occasional backfiring

**slpdablueZ28** · 11-29-2009, 09:09 AM

when im driving my car and i gun it, it backfires on me every once in a while. sometimes its at wot, sometimes im just cruising and decided to give it a little more juice and itll pop and keep going. any idea what it might be? could it be spark plugs again cause i havent changed those in 2 and a half years

**bills98ta** · 11-29-2009, 09:59 AM

You are loosing spark somewhere... Get new plugs and wires, and hope that fixes it !

**slpdablueZ28** · 11-29-2009, 11:30 AM

yeah thats wat i thought the problem might be too seeing as i having touched them in a while

**0rion** · 11-29-2009, 01:39 PM

could also be fueling related. Would be nice if you could log the car and see what's going on. Do you still have your stock maf laying around? Try putting that back on and see what happens. Check for vacuum leaks also.

**SOMbitch** · 11-29-2009, 02:04 PM

I am with^^^^ Plugs usually cause a misfire not a pop... You sound lean which can be FP or MAF.....

**Goldcuffs** · 11-29-2009, 06:10 PM

Is it popping through the intake or out the exhaust? As stated above a misfire and backfire are caused by different things.

**SteveC** · 11-30-2009, 04:04 AM

You are passing raw gasoline through the exhaust valve, and it is igniting with the hot exhaust.

SteveC

**bills98ta** · 11-30-2009, 05:08 AM

I had a damaged reluctor ring on my new build... Fireballs 5 feet behind the car from the open headers !!! Sounded like an elephant cannon going off... At high RPM's, it would kill 4 coils... Took a while to figure that out...

**0rion** · 11-30-2009, 08:09 AM

I was thinking....the last backfiring car I messed with was a buddies vette and his ended up being a dead O2.

**bills98ta** · 11-30-2009, 01:14 PM

Could be anything, so I'd start out with the plugs and wires. Going to need them anyways !
HP Tuners would be nice for the scanner and logging... Nice to see what it's doing...

**slpdablueZ28** · 11-30-2009, 06:40 PM

Originally Posted by 0rion

could also be fueling related. Would be nice if you could log the car and see what's going on. Do you still have your stock maf laying around? Try putting that back on and see what happens. Check for vacuum leaks also.

nah i dont have it laying around anymore but it sounds like it might just be the plug agian. it was doing the same thing when first got it. changed the plugs and it was running beautifully. thanks for the helps guys