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  1. Confident Noob

    Cylinders wont fire.

    Ok. Either I'm real dumb (strong possibility), or I'm real screwed. 0 compression/no movement on the guage on cylinder 1 or 3. I tried re-seating guage a little tighter... no change.
  2. Confident Noob

    Cylinders wont fire.

    Ooooooh. Thanks!
  3. Confident Noob

    Cylinders wont fire.

    I'm back! And about to start compression testing using the merc instructions. I noticed the instructions don't mention pulling power from fuel system, only grounding the coil. Should I be doing something to stop fuel flowing? With all plugs removed won't this test push a lot of fuel vapor into...
  4. Confident Noob

    Cylinders wont fire.

    I'm going to pick up a compression gauge next, and I'll post those numbers. Kinda concerned with the air flowing through a static engine, that i have stuck valves somehow. I'll also try to find those fuses again. I have the diagram. So far I found a fuse reset push button (little red button)...
  5. Confident Noob

    Cylinders wont fire.

    I do not think so. My fuel pump is electric, Mercury Quicksilver.
  6. Confident Noob

    Cylinders wont fire.

    To clarify for everyone, while engine is sitting, not cranking or anything, there is a steady pouring of cool air that comes out of the throttle body, or, from any cylinder with the plug unscrewed. It just seems to be flowing from the breeze... presumably flowing backwards from the exhaust...
  7. Confident Noob

    Cylinders wont fire.

    Lol. I'm really hoping someone will jump in with an aha moment about some component I'm not familiar with, but it truly makes no sense to have steady airflow.
  8. Confident Noob

    Cylinders wont fire.

    Added info: steady air flow coming out of all 8 cylinders when plugs are pulled. Fully functioning port engine dosen't do that.
  9. Confident Noob

    Cylinders wont fire.

    Not new. Engine wouldn't start after dewinterizing. I misdiagnosed starter and spark issues initially, and have moved on from that trying new things. Read several forums saying to spray starter fluid to essentially confirm if you have a fuel problem. If sputtering, then you know fuel supply...
  10. Confident Noob

    Cylinders wont fire.

    Follow up info: I'm getting a steady cool air flow coming backwards out of my throttle body... and same steady airflow coming out of plug hole with plug removed.... its a breezy day. But this doesn't seem like it should be possible. My brain is hurting.
  11. Confident Noob

    Cylinders wont fire.

    Hi all. Starting a new thread after getting some amazing help from this community and conducting proper testing to narrow down my problem. Long story short, my Mercruiser 7.4L MPI (L29) starboard engine won't fire up. I've worked past starter and ignition systems. Used a proper in-line spark...
  12. Confident Noob

    Starter wont engage flywheel.

    Ok, so I tested the plug e that should be supplying power to the coil. Red lead to the cable, black to a good ground on the block. No voltage before or during cranking. And the module is brand new.
  13. Confident Noob

    Starter wont engage flywheel.

    That one I'll have to check tomorrow when I have an extra set of hands. Calling it quits for the night. I'll be back with updates! Thanks all!
  14. Confident Noob

    Starter wont engage flywheel.

    Well, I tried swapping the module and trying again, same results. No firing on the motor. So it isn't the module, the coil, or the dizzy. No cracks or damage to the distributer cap. Inside contacts also look good. Batteries are brand new, voltage is good at the batteries, and at the positive...
  15. Confident Noob

    Starter wont engage flywheel.

    Dizzy passes all tests as well.
  16. Confident Noob

    Starter wont engage flywheel.

    So I tested spark with a cable and plug off the ignition coil high tension post (a) from the other image above, and had very faint spark. That should mean my issue is at or before the ignition coil right?
  17. Confident Noob

    Starter wont engage flywheel.

    Fantastic! You rock. Appears to pass all tests. 2- Infinite 3- .3 ohms 4- .3 ohms 5- 8070 If this is passing, what would I possibly check next?
  18. Confident Noob

    Starter wont engage flywheel.

    Thank you everyone for the help! I'm back on the boat, and working through the testing process for ignition system now. I swaped the the cable that went from the coil to the center cap with one of the plug wires, pulled a plug, and grouded it to test for spark from the coil. I got a little...
  19. Confident Noob

    Starter wont engage flywheel.

    Correct. Both motors are stamped LH. Rotation is good. Based upon weak spark after pulling a plug, it's looking like ignition issue.
  20. Confident Noob

    Starter wont engage flywheel.

    There's a bit of rust inside the distributor. Image attached.
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