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  1. J

    Ignition sensor ohms test

    Maybe being an ‘88 mine looks much older, but when I get down to the lake I’ll take another look and upload a pic of it.
  2. J

    Ignition sensor ohms test

    I have no reason to pull off the TB system, and have kept the original distributor in a box in case I need it again. I consider the TB, original dist/cap/rotor not any part of the reason it was running poorly. There is however a coil (transformer?) looking thing on the port side just under the...
  3. J

    Ignition sensor ohms test

    As an update to all who’ve chimed in to help with their advice - thank you. I did order an all-in-one dist/ign mod/coil unit, dropped it in and engine fired right up straight away…..but still ran the exact same. So I abandoned troubleshooting it, brought it down to the marina and got her into...
  4. J

    Ignition sensor ohms test

    I’ve never changed it, and had the boat for about 8 years. I did remove it and clean the terminals and rotor+rotor terminal until they looked new. Fired right up. But i think you’re right, for the price I should replace the cap and rotor anyhow. Thanks for taking the time and responding.
  5. J

    Ignition sensor ohms test

    Thanks. I’ll go thru those items shortly, especially the tach - I remember last year the tachometer was acting “odd” and reading 3000 rpm when we were cruising smoothly at about 1800, but never caused engine to misfire. I just tapped the gauge and it came back down. Also, years ago when I...
  6. J

    Ignition sensor ohms test

    This is the info I need to learn. Thank you. I think a new OEM sensor and module will be cheaper than a decent scope.
  7. J

    Ignition sensor ohms test

    Yessir, learning that right now 🤦‍♂️
  8. J

    Ignition sensor ohms test

    Hey there. Thanks so much for taking the time. Long story short, took boat out of winter storage, connected to garden hose, fired right up. Idled smooth as silk and let it run until temp came up to normal. Oil psi normal. Revs to 3000 smoothly, back down to idle smoothly. Smoooooth as silk...
  9. J

    Ignition sensor ohms test

    Yep. I can list all those addresses here. Seen most of them. AI says between 700 and 1200 ohms but I have 2 sensors here and neither achieve that reading. I’m thinking of just ordering a complete Thunderbolt IV replacement module and sensor. At my wits end.
  10. J

    Ignition sensor ohms test

    You sir, are smart. My engineer at work and I just talked about the same thing this aft. Will be trying it shortly.
  11. J

    Ignition sensor ohms test

  12. J

    Ignition sensor ohms test

    Has anyone tested an ignition sensor a Thunderbolt IV? What is the ohms reading for a good working sensor? My specific boat is a 1988 Mercruiser 5.7 Thunderbolt IV. My original sensor reads very high, and my ordered-from-Amazon sensor also reads very high. Maybe it’s doa, or my meter is not...
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