Muffler Popping... whats the deal???

[sohc90adel]

Ok... its kinda pissing me off already, the muffler is constantly pooping all the time. The car runs good once i press the gas, at idle the air that goes through the muffler is not constant, its more intermittent. I did not pass inspection for the car so im worried. I have bought all the sensors and changed all filters and plugs and wires i just dont get it. Do you think its the catalytic? Its a high flow. I just dont get this problem anybody have this problem????

[USsil80]

what about the air pump is that still good and spinning fine...

[sohc90adel]

air pump?

[Supafly]

generally a hole/leak in the exhaust will cause popping on deceleration.

[sxse]

timing...

check that...

[navysnail]

is it a back-fire/misfire pop, if so, then it is probobly timing like sxse said.

[USsil80]

yea the air pump that pumps air into the zoust

[USCS14DUDE]

I have a similar problem with mine, when i'm decelerating and rpms drop below 2500 it pops. I know my problem is a lack of back pressure, i have header and 2 1/4 piping. Mine is not to bad, what rpm range does yours pop through?

[sohc90adel]

i am going to check the timing this weekend i hope its just that.

do you guys really think because of the lack of back pressure it would pop? i have seen 240s with 3 inch piping and no cat that dont pop(really loud though).

how can i check for leaks i know i dont have broken piping thats for sure.

do you guys think if its the timing that thats why i didnt pass inspection?

[MikeMurphy]

Poping is just the combustion of unburnt fuel in your exhaust. Your car can be running a bit rich for a number of reasons. For some reason the KA is just prone to too much fuel upon deceleration. It happens to mine all the time.

Why did you fail inspection?

[USCS14DUDE]

you probably failed inspection because you have header and high flow cat installed. I have hotshot header installed and failed in NC.

[sohc90adel]

so i dont know why i didnt pass? all i know is that while it was running at the test it would bog a little but the rpms were fine. its just weird i hope its the timing, if the timing is advanced it will run rich right?

[MikeMurphy]

I dont think ignition timing has anything to do with how much fuel the injectors put in. Well, very little anyways. I can set off car alarms with the poping in my tailpipe, and I still passed emissions, barely.

You should probably find out why you didnt pass inspection so you can know exactly what to fix.