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  1. U

    Ignition sesnor or ignition module?

    hey guys back to pick your brains lol. question is how do I tell if the ignition module or ignition sesnor is bad? boat is doing its stupid thing again where after about 20 mins when everything is warmed up the boat is hesitating back firing loosing power and running like crap hard starting...
  2. U

    Timing a mercruiser 1984 4.3 lx

    I read online that the thunderbolt IV ignition has a mbt (mean best timing circuit) and that purple wire i was asking what it was is called wire 13 which needs to be grounded out to disable the mean best timing circuit to get a baseline timing of 8 deg btdc. does this sound correct to you...
  3. U

    mercruiser 4.3 lx not starting

    Just started having an issue my mercruiser 4.3 won't start. it seems to want to run backwards a couple strokes. Timing is good new plug wires dist cap is clean getting good white spark. cant figure it out. here is a video of what its doing
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