Small pop sound when towing
I have a 2008 F250 diesel that I use for towing our 5th wheel a few times a month. When towing and going up a hill I give it more fuel to down shift in order to make the hill. Sometimes when the motor down shifts I hear a small pop sound coming from the engine almost like a backfire sound. Has anyone heard this also? Last time at my dealership they re-programmed the truck with a recommended Ford update but the truck stills makes the pop sound from time to time.
Thanks Eric


