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Car Backfiring After Extrators installed
Posted: Mon Mar 24, 2014 7:48 pm
by angusis2fast4u
About a week ago i installed a new cat back system to my na6 and it didn't change anything (in regards to backfiring). yesterday i installed extractors and on deceleration the car now backfires. they aren't extremely loud backfires but are noticable. During the install i reused the old o2 sensor.
What could be wrong?
Re: Car Backfiring After Extrators installed
Posted: Mon Mar 24, 2014 8:09 pm
by hks_kansei
How big are the backfires? gunshot style, or just a light popping and rumbling on overun.
MX5's run fairly rich standard, and can tend to make a few rumbles and pops etc when you give the exhaust the opportunity.
Mine has OEM headers, OEM midpipe (inc OEM resonator) an 80cel cat, and a straight through muffler.
Cold overun it rumbles and pops and carries on, when hot it will make decent bangs during a gearchange.
And also when hot if I tap the throttle I can get it to make a pretty good whipcrack.
Re: Car Backfiring After Extrators installed
Posted: Mon Mar 24, 2014 8:37 pm
by fastfreddygassit
air leak from a gasket (flange, manifold, etc) not sealing properly?
Re: Car Backfiring After Extrators installed
Posted: Mon Mar 24, 2014 8:46 pm
by angusis2fast4u
As long as it's rich not lean haha
It's just little pops not anything like a gun and only on deceleration that I've noticed.
Also gaskets are new and tight :/ shouldn't be
Re: Car Backfiring After Extrators installed
Posted: Mon Mar 24, 2014 9:14 pm
by manga_blue
If it's backfiring into the intake manifold then it may be indicating an exhaust blockage. Backfiring into the exhaust is pretty common with our cars - rich mixture usually.
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 12:18 am
by ralt
Hi.
Do you have a resonator in your system? If you have you should not have any pops etc if no resonator you will have them.
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 10:27 am
by project.r.racing
ralt wrote:Hi.
Do you have a resonator in your system? If you have you should not have any pops etc if no resonator you will have them.
wrong.
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 10:47 am
by sailaholic
Agree if got a resonator and muffler and I get pops bangs a plenty.
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Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 1:20 pm
by NitroDann
+2.
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 1:44 pm
by brendanstacey
For diagnosis,
Backfire = Ignition in Intake
Afterfire = Ignition in Exhaust
You have Afterfire.
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 4:38 pm
by angusis2fast4u
brendanstacey wrote:For diagnosis,
Backfire = Ignition in Intake
Afterfire = Ignition in Exhaust
You have Afterfire.
Thanks for clearing that for me, never knew the difference, yeah definitely afterfire
ralt wrote:Hi.
Do you have a resonator in your system? If you have you should not have any pops etc if no resonator you will have them.
Nup no resonator, high flow cat and muffler only
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 4:51 pm
by bruce
I'm a bit like that after a can of beans...
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 5:10 pm
by hks_kansei
angusis2fast4u wrote:Nup no resonator, high flow cat and muffler only
That'd do it.
It's pretty normal, I wouldn't be concerned.
Re: Car Backfiring After Extrators installed
Posted: Tue Mar 25, 2014 5:41 pm
by angusis2fast4u
hks_kansei wrote:angusis2fast4u wrote:Nup no resonator, high flow cat and muffler only
That'd do it.
It's pretty normal, I wouldn't be concerned.
Thanks HKS
Re: Car Backfiring After Extrators installed
Posted: Sat Apr 26, 2014 3:37 pm
by TurboDoseBro
If you can get flames to shoot out I want part in this!
