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  1. K

    Mercruiser 4.3LH backfiring & weird timing

    What’s my next move? Engine: 2000 Mercruiser 4.3LH 500+ hours thunderbolt 5 ignition. Weber 4 bbl carb. Issue: mid summer the engine started bogging at higher rpms and while accelerating under load and would backfire through carb if accelerating too fast. Worse while engine was cool, but...
  2. K

    Lack of voltage to fuel pump, intermittent, mercruiser 4.3 LH

    1998 Mercruiser model MCM 4.3 LH S/N 0L690518 I'm having an intermittent stalling issue that is the result of a lack of voltage to the fuel pump through the oil pressure safety switch circuit. I've been working on this issue for a while, and being intermittent, it has been difficult to...
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