Even though provision of a spark plug lead with a suppression coil therein eliminates interference resulting from secondary arcing or discharge across the spark plug electrode, it does not completely eliminate radio interference emissions altogether. Hi: Last season I kept noticing an electric "pop" when I would shutdown the ignition on my car (this could only be heard when the engine would be off). New dizzy cap and spark plugs have been put on. Date: Mon, 20 Jul 1998 13:58:32 -0500 : My local VW shop has finally diagnosed a really bizarre problem with my 95 GTI as a bad Coil Pack. Ignition Coil Arcing. The cause of "plug wires arcing over to ground" is always "insulation breaking down under load". Pull the cowling engine cover off, locate the ignition coil and try to start the engine. I’ve tried 3 different coils and all of them do the same things. Edited by sledgehammer, 06 November 2016 - 11:04 AM. Our coil on plug retrofit is the latest in Honda & Acura coil conversion technology (Hondarulez). As for the plugs, why not clean them as best you can, and swap them so the bad plugs are in the good cylinders, maybe just one at first, then both. Get rid of those shielded cables. When they are like that, they are effectively shorted out and won't spark. They do nothing as far as preventing air box explosions and are more trouble than they're worth. using MSD 44 NGK R6061-10 Plugs. plug number 5 is arcing at coil. When replacing the spark plugs or ignition coils, it is also a good idea to replace the boots. are the plugs getting wet & is there compression on the affected cylinders ? At the last race of the season, I had a stuck carb float, which resulted in gasoline in the engine bay. wonder if excess fuel in cyl is fowling the plugs ? A spark plug wire is a basic but critical engine component. Opened the hood with the engine running and, I saw the Coil pack on #1 is arcing to the Cylinder head. 2/3 are still fouled though, not as bad. If an engine is experiencing repeated coil failures, the underlying cause may be resistance from worn spark plugs or excessive spark plug gap. After reconnecting the wire to SP, engine doesn't die anymore, but still arcs sometime and on every WOT(wide open throttle) it … May not be the coil that's bad , it might just need new wire(s) and it could also be your spark plugs are ready to be replaced too (higher resistance will cause arcing). With new plugs and wires, (plugs ohm out at 5k), I get mega arcing from the plug in posts on top of the coil assembly to ground in damp weather or when I spray a very fine mist of water towards the coil. At an idle i didnt notice anything. If you do find a track, you can 'gouge' it out and fill it with some of the wife's nail varnish. The capacitor is then discharged into a coil mounted on top of the sparkplug of the single-cylinder engine, which fires the spark. Look at the coil and check for arcing. This system has been working fine with the engine. HT is the plugs leads, not entirely sure under what conditions you mean it sparks. How to Test Spark Plug Wires. Held the throttle open a little and bam the coil wire started arcing against something. You currently have javascript disabled. When arcing like this occurs it is most likely due to a bad ground connection between the coil and the plugs. My 2002 3.5L ES was idling rough this morning and, CEL started flashing, then went solid. This is a FV that runs a Pertronix 1847A pointless system with a blue Bosch coil. If the plug doesn’t fire, usually around 26,000 volts, then the voltage will go higher until it can find a path. I have checked for 12v at coil while running, I have checked and double checked my motor and chassis grounds, I now have my new MSD wires in the box and the old crappy wires on and it runs awesome. If the engine starts, running for a while should either foul up the bad plugs, if they are the cause of the problem, or burn the crud off them and foul up what were the good ones if it is an engine (carburettor, manifold, valves, pistons etc) fault. Edited by Hammer42, 06 November 2016 - 12:22 PM. Pull the coil pack wire out of its pin connector by depressing the tabs and lifting up. However why not try to clean and dry the coil thoroughly around the HT terminal and its extended insulator, put the lead back in and spray it with a good coating of Damp Start or whatever they call it now, the stuff that leaves a clear insulating film. There is enough voltage there to give you a painful jolt. It looks like I have the pink and white wire although faded so I'm assuming thats ballasted also says resistive or something of that nature.