Mike174 Posted January 22, 2016 Share Posted January 22, 2016 Hi I've got a 3.9 which I've added megajolt to and was running fine then just cut out. It was still using the original coil to get the 14cux fueling. I've read about adding in resistors to replace the coil and still send the signal. I'm struggling to find/understand exactly where I wire them in to and what values I need? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 22, 2016 Share Posted January 22, 2016 You take them from ABCD at the coil pack or the EDIS, whichever easier. if you search for diodes rather than resistors you should get more results, you use 4 1N4001 diodes and a 5V zener, though I forget which part number off the top of my head. Quote Link to comment Share on other sites More sharing options...
Mike174 Posted January 22, 2016 Author Share Posted January 22, 2016 Speaking to a friend who has done it he suggested 4007 diodes and a 12v zener? All this is over my head so no idea what the difference in the diodes is... Thanks for the advice Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2016 Share Posted January 22, 2016 The diodes stop current flowing backwards (think of them as a one-way valve for electricity) so the coils don't interfere with each other. The zener acts as a limiter, it will try to stop the voltage across it going above 12v although the input to the 14CUX is likely quite tolerant of spikes from the original coil. Quote Link to comment Share on other sites More sharing options...
Mike174 Posted January 22, 2016 Author Share Posted January 22, 2016 Thanks for the reply, so it doesn't matter if I use 4001 or 4007 diodes? What about the original resistor in the loom? Seen some say remove it some say leave it. Quote Link to comment Share on other sites More sharing options...
dave88sw Posted February 10, 2016 Share Posted February 10, 2016 I have done exactly this and if you follow the above diagram (i opted for the resistor rather than a zener) you definitely remove the resistor that's in the original wire. The resistor on mine was in the loom right next to the coil, however, i ran the wire back into the cab and joined into the ecu loom much closer to the ecu itself. Quote Link to comment Share on other sites More sharing options...
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