Quote:
Originally Posted by Showdown
Denso smart coils.
Bench tested a bunch of them for resistance and they were shot. I didn’t test all of them because at that point who cares.
Dwell was 3ms, cranking dwell 6ms.
My guess is that they were either crap coils or the heat caused them to fail. Dunno. Theories welcome
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What was the "shot" resistance? Typically with a later COP system (5-12V input signals), you can't really measure the primary coil resistance.
So your coils are most likely conventional coils requiring an ECU output coil driver capable of 5-8 amps for the 3ms or longer dwell time.
If ECU provides a too short of a dwell time, an inadequate spark will result. Hopefully the coil supplier provided the proper coil for your ECU setup.
But when you note, "Denso Smart coils", this implies the ECU is providing a low level switching voltage (5-12V).
So what type of COP system do you have? For proper troubleshooting, you need to use a scope to check the coils' primary signals.
Post 545: "Well it turns out that I had three VW/Audi coils"
So with just three coils, it's a wasted-spark system, conventional coils (primary ~ 2-3 ohms)?