Occasionally when I rev my '94 F250 460 up to about 4,000 RPM, it will do a very minimal backfire when I let off. Is this anything to be concerned about?

 

No worries, it is just the smog pump pumping air into the exhaust, pretty common and normal.
Jimmy

 

This thread will be moved to the 87-96 truck forum as it isn't 385 engine series specific question.


Dennis

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Thanks. And mil1ion, I figured since it was the engine doing the backfiring that it would have been best to put it in here. Is that not so?