tmajikman

I just wanted to find out what some of the main causes wouldbe tomy stang backfire. It only seems to do it at higher rpms and it does not matter what gear I am in.

5.slow33

mine does it to but i run with no mufflers so u can hear it real good but only does it wents its cold not to much when its warmed up

aode08

cold air intakes - MAF, CLEAN IT.


check fuel pressure n tps voltage

tmajikman

I do not have a maf yet, but I can look into the tps voltage, what about the timing, or possible beinga tooth off. btw, it happens aroung 4500 rpms, but not all the time.

Black95MustangGT

check out that timing, maybe bump it or knock it down a bit?

dimebag

dude, mine does the EXACT same thing, lol. not all the time, but some times right? no matter what gear.

we gotta figure this **** out!!!

tmajikman

Exactly right dimebag, it does not do it at any specific time, rpm or gear. It just does it out of the blue. What the hell.

AdderMk2

more than likely due to a fuel trim issue, and carbon build up in the cylinders/heads....

noy much you can do about it without tearing the motor apart and giving it a good cleaning

fattony

think i read this somewhere else on the forum but do you have an offroad x/h pipe and still running the smog pump? the air still being pumped into the back of the cylinder heads causes it to backfire. maybe someone can back me up on this?

AdderMk2

I have also read this. But I have to experience with it, since my smog pump came out shortly after my X pipe went in.