what causes kickback on D-4 engines.

kickback? you get recoil from a engine??

Hmm? not even a car reference on Wikipedia....we'll need some clarification here: Kickback may refer to: Kickback (bribery), a form of bribery The recoil from a firearm Kickback (chainsaw), when the force on the saw blade throws it back towards the user The sports section of the long defunct Channel Four Daily A variant of the Blackwood convention in contract bridge Kickback (Transformers), a character from the various fictional Transformers universes The NATO reporting name for the Kh-15 (missile) Kickback (band), a French hardcore band Kickback (album), a collection of rare and unreleased material from the funk group The Meters American English Slang for a tip given after a meal like at a restaurant or for Chinese delivery American English Slang for a get-together or party of close friends American English Slang for the state of being relaxed and chilled- out sometimes in the La-Z-Boy reclined position, reminiscent of the 1970s era colloquialism KickBack.no, a Norwegian cashback website.

BWahahahah! I think OP means either back firing, (which is SERIOUS on a modern Coil-over ECM type engine), or hard shifting. Is it AWD?