Exhaust pop
Apr 3, 2007 | 04:34 PM
#11
It is not DFCO, it is extra fuel left over in the muffler igniting, due to the cats no burning it off (that is what they are designed to do). I have tuned several cars/trucks with no cats that popped before they were tuned. After I tuned the part throttle to the desired AFR, the popping went away ... unless getting out of it from WOT, but that only produced a small pop. Deceleration Fuel Cut Off removes timing and fuel, so the engine is only pumping uncombustionable air. 
Apr 3, 2007 | 04:39 PM
#12
Originally Posted by StrokerAce03
It will do it regardless of the muffler but more open exhaust like a straight through glasspack will amplify the sound. Like mentioned above; its the DFCO kicking in. Get it turned off in the tune if you don't like it, but it does help with fuel economy a bit.
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