en4yo

Not to long ago I installed cold air intake and magnaflow catback exhaust. Now my car is producing a back firing sound after I initially start the car and rev it up. I am running 87 octane and have changed my fuel setting and MAF curve to 5% it's not as bad but it still makes the noise. I am trying to figure out if I am doing something wrong or if I need to keep adjusting.

GrayPony

You need to get a professionally written tune for your intake or datalog and have a qualified tuner adjust the current tune to correct the problem.

Nuke

+1

What brand/model CAI and whose tunes are you running (or ARE you running a custom tune)? Most CAI's worth a darn require a re-tune to make any useful power and those CAI's that don't require a re-tune may still throw a CEL for running lean.

Check out the AM and Brenspeed websites.

Whitehorse10

This is why I don't buy used Mustangs unless it was a dealership demo model.

amustangrocks

all the 4.0`s kinda do that popping thing coming off a rev, its just the nature of the beast. just quit revving it up high in park or neutral, its not good for the engine anyway.

Whitehorse10

Mine has never done it.

rls82959

Mine doesn't either.
Now my car is producing a back firing sound after I initially start the car and rev it up.
OP are you revving a cold motor? Don't do dat.