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Are you talking a for-real backfire, or just a popping noise when you let off the gas? Some popping is quite normal on ANY car (aftermarket mufflers really bring this sound out). If you're hearing something that sounds like a shotgun firing though, then you could have a problem. If it's just a mild popping noise, I wouldn't hose with the mixture...
The only real way to tell if you're running too rich or too lean is to capture some AutoTap data. Cheers! <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
[ January 15, 2002: Message edited by: Nightclaw ]</p>
__________________ 2008 Machine Silver C6, Z51, NPP: Stock Best ET: ??? / Best MPH: ???* RWHP: ??? / RWTQ: ??? *: (no times yet)
I get that problem all the time, I guess its just how you are with the gas pedal, It only happens once and a while...it gets the people though if im in a public place... <img src="gr_stretch.gif" border="0">
__________________ -2009 Black Raven CTS-V (9.1"/2.55"), Airaid CAI, GT11, ID850s, SW Headers & catback, Eibachs, W4M HE, (613rwhp/606rwtq) 10.7@125 1.58 60' -2008 Jetstream Blue Z06- 550rwhp(SOLD) -2003 Electron Blue 50th Anniv. Corvette - ZO6 - (SOLD) - -2001 NBM T/A Firehawk #236 of 540 - 660rwhp - (SOLD) -
Popping when you let off the throttle can come from three sources:
1) Your air injection pump is on (normal for first two minutes of a cold start). This is causing unburnt hydrocarbons to burn rapidly in your pipes = popping noise.
2) You have an exhaust leak and/or open cutout. See cause 1).
3) You are running a large cam and unspent fuel is passing through during overlap.
Anyone know of any others?
Also, I assume you mean exhaust backfire. Something in your intake manifold can be pretty serious since it's hard to do that on an EFI engine.
[ January 15, 2002: Message edited by: WeatherGuy ]</p>
__________________ 2006 C6: Victory Red, being converted into a Lingenfelter 25th Anv. Commemorative Edition, #10 of 25, with twin turbo 427. 2004 WRX STi: Major mods, 445 WHP, 423 WTQ. About to shoot for 700 WHP and 9s with latest round of mods. 2006 Ram SRT-10 Quad Cab: Fast family and stuff hauler. 2005 Forester XT: Slower family hauler. Will be replaced with Jeep SRT-8 in April. Former car:2000 Z28, MTI 422, 10.51@135 spraying second and higher. Now in 8s with new owner.
Yeah, you are running no cats so the fuel pops when burnt. I get it, I like it, it is like a guy. What kind of a guy does not fart or burb every once in a while, hehe! <img src="graemlins/gr_jest.gif" border="0" alt="[jester]" />
[quote]Originally posted by Pro Stock John:
<strong>Open cutout Roy? Yeah that's normal.</strong><hr></blockquote>
i havent run an open cutout on the street since the converter-just too loud when reving off the line. i do have the off road pipes on though <img src="gr_stretch.gif" border="0">
can you believe i got pulled over for loud exhuast out of a toll booth with this setup <img src="gr_eek2.gif" border="0"> I told the officer that the muffler was stock (which it is). i still got a written warning though. bastard cops.
__________________ '99 Corvette FRC Nassau Blue
'07 Honda Shadow Sabre
'09 Tacoma DC TRD sport
I noticed that my car popped in the stock exhaust during deceleration with a cold engine. Now that have installed the Corsa system, the noise is a little louder. I have yet to drive with the new system and see how it is after warmup (car is off the road for winter). I think the thing is running rich until the O2s heat up and it goes into closed loop.