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Old 09-07-2010, 12:49 AM
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Back Fire through Carb

I work as a dispatcher and drive a 1971 F250 xlt ranger camper special. Basket case when I got it. I recently had the carb rebuilt and the exaust manifolds changed. New plugs, wires , cap , rotor, condensor, and points.

It back firing through the carburator at cruising speed. Runs great at first and a mile or two into a drive and when you get on it at about 2500 rpm it looses power and backfires through the carb. Anyone have any ideas?

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Old 09-07-2010, 11:26 PM
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looks like the only thing you didn't change was the coil. That might be it.
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Old 09-08-2010, 02:42 AM
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Valve springs could be roached.
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