sometimes when i rev it, especially cold, the car beckfires out of the exhoust or someting. I got a 3" cat back. Is this normal?

 

Just after I disconnect and reconnect the battery

 

yea i get that...only when cold tho.

 

It's not "backfiring" it's unburned fuel in your exhaust exploding.

 

mine does it all day long, gets pretty loud with the cutout open.

 

First of all, if it is coming out of your exhaust it is not a "backfire". A backfire is exactly that - back-fire. This means your intake charge is shot back up through the intake, ignited or not.

 

check you're plugs.

 

Yep, with my cutout its normal....I worry not.

 

my car does the same thing in the morning when i first start it up and give it some gas, but once it is warmed up it is fine. 3 in flows? might have something to do with it

 

It's just an exhaust crackle....nothing even close to a backfire.

 

Due to factory programing (cold fuel enrichment) your vehicle is not stumbling coughing or hesitating (carb era vehicles ran like crap cold) The engine runs excelent cold due to excess fuel. the only side effect is the burning of the unburnt fuel in the exhaust.
I put headers (flp) hi flow cats (flp) and 4'' back w/spintech muffler on 2000 T/A ws6 that car poped hard on decel much worse cold.

All in all enjoy the wicked exhaust note of your car I love the sound of the LS-1 (including the morning wake up pop the neighbors love it too)


John Pontiac Service Mgr.

 

I had a carb'd car and it ran perfect hot or cold. Started right up with the turn of the key, zero cranking time, even on 0 degree days.