Why is my truck backfiring?


Asked by Jan 24, 2014 at 08:14 PM about the 1973 Ford F-250

Question type: Maintenance & Repair

I got a new break booster and put it on, then replaced the transmission filter. Ever since
I've done this, this extremely loud backfire comes from the left exhaust pipe. I don't know
what's going on with it

2 Answers


Check if you have an A.I.R. system (smog pump). If so, you may have accidentally disconnected the vacuum hose from the diverter valve. I'd strongly suspect this if it only backfires when you take your foot off the gas pedal. HTH. -Jim

1 out of 1 people think this is helpful.

Check your plug wires or spark plugs on that side. You may have pulled one off or cracked the porcelain on the spark plug installing the booster.

2 out of 2 people think this is helpful.

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