Ok, What does it mean when you hit the gas, your 350 mild build small block with a holly 600 CFM Double Pumper runs ok, then when you release the pedal and coast your engin starts backfireing in your exaust.
I think it means my idle metering screws are set to rich. What do you guys think?
GUYS, I'VE BEEN LOOKING FOR THAT DECELERATION BACKFIRE SOUND FOR YEARS! SCARES THOSE IMPORT KIDS AT THE LITE WHEN YOUR COMING TO A STOP, I GUESS THE QUESTION IS IS THIS HARMFUL TO ANY THING, BECAUSE IF ITS NOT, YOU'L HERE ME COMING!
Beattie z28 is right, if you have a smog pump with bad 'check valves' it can backfire pretty loud sometimes on decel. Also check for an exhaust leak pulling in fresh air, keeping your exhaust burning in the pipes.