my 1980 F-350 back fires, solutions?
she only has 93K miles and runs nice but does back fire, this week I am changing plugs,
cap. rotor, maybe wires.
tune up...like you said..
keep the plug wires apart also.. crack in the cap...
If it only backfires when you let off the accelerator or about 3 seconds after you turn off the engine it's the diverter valve for the A.I.R. (Air Injection Reaction) system, if equipped. AKA the "smog pump system". HTH. -Jim
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