Jeff,
Lean fuel/air mixture ratios can be one cause, but too much advanced
ignition timing, and poor gasoline are a main concern. I do not know
the load conditions on your engine, or your distributor mechanical and
vacuum advance settings.
I have been running the Pertronix system for 3 years now, and haven't
changed the plugs. I paid close attention to having the distributor
checked out, and the advance springs adjusted to get a straight line
advance between idle and 2400 rpm, where it is full-in. The vacuum
portion affects the timing only while the pedal is backed off, and the
vacuum increases.
Steve
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Steve Laifman
Editor - TigersUnited.com
Holt, Jeff wrote:
>What are the causes of backfiring. I just put in this Pertronix, but have
>not pulled the plugs yet to regap them (or clean them). Also, could the
>carburetor need adjusting?
>
>LOTS of backfiring.
>
>Jeff Holt
>Alamo, CA
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