Backfiring under load !!! - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 5 (permalink) Old 05-01-2018, 11:49 AM Thread Starter
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Backfiring under load !!!

So today I took out my 66 out for the first drive after winter storage and I'm at my Witts end ! I put the car in storage for the winter running like a champ, now the idle is a little rough and it backfires when I put my foot into it. I changed the cap and rotor thinking maybe it was cracked over the winter somehow difference.

Last year I put on a new Edelbrock 650 thunder series carb , plugs might have 10,000 miles on them, nothing has changed from last year .

I'm thinking maybe some new plugs and wires ?

any input will be appreciated

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post #2 of 5 (permalink) Old 05-01-2018, 03:02 PM
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Re: Backfiring under load !!!

Did you put any fuel conditioner like Sta-Bil in the tank? How about some HEET? I'm originally from Minnesota, and know what cold weather can do to gas tanks/fuel lines/fuel filters.

1965 Ranchero Deluxe 66B
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post #3 of 5 (permalink) Old 05-01-2018, 03:10 PM
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Re: Backfiring under load !!!

Give the carb a good cleaning. Bet some of the gas might of gelled up over storage, it can be a pain. I usually run a tank of with a stabil mix before putting my car away for the winter. Usually runs great after the winter.
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post #4 of 5 (permalink) Old 11-08-2018, 01:17 PM
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Re: Backfiring under load !!!

Sounds like partially clogged jets causing your engine to run lean. I used to get a lot people with the same problem when I was a motorcycle/jet ski mechanic. Always came back at the beginning of the season with the problems you describe and almost always were due to bad gas, clogged jets, etc. ALWAYS use a fuel stabilizer if you even think you won't drive/use your fuel within 30 days.
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post #5 of 5 (permalink) Old 07-31-2019, 06:58 PM
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Try sea foam in the carb.

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