ozconnection Posted September 29, 2019 Share Posted September 29, 2019 Hi, A general question. As the title suggests, what spark plugs do/can I use when running the Ford DG508 ignition coils? I had read elsewhere that a guy had converted his car to COP ignition but had encountered problems with a random backfire/misfire. A friend of his who was running a similar setup said he had encountered the same problem and had fixed it by selecting resistor type spark plugs. Now both gentlemen have engines that run without the backfire/misfire problem. Before I get my new motor up and running, I was wondering if the Ford coils are spark plug specific? If so, what plugs do you run with them? Thanks for your input. Quote Link to comment Share on other sites More sharing options...
jonbill Posted September 29, 2019 Share Posted September 29, 2019 Resistor plugs give less electrical interference than non resistor plugs, so perhaps some EMS could be sensitive to interference from non resistor plugs. I wouldnt think coil packs would be affected though. I don't think there's a down side to using resistor plugs. Quote Link to comment Share on other sites More sharing options...
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