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  1. 1

    Engine will not go over 2000RPM

    I have a 4.3L throttle body injected Mercruiser (s/n M093527), we just installed a brand new long block. Ever since installation the boat runs good at idle and on muffs but under load it will not go over 2000rpm. We used some existing parts off the old engine like intake, distributor, coil...
  2. 1

    Need Help Timing 4.3L TBI

    And my fuel line that was kinked from my filter going to my pump.
  3. 1

    Need Help Timing 4.3L TBI

    Hey i just installed a brand new GM longblock. We have timing close enough to where boat runs and idles fine but need to set base timing now with timing light. Im having difficulty finding what wires i need to jump in order to do this. Its a 2003 Mercruiser TBI with a thunderbolt iv.
  4. 1

    4.3L Merc Exhaust Conversion!?

    So I have had some horrible luck over the past year with my boat engine.......we finally put a new rebuilt long block back into my boat and upon bolting my old exhaust on (single piece still) i noticed on one of the driver side manifold that it had 2 holes that were nice and black and one front...
  5. 1

    4.3L Merc Compression problems

    Gasket on No. 5 cylinder
  6. 1

    4.3L Merc Compression problems

    Hey posted on here previously regarding my 4.3L. Im still battling to figure out what is wrong. This problem happened almost instantly on the water when the boat went from running great, to barely running at all. And all happened when i may or may not of free wheeled out of the water. I hit a...
  7. 1

    4.3l tbi need help!!!

    Hey posted on here previously. I had issues with my 4.3L TBI Merc. This problem seems to start just instantly one day after a really quick shut down in the water. I was having problems with the boat starting and idling, it was running extremely rich and smoking when it did start, i was having...
  8. 1

    4.3L TBI Merc Fuel regulator replacement

    Posted on here a few times already but finally came to diagnose my 4.3l tbi merc's fuel regulator is stuck fully open. The boat is at my fathers house and he is trying to persuade me to run another fuel regulator in the fuel line instead of replacing the broken factory one. He is suggesting we...
  9. 1

    Fuel Regulator Stuck Open

    Hey posted on here previously i was having trouble with my 4.3L TBI merc......I had a mechanic look at it and he determined my fuel regulator is stuck wide open. The current fuel regulator is not EASY to get too, so i was wondering if i would be able to purchase and use an external aftermarket...
  10. 1

    4.3L Starting/idling issues

    K im fairly new to boating just bought my first one this year from a close family friend. Its a 2003 VIP with a 4.3L Mercruiser EFI. Im pretty mechanical, worked on many things throughout my life but total rookie marine mechanic now. Anyway I purchased the boat in winter, as far i knew it was...
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