I think I had a backfire the other day when I was getting on it. It scared me at first, but it has only happened once. Sounded like a loud pop in the intake. Haven't had it happen since. I willl keep monitoring it.
There is nothing wrong with the motor at all. I removed the air silencer because the car was backfiring before that. I thought the better it could breath, the back fire would quit. Well, it still backfires. I'm calling Ford tomorrow and see what happens.
The fuel system is control by the computer, but not when the throttle is wide open, this is safety feature that make sure that engine will not run lean, its better to have rich condition at wide open throttle so that engine will not over heat. Some of your problem can be related to injector sticking or malfunctioning fuel regulator these condition will not light the check engine light on the dash. If you did not get the check engine light to come on when these problems accured then problems can be mechanical problems. Whatever the problem the backfire is not normal and it should be looked at by the dealer. good luck
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