backfires and pops
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,146
Likes: 31
From: Minot North Dakota
St. Jude Donor '12-'13-'14-'15, '21
backfires and pops
just had headers, cam, CAI and tune done on a 2013 427 vette.. I can tell the difference in power by the seat of the pants feeling, however dyno was 630 at the crank. My issue is it backfires and pops when changing gear and deceleration. I’m used to some gurgling on decel but this is like firecrackers going off like gurgling , pop, BAM!!!
I heard that backfires and gurgling is due to excessive gas not being burned properly, is that correct, Can that be tuned out?
need some advice do I just live with it? my girlfriend is afraid its going to blow the mufflers off.
I heard that backfires and gurgling is due to excessive gas not being burned properly, is that correct, Can that be tuned out?
need some advice do I just live with it? my girlfriend is afraid its going to blow the mufflers off.
Safety Car
Joined: May 2011
Posts: 3,582
Likes: 46
From: va
Its part of the overrun. DFCO (decel fuel cutoff) controls how this works.
I removed my dfco and it does it a lot more now which is pretty cool when you know its not hurting the car.
Note: dfco affects engine braking - removing dfco takes a bit out which helps stabilize the car at corner entry... some race teams play with this to adjust the cars characteristics...
I removed my dfco and it does it a lot more now which is pretty cool when you know its not hurting the car.
Note: dfco affects engine braking - removing dfco takes a bit out which helps stabilize the car at corner entry... some race teams play with this to adjust the cars characteristics...
"AlohaC5" Senior Member
Joined: Jun 2003
Posts: 3,562
Likes: 44
From: Madison, AL
Back firing is not normal. I agree, the new tune needs to be checked. Was this a mail order tune or was it done on a dyno and street? The "gurgle" is normal, but you shouldn't be getting a loud pop or BAM. If you don't have a local tuner, I can recommend an excellent tuner that can help you with your issues, via mail. Mike
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,146
Likes: 31
From: Minot North Dakota
St. Jude Donor '12-'13-'14-'15, '21
No mail order, Doug from DRM in Minnesota did it. He told me to send the ECM to him and he would fix it, I’m just not sure how to get it out of the car.
Drifting
Joined: Jan 2005
Posts: 1,827
Likes: 301
From: Tucson Arizona
St. Jude Donor '08
Have the shop that dynoed it pull the tune and email it to DRM. It will cost a little but saves you the hassle of pulling the ECM and mailing it. Otherwise it is in the front passenger side wheel well. You can do a search on this forum for Corvettes of Westchester and he shows where and how to remove it.
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Le Mans Master
Joined: Jul 2005
Posts: 7,405
Likes: 353
From: New Castle Del.
St. Jude Donor '09
backfires and pops
Originally Posted by el es tu
Its part of the overrun. DFCO (decel fuel cutoff) controls how this works.
I removed my dfco and it does it a lot more now which is pretty cool when you know its not hurting the car.
Note: dfco affects engine braking - removing dfco takes a bit out which helps stabilize the car at corner entry... some race teams play with this to adjust the cars characteristics...
I removed my dfco and it does it a lot more now which is pretty cool when you know its not hurting the car.
Note: dfco affects engine braking - removing dfco takes a bit out which helps stabilize the car at corner entry... some race teams play with this to adjust the cars characteristics...
Safety Car
Joined: Nov 2006
Posts: 3,667
Likes: 159
Sooo, I now recommend to double check that you have no leaks in your exhaust first, before messing with the tune
Burning Brakes
Joined: Jul 2013
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2023 C7 of the Year Finalist - Unmodified
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Mine will backfire and pop on deceleration in gear. Was tuned on the dyno. But I have noticed if the a/c is running it will not backfire or pop at all.
Intermediate
Joined: May 2008
Posts: 43
Likes: 0
From: H-TOWN You know where!!
How do you remove the DFCO? I see a lot of variables in HP Tuners. But nothing specific on removing DFCO.
There is no like ON or OFF selection.
There is no like ON or OFF selection.
Its part of the overrun. DFCO (decel fuel cutoff) controls how this works.
I removed my dfco and it does it a lot more now which is pretty cool when you know its not hurting the car.
Note: dfco affects engine braking - removing dfco takes a bit out which helps stabilize the car at corner entry... some race teams play with this to adjust the cars characteristics...
I removed my dfco and it does it a lot more now which is pretty cool when you know its not hurting the car.
Note: dfco affects engine braking - removing dfco takes a bit out which helps stabilize the car at corner entry... some race teams play with this to adjust the cars characteristics...
Last edited by cowboyup; May 19, 2015 at 10:49 PM.
Le Mans Master
Joined: Aug 2009
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From: Chester County Pennsylvania
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just had headers, cam, CAI and tune done on a 2013 427 vette.. I can tell the difference in power by the seat of the pants feeling, however dyno was 630 at the crank. My issue is it backfires and pops when changing gear and deceleration. I’m used to some gurgling on decel but this is like firecrackers going off like gurgling , pop, BAM!!!
I heard that backfires and gurgling is due to excessive gas not being burned properly, is that correct, Can that be tuned out?
need some advice do I just live with it? my girlfriend is afraid its going to blow the mufflers off.
I heard that backfires and gurgling is due to excessive gas not being burned properly, is that correct, Can that be tuned out?
need some advice do I just live with it? my girlfriend is afraid its going to blow the mufflers off.
Safety Car
Joined: May 2011
Posts: 3,582
Likes: 46
From: va