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On Saturday morning I fired up the car and it sounded horrible. It was definitely running on less than 8 cylinders. Sunday morning I drove it across the street to a friends garage and we started the process of trying to figure out what was going on. We identified 3 cylinders that were not firing. We moved plugs from working cylinders to the non-working and still didn't get a spark. We switched plug wires from working to non-working and still didn't get a spark. We changed distributor caps and rotors and that didn't resolve the problem either. The PO installed a Pertonix Ignitor II and Flame Thrower II coil in 2012. After ruling out plugs and wires, the ignition seems like the only variable in the equation but it doesn't seem logical that it would fire on 5 cylinders but not the other 3.
Base 350.
Compression in all cylinders is good.
Has anyone ever seen these ignition kits go bad and can they go bad like this?
Are there other systems out there that I should look at if replacing the Pertonix is the way to go?
On Saturday morning I fired up the car and it sounded horrible. It was definitely running on less than 8 cylinders. Sunday morning I drove it across the street to a friends garage and we started the process of trying to figure out what was going on. We identified 3 cylinders that were not firing. We moved plugs from working cylinders to the non-working and still didn't get a spark. We switched plug wires from working to non-working and still didn't get a spark. We changed distributor caps and rotors and that didn't resolve the problem either. The PO installed a Pertonix Ignitor II and Flame Thrower II coil in 2012. After ruling out plugs and wires, the ignition seems like the only variable in the equation but it doesn't seem logical that it would fire on 5 cylinders but not the other 3.
Base 350.
Compression in all cylinders is good.
Has anyone ever seen these ignition kits go bad and can they go bad like this?
Are there other systems out there that I should look at if replacing the Pertonix is the way to go?
I suspect the Pertronix magnet is damaged.......remove the distributor, clamp in a soft vice and measure the module to see if the magnet opens and closes in all 8 positions......
Thanks @Jebbysan
My friend wasn't working this morning, so he was out in the garage and started taking a look at the Pertronix unit. There is a clear plastic piece that holds in the magnets. It wasn't doing a very good job. Some of the magnets were falling out and the polarity on one of them was backwards. He epoxied the magnets into the holder and everything is good. Apparently, not the best design.
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3 Cylinders not firing
