Anyone ever backfire?

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Old 03-11-2008 | 10:43 PM
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bent09's Avatar
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From: Katy, TX
Anyone ever backfire?

Just curious.

The wifey and I were out on a date and I got on it getting on the freeway.

I let off and it was almost like the car backfired. I know I am not explaining it well but it seemed as if I would have stayed on it it would of popped.

I noticed it once before the SC but jst played it off.

I recorded getting on it via my gauges and it seems the boost was at 6 psi and the AF was around 10-11.

Any thoughts?

Is it my cats?
Old 03-11-2008 | 10:46 PM
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Mine backfired once, same situation, floored it and right when I took my foot off the pedal it made a slight backfire sound.
Old 03-12-2008 | 12:04 AM
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yea i get intake backfires....when i installed my intake i took my TB off and it was all black...prolly isnt too good, oh well. haha
Old 03-12-2008 | 01:11 AM
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Backfire.. like flame coming out of your exhaust pipe backfire?
Nope--not me. Not yet. But it's still stock... for now. =]
Old 03-12-2008 | 01:18 AM
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ive had this happen to me also (not on purpose)..it usually happens when the engine hasnt warmed up yet. try not pushing it too hard right after u turn it on and its cold out..especially if its been siiting for awhile
Old 03-12-2008 | 01:56 AM
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hey Bent you have the ATLp right? cause mine does it too! lol...sometimes....usually like at mid rpms....i just tap the gas lightly then it does a popopopopopopo sound...more like a gurgle
Old 03-12-2008 | 07:49 AM
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I get backfires between 3rd and 4th wot shifts... after exhaust install... no biggie
Old 03-13-2008 | 11:19 PM
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Inaccurate's Avatar
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Engine backfire? (click here)
AEM intake problem !! (click here)
Pop shifting from 2nd to 3rd (click here)
Old 03-14-2008 | 06:47 AM
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i was gonna ask that question too!!
lol

after i installed the Greddy EVO2s almost everytime the car shifts or when i left of throttle (5AT) i would here a pop.pop.pop. sound...from the back of the car.. like back-firing sound.. but no flames... well at least yet...

i think that is normal.. btw.. i am running CT Supercharged.. so i dunno if that is causing the back-fire sound
Old 03-14-2008 | 08:37 AM
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From: New York City | Stuck in Traffic
tidus... 1 pop or multiple pops? cuz I get 1 pop... everytime in the same rpm...
Old 03-14-2008 | 09:51 AM
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From: T-dot O, ON
Originally Posted by stillhere153
tidus... 1 pop or multiple pops? cuz I get 1 pop... everytime in the same rpm...
usually itz one pop... well... rpm wise... anytime under load then lift... and... full throttle up-shift =)... one pop..

if you do down shift on auto.. you might get like 3 pop.. not that loud
Old 03-14-2008 | 11:13 AM
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From: New York City | Stuck in Traffic
nah I dont get any pops on downshift... always on wot upshifts... I think it is the butterfly though... or could be the exhaust has us running lean... causing after fire
Old 03-14-2008 | 02:00 PM
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nah man.. not the lean part i think!! someone remove all the cats and see what happens! lol... backfire time.. running rich will get u back fire i think!

wellz... at least thats the case when i track with my track car with NO CATS lol
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Old 03-15-2008 | 01:17 AM
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From: New York City | Stuck in Traffic
yeah I may remove all the cats if they fail...
Old 03-15-2008 | 08:59 AM
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I've had it before and kinda scared me( probably the person I was passing too :P)
I think that was when I took it in and had to get that ECU flash because I believe the 3rd cylinder was firing on time. This was about a year..year 1/2 ago
Old 03-15-2008 | 02:13 PM
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Have I ever !!!
It chased 2 passengers out on 1 occassion.

Old 03-15-2008 | 05:46 PM
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wait.. you know what guys... go check out that EVO2 dyno video... when he let off the gas.. it backfired (sound wise)
Old 03-16-2008 | 02:29 AM
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From: New York City | Stuck in Traffic
^ interesting I am going to check it out when I get home...

I think it is exhaust related... a few weeks back I put the car on a lift in neutral and had a friend rev the gas to see if I felt any air to the touch... nothing around the gaskets... just some sexy sounds
Old 03-16-2008 | 11:37 AM
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Mine did it a while ago. Drove to IHOP, after 45 minutes left, pulled out hit gas and backfired shifting from 2nd to 3rd at almost WOT. Took it to the dealership...They checked it, all ok, said sometimes the computer farts and it happens.

Hasnt happened again.
Old 03-17-2008 | 08:37 PM
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Once in a while after I installed the AEM. Ususally between 2nd and 3rd when pushing relaly hard. Less after putting on the comptech CT.
Old 03-19-2008 | 07:20 PM
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If you do a search under 'backfire', you'll find several threads that discuss this phenomenon. JDM5lugHatch provided the following credible explanation:

"This problem is caused by the combination of being an Automatic and Drive By Wire. I could repeat it not stop in my TL when I had it. Full Throttle in i think it was 2nd gear and bump it up to 3rd gear at around 6k staying on the throttle. It would do it damn near every time. The addition of an intake amplifies the sound. It did it to me 1 time when the car was stock with the factory intake. However, like clockwork with the addition of the intake. The throttle plate is slamming closed to prevent a full throttle shift to the next gear (limit power) then it opens really fast so you get this backfire type sound through the intake system.

So all in all it's normal and not causing any problems!"
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