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  1. C

    4.3 MPI Performance issue

    The 5599 and the ITR4A-15 are the same (not sure why they have 2 different numbers). It is an iridium plug and comes pre-gapped at .060.
  2. C

    4.3 MPI Performance issue

    Runs at 160 degrees, just put a new tsat in this summer because the old one was stuck open and it did run like crap. I put the ITR4A-15 NGK plugs in it this spring, gapped at .060 along with a new cap and rotor. I noticed today that when I first fired it up it sounded like I could hear spark...
  3. C

    4.3 MPI Performance issue

    So when I did a compression check on a cold engine my readings were about 160, the 185 was with a warm engine and the throttle wide open. It may not be the most accurate gauge, but all readings were within a few psi of each other. Battery voltage at the battery was 12.5v (brand new battery)...
  4. C

    4.3 MPI Performance issue

    Hello, first time poster here, long time follower. I have a 2005 Crownline 180 with a 4.3 MPI in it. Engine serial # is 0W333843. When I start the engine it does not fire off like I am used to with a Fuel injected engine, it just kind of slowly sputters until it gets to idle rpm. Once idling it...
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