

Dec 25, 2021 | 10:54 AM

GSCE#456

Racer

Joined: Sep 2021

Posts: 267

Likes: 102

From: Prosper, TX

It just means you haven’t been driving your corvette properly all this time if it hasn’t happened before.

It’s the Performance Shift mode that happens at WOT.

I love it!

Dec 26, 2021 | 02:53 PM

spoolin03

Instructor

Joined: May 2008

Posts: 247

Likes: 63

From: CA

At least yours didn't backfire on a cold start! I probably shortened my neighbors lives' by a few years with that one

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Dec 26, 2021 | 04:33 PM

GSCE#456

Racer

Joined: Sep 2021

Posts: 267

Likes: 102

From: Prosper, TX

Quote:

Originally Posted by spoolin03

At least yours didn't backfire on a cold start! I probably shortened my neighbors lives' by a few years with that one

Try it with long tube headers! About gave my dad a heart attack.

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Dec 26, 2021 | 10:07 PM

#10

spoolin03

Instructor

Joined: May 2008

Posts: 247

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From: CA

Quote:

Originally Posted by GSCE#456

Try it with long tube headers! About gave my dad a heart attack.

Holy crap. Do your neighbors hate you yet?

Dec 27, 2021 | 08:05 AM

#11

GSCE#456

Racer

Joined: Sep 2021

Posts: 267

Likes: 102

From: Prosper, TX

Quote:

Originally Posted by spoolin03

Holy crap. Do your neighbors hate you yet?

Not yet…but it’s not a daily driver so when it is driven it’s not in the mornings when anyone would be sleeping. Plus with the NPP exhaust I am able to put it in stealth mode and it sounds like a stock exhaust until I get out of my neighborhood. Then all hell breaks loose when I open the valves back up.