my 1980 F-350 back fires, solutions?

Asked by Aug 03, 2015 at 11:13 PM about the 1980 Ford F-350

Question type: Maintenance & Repair

she only has 93K miles and runs nice but does back fire, this week I am changing plugs,
cap. rotor, maybe wires.

3 Answers

27,135

tune up...like you said..

1 of 1 people found this helpful.
27,135

keep the plug wires apart also.. crack in the cap...

1 of 1 people found this helpful.
70,295

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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