jays55 Posted August 31, 2019 Share Posted August 31, 2019 Posting this for anyone who has done a Pertronix distibutor conversion to replace their original point/condenser...... On a recent start up. my '70 454SS had a distinct miss. I removed the spark plugs and the #4 plug was wet. I checked the #4 plug wire and was getting no fire at the plug. I removed the #4 wire at the distributor and there was no spark from the distributor. I replaced the distributor cap and rotor. Still no spark at #4 cylinder. Not knowing were to go next (and after posting on the forum), I contacted Pertronix to see if they had any idea what could cause this miss at a single cylinder. The tech immediately suspected the Pertronix magnetic ring of having damage, or a thrown magnet. Without hesitation, he offered to send me a replacement magnetic ring. When I received the replacement magnetic ring, I removed the distributor and, sure enough, the insulating material below the #4 magnet was torn. I replaced the ring and the car runs like new! For anyone else who has done this upgrade and is experiencing a non-firing cylinder before the distributor cap, here is the likely problem. This would be difficult to diagnose without this info. Below is a pic of the old magnetic ring (left) and the replacement (right). Also a link to the youtube video on converting the distributor..... Installing PerTronix 1181 Ignitor or 91181 Ignitor II into standard Delco Remy Distributor - YouTube Quote Link to comment Share on other sites More sharing options...
tom71 Posted August 31, 2019 Share Posted August 31, 2019 Super troubleshooting. Petronix has a good product and it is obvious their personnel are very helpful. Thanks for posting. Tom Quote Link to comment Share on other sites More sharing options...
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