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  1. Scott06

    Mercury 3.0 EST no spark

    if it is not moving around at idle it is locked in base mode. Module only in there. I would try as AD suggests pulling the plug off. Only thing I can think of is if you are getting 12 v to the base mode wire ... Assume balancer hasn't slipped such that you are not actually at TDC ... grabbing...
  2. Scott06

    Identifying 1976 Engine-is it a 302 or a 351?

    yes the deck is taller on a 351 hence the wider intake bolt spacing Take a picture of the carb, thinking it is an old Carter AFB given the sticker and the fuel inlet location. I would verify it is a marine carb not an auto one... Not sure if the Old carter AFBs (that sticker predates carter...
  3. Scott06

    Runs great on muffs but not in lake

    Take the drive off and see if the shutter ,which should be at the the top of the exhaust pipe just below the down elbow, is blocking flow. If it isnt stuck in there or in drive (it went somewhere) you dont have an issue with exhaust restriction.
  4. Scott06

    Mercury 3.0 EST no spark

    Were the modules from the same supplier? So you are able to get it in base mode and set initial timing, but the timing doesnt advance past 18 deg BTDC? I think you should be 24-26 or so total at 2800 or so rpm. Do you remove the jumper to put it in base mode? seems to be locked in base mode
  5. Scott06

    Alpha one gen II growling noise when turning

    I think he meant the input shaft bearing in drive, but could be bearings on vertical driveshaft. Would think the input yoke and bearing would have some side play if worn and be the only part to make noise when turning drive. I think you only need the tool to remove large ring nut off drive input...
  6. Scott06

    Merc 5.7 Keeps Shearing starter bolts

    Would suspect your bolts are loosening up or not correct, maybe you have a hydro lock going on? Would use a mirror to see if threads are busted, try loctiting them in. My friends boat had a loose starter couple years back, dealer had replaced starter under warranty just after he bought it. Bolts...
  7. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    By the serial number its a mercarb 2 bbl. Was hoping hed post a pic since it had been replaced
  8. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    Scott has you steered straight. Buy or rent a fuel pressure tester plug it into the test fitting scott mentions. Alternatively you can disconnect the fuel line from carb and cobble together flare fittings with hose and a T to put it in line between pump and carb. Need 4-6 psi. you pretty much...
  9. Scott06

    Mercruiser 5.7 carbureted wont start when warm

    How about an engine serial number or picture of carb so we know what you are working on ? Fuel dripping of Venturi when you shut off is stuck needle and seat /float or too high fuel pressure. Can measure fuel pressure then put a carb kit in the carb. What carb did he use ? When this happens...
  10. Scott06

    Almost back together, but a shifter issue

    Good thing is you only gotta learn it once, guarantee you won’t forget it …
  11. Scott06

    4.3 Engine coupler issue?

    Is it possible one of the rubber insulators that goes between the coupler and flywheel got knocked off during assembly ? Might be worth popping off flywheel cover before buying a new one
  12. Scott06

    Yamaha Sterndrive Engine Coupler

    You may change your mind about the swap after u look at current boat prices… Only source is used best bet type in part number on google search There is a complete Yamaha drive incl coupler on eBay now but is expensive
  13. Scott06

    Bad knock and then not...Hydrolock?

    Pull plugs out and crank it over hydro lock would push water out of plug holes
  14. Scott06

    New to boats and about to burn down my boat. Need some help with wiring.

    Wiring diagram attached
  15. Scott06

    New 5.7 overheating

    You are also likely getting some water into the cylinders this way
  16. Scott06

    New to boats and about to burn down my boat. Need some help with wiring.

    The thunderbolt modules are made by denso. Here is the TB troubleshooting guide https://forums.iboats.com/threads/how-mercruiser-thunderbolt-ignition-systems-work.676476/ did u test the sensor inside distributor by tapping the wire to ground as seen in the guide? some of the newer engine...
  17. Scott06

    Runs great on muffs but not in lake

    When it won’t start back up do you have spark ? If not would check shift interrupt or disconnect it to test( won’t come out of gear though) If you have spark dump a little gas down the carb if it fires for a bit then it’s fuel related Just need to determine if you have spark issue or gas issue
  18. Scott06

    1991 Mercuiser 4.3 ignition system update

    Install instructions http://marineengines4less.com/images/companies/1/EST%20Ignition%20Instructions%20-%20ME4L.pdf?1431462059320
  19. Scott06

    Mercury 3.0 EST no spark

    Yes especially if aftermarket seems to be common issue going in and out of base mode You won’t make power with out any advance
  20. Scott06

    Sporadic power/throttle performancePCV oil leak

    This is good advice see whats in the filter, probably carb related. Would verify timing is ok as well
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