I have a restored car, everything rebuilt or new. The car has 2000 miles on it and developed a miss. I replaced the dated wires and Delco plugs and it ran so much better for a bit, now it has low power and misfire at low rpm 1200-2200 with an occasional backfire on a full throttle rev.. I replaced the points condenser with no change. The car seems to run a bit better cold as it heats up it becomes worse. Dwell/timing/ gaps all set. It has a rebuilt dual point distributor. Carb is rebuilt and has run flawlessly since new…your thoughts on an approach to diagnose this issue would be appreciated.
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Dino Lanno -
Reproduction coil, perhaps? When ignition breaks down with engine hot more so than cold, that’s makes the coil a possible culprit. -
In the thread about a Fuelie with Pertronix I wrote:
The symptoms you describe are consistent with those observed when the above mentioned failure mode occurs. To eliminate this failure as a possibility, you could (and should) disable the leading set of points, reset the dwell on the trailing set, and reset the distributor timing. Then, of course, evaluate the results.For all dual point distributors, I recommend disabling the leading set of points and operating on only the trailing set. Doing this precludes an unusual and difficult to diagnose failure mode peculiar to the way dual points operate.
Even if the dual points have not failed, you'd be well served by leaving the distributor configured as a single point unit.
Which set is the leading set? Well, on a fuelie dual point distributor of the era, the leading set is the set closest to where the coil(-) wire enters the distributor base. It's probable that the same set is the leading set in your distributor also.Comment
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Did you try replacing the coil? As mentioned earlier by MikeComment
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Dino, I had the exact problem. as it turned out it was the coil. once the car was hot it would break up. If you have a reproduction coil they are made in China and are no good.
BruceComment
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