What would cause engine noise on 97 dodge caravan only when ac or defroster is on and only when accelerating?
Loose belt - will sound like a screeching noise.
Will the transmission cause your 99 ford expedition bog down and sputter when accelerating 4.6liter?
What would be the cause of a film on the windshield when defroster is on after you had a new radiator put in?
Engine knock can be caused by several things. Carbon deposits in the engine can effectively raise the compression ratio of the cylinder. When accelerating, the cylinder gets filled with more fuel and air, and the higher compression ratio causes knocking. Other possible culprits could include spark plugs being too hot or your timing being off.