wen i let off the petal at WOT it bak fires??? what is causing this?? jus installed new aftermaket header and exhaust...didnt do it before

 

I see boosted cars do this allot, Is it bad

 

mine is nowhere close to boosted lol jus bolt-ons intake headers and exhaust...could it be cuz its running really rich?? cuz it smells real rich??? idk?? help plz!

 

yea, I think that's why, My brothers Nova does this, it's because the hot exhaust pipes ignites the gas that collects on it.
Might be one of your cylinders isn't getting spark, and that could be how the gas gets their.
I have no idea how to fix a car that runs rich if it is not carb.
I've asked here before and got no responses.

 

i heard somthing about the spark plugs. if u gap em to far or somthing like that itll backfire

 

the reason it backfires in the exhaust is cus either your have a small leak in the exhaust which sucks air in on decel and ignites the excess fuel or your runnin so rich that it hits a hot spot in the exhaust and ignites itself. its nothing to worry about except if it gets too much fuel in the exhaust (constant cranking but no spark) that you can make your muffler a bomb haha. ive seen it happen with a muffler and an oil pan.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by innes887 &raquo;</TD></TR><TR><TD CLASS="quote">the reason it backfires in the exhaust is cus either your have a small leak in the exhaust which sucks air in on decel and ignites the excess fuel or your runnin so rich that it hits a hot spot in the exhaust and ignites itself. its nothing to worry about except if it gets too much fuel in the exhaust (constant cranking but no spark) that you can make your muffler a bomb haha. ive seen it happen with a muffler and an oil pan.</TD></TR></TABLE>
hahahaha thanx ima try to regap the plugs and hope it doesnt blow my oil pan up
thanx for the input!

 

hahah sounds good. let us know what color the plug tips are cus that can tell alot about an engine. hahah and dont worry about the oil pan problem, it was an old monte carlo that was carbd and he flooded it so bad that it went past the rings and gatherd in the pan. then it finally started and KABOOM!!!!

 

they are white and i had oil in the #4 cyl. but fixed that oil problem

 

white is lean=real bad.

 

i have the 02 sensor on the #4 cyl header outlet or whatever its calld, and i heard if i take that one off and put it to the plug before the cat, it will correct the mixture?
is that correct??

 

white can also mean coolant too. well if the number 4 cyl is buring oil it will coat the o2 and cause improper readings but if you put it before the cat like you said it may correct it slightly by not directly getting it fowled by oil. hows your idle and driveability

 

my hatch backfires like crazy because of how rich it runs... its crazy it shoots flames like a foot out my side pipe

 

the idle is allright its kinda up and down between 5oo and 900 bt sumtimes it acts like it wants to die