Hilly Posted January 10 Report Share Posted January 10 Hey legends. Have installed some PRP supplied coil packs via an expansion loom on a previously-running VL Turbo with G4+ plugin. Changed the Ignition mode to Direct Spark. Have left the Dwell table alone for the moment given I'm already having voltage issues. Dwell lower than recommended values but I'd still expect the car to start. Battery (relocated to boot) is in excellent condition with full charge (even tried connecting another running car battery via jumper leads). Coil packs working great - testing individual coils works perfectly. While cranking I observe (via Runtime values or by watching the Dwell table) the battery voltage dance around quite a lot. Occasionally dropping well below 10v which proves insufficient for the ECU and the green light turns off (and the laptop disconnects). Car backfires every now and then, but never starts. Always seems to drop too much voltage and stop cranking before starting. I'm anticipating an electrical issue here (as has plagued the car since I bought it - 35+ year old wiring is not my favourite), however, I thought I'd ask here first incase there is potentially some ECU controllable influences that might be at play - and that I can easily test with a few clicks, much easier than anything involving my multi-meter. Incase it's of value, I have attached the tune. Really appreciate any help. Thanks vl-coils-voltage-issue.pclr Quote Link to comment Share on other sites More sharing options...
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