Jump to content
SAU Community

Decel Backfire

dmonic1

By dmonic1,
in Four Door Family & Wagoneers

 Share

Recommended Posts

dmonic1 Community Regular

dmonic1

Posted
Posted

my car has all of a sudden started to backfire or pop while decelerating. it normally happens while just cruising on the speed limit or so and when i back off for reasons like traffic or coming up to a corner the car will occasionaly give a lttle pop out the exhaust. its nothing loud like the old key bangers i used to do to scare the shit out of pedestrians in the sigma but i was just wondering why it would just start happenening. i fitted the new turbo and front mount a month or so ago so the only reason i can think of is because its so cold at the moment. i adjusted the blow of valve so that it is at its hardest setting but it is a plumb back anyway.

Link to comment
https://www.sau.com.au/forums/topic/228556-decel-backfire/
Share on other sites
bluesky4me Community Regular

bluesky4me

Posted
Posted

Mine does the same thing..more so when its in triptronic mode..mine has a big exhaust and Blow off.From what I know it does this as a result of running rich and the poping is unburnt fuel..it can also be a result of a worn out O2 sensor I believe. I dont think it is a major cause for concern...sounds cool...but..the thought of using more fuel than is nessesary..aint a good one.

Link to comment
https://www.sau.com.au/forums/topic/228556-decel-backfire/#findComment-4020867
Share on other sites
Xmetal Mentor

Xmetal

Posted
Posted

All it would be is unburnt fuel going out the exhaust, mine used to do it all the time particularly if I go up it then threw out the anchors straight away.

Gut your cat converter and watch for the flames....and the police. :P

Link to comment
https://www.sau.com.au/forums/topic/228556-decel-backfire/#findComment-4021212
Share on other sites
dmonic1 Community Regular

dmonic1

Posted
  • Author
Posted

yeah i was thinking i might have a small air / vacume leak somewhere as when i boost it i get a little whistle from somewhere other than the normal boost noise. i already have a decat pipe and i have been told that i pop flames on up changes when it tickles the limiter.

Link to comment
https://www.sau.com.au/forums/topic/228556-decel-backfire/#findComment-4021294
Share on other sites
GoldZilla Grand Master

GoldZilla

Posted
Posted

It's just un-burnt fuel, and it shouldn't be an issue. When you back off the accelerator, some of that extra fuel might still go through the engine, and when it reaches the exhaust the high temperatures cause small explosions in the exhaust manifold and dump pipes, etc.

Link to comment
https://www.sau.com.au/forums/topic/228556-decel-backfire/#findComment-4023247
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Latest Posts

    • turbo76lx
      Torana Lx Gtr Hatch, Lots Of Pictures

      By turbo76lx · Posted

      Things are happening.  
    • The Bogan
      NC MX5

      By The Bogan · Posted

      The spray cans were in the "Kiln" room whilst I was preping the parts,  so probably around 2 hours to get them warmed up, the kiln room has 3 small ovens running at 100°c, 3 medium sized ovens running 100°c, and the large one I used running at 80°c, the room itself was about 28°c, I also spent a bit of time taping up the parts in the room as well, and by the time I was done I would assume that the parts were around that 28°c As for power, I expect a couple of Killerwasps up high would be achievable with the current mods, I'm still running the MZR 2.0 intake and throttle body, and there is a slight mismatch with the 2.0 intake (smaller) and 2.5 intake ports (larger) on the head, this intake is matched and specifically designed to fix this issue with the ports mismatch, the throttle body is also a couple of mm larger, OEM is 65mm, the Bosch is 68mm In the end it will look "prettier" than the molded plastic thing that is the OEM MZR 2.0 intake As for the LSD, it's the OEM Torsen which works fine for what I use the car for, plus, basically no maintenance apart from the occasional oil change
    • Pac
      The New Official S A U - N S W Spotted Thread

      By Pac · Posted

      I was at Tunehouse in Marrickville (great team over there really know their VR's) , and I spotted this Very clean R35.  
    • Pac
      Who has a Infiniti Q60, Q50 (V37)?

      By Pac · Posted

      Mate , I have the same issue right now with the exhaust noise , if you can tell me what your local guy did , I'll talk to my guys and see if they can do the same. Power is good but it just too loud when put it down. 
    • Komdotkom
      NC MX5

      By Komdotkom · Posted

      The other trick I've found with wrinkle black is to put the can in hot water for a bit to warm the paint up, and to pre-heat whatever you're painting. It'll be interesting to see if you pick up any power with the intake, following with interest. Got a proper lsd for this?
×
×
  • Create New...