It never happens when the engine is cold, but on a restart the engine will produce a loud pop or backfire. It dosent do it all the time, I never know when it will do this. Has anyone else had this happen?

thanks

 

Forgot to say this is on a 09 Streetglide...

 

what mods have been done to the intake/exhaust/ECM, etc?

 

Did the Fuel Moto power package, but it would do it when it was stock.

 

might be a design quirk of the exhaust (the Thunderheader slip-on I had on my old '02 FLHR popped on decelaration). Shop said not much they could do due to its design.

Maybe give Jamie a ring so he can tweak the AFR of the map loaded in the PCIII. Best of luck.