will a clogged caty cause backfires?
 

my caty is clogged up on my new car and its backfiring when i let off the gas ,also my rpm wont go past 4,000 rpms and im pretty sure thats why but i wanted to make sure that that was the only thing that could cause that.please help cause im very worried that i bought a junker(so to speak)

Ignition problems can also cause that.

sorry to technically hyjack your thread here.....how bout if u go through the rpm's fine but if i left off the gas round 3000-2500 is backfire's could that be the same thing or no?

clogged cat will hold your performance down ALLOT! Mine did not cause it to only get to a certain RPM, but seemed like it took forever to get up to max RPM. Also ran REALLY quiet. No backfire from it either.

be careful!

My cat was clogged all to shit, but I still drove it because it didnt seem to harm performance too much.

I was driving about 90mph from Fargo to Minneapolis, and then KABOOM!

My exhaust literally exploded all over the highway. What was left looks like the rifles in the old Bugs Bunny cartoons when someone would stick their finger in the barrel before the shooter pulled the trigger.

At that speed, my car bounced a few inches in the air, and I almost wrecked with the semi I was passing.

Unclog it, or get a new exhaust. I dont have emissions testing in Northern AZ, so I just run straight pipes.

The performance gains without the clogged exhaust were IMMEDIATELY noticeable, but ridiculously loud.