Backfiring!

**Pappa Doo** · 09-03-2007, 04:53 PM

Just curious if anyone has an idea whats going on. Bought my 2001 WS6 TA 6spd exactly one year ago September 2nd. The car drives fine with no problems, but if I "get on it", even just a little bit, it backfires when shifting from 2nd to 3rd, and just sometimes from 3rd to 4th. It has always done it since I bought it but I never paid any attention because it drives fine. Anyone know what can be going on internally or with exaust? To maybe help, let me list a few of the mild mods.

1 5/8" headers
3" exaust (Borla) (There is no cat)
throttle body spacer
K&N FIPK Gen II filter

**nhraformula** · 09-03-2007, 09:51 PM

its because you have an aftermarket exhaust.
mine does some popping also. if no ses lite goes on, dont worry about it.

**jamessr** · 09-04-2007, 08:44 AM

I have a Borla and is does pop everyone once and awhile. TBH I don't think its and issue, so your not alone in that area.

**badazta** · 09-04-2007, 08:48 AM

check for exhaust leaks.

**timberman00** · 09-04-2007, 09:23 AM

Mine does the same thing.

**ArcticZ06** · 09-04-2007, 03:22 PM

Mine does the same but only when its not warmed up yet. I meant to ask the same question but keep forgetting to.

**Sunset T/A** · 09-04-2007, 03:28 PM

Mine does it sometimes when I first start it. I have the Borla but have only noticed this since the LongTube installation.

**timberman00** · 09-04-2007, 04:41 PM

Originally Posted by mcarse81

Mine does the same but only when its not warmed up yet. I meant to ask the same question but keep forgetting to.

That is your AIR system causing backfires when the CATS are cold. It forces fresh air into the exhaust to heat up the CATS faster and reduce emissions earlier. When the CATS are hot, the AIR system turns off.

**Spaz** · 09-05-2007, 10:10 AM

Originally Posted by timberman00

That is your EGR system causing backfires when the CATS are cold. It forces fresh air into the exhaust to heat up the CATS faster and reduce emissions earlier. When the CATS are hot, the EGR system turns off.

fixed...

doesn't have to do with that though...

when you first start your car it is in open loop... it dumpes more fuel during this time untill it goes in to closed loop...

also if you have your AC on it can make for some nice backfiring...

**ArcticZ06** · 09-05-2007, 04:08 PM

Good info to know. thanks guys!

**Ketchup** · 09-06-2007, 07:50 PM

First of all, is your borla kit adjustable or set. Mine pops a bit and I asked some dudes at MTI in houston and they said borla produces a raspier sound than other exhaust and if you have adjustable and don't like the pop, go with more restrictive plates because if you run them wide open or with no plate, they pop a little he says. Shit, after a while I kinda got into the sound.