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  1. Y

    Mercury 3.0 EST no spark

    Awesome, thanks!! Still wondering if it's carb, not making much sense. I'll start it up , idles great, runs great, revs freely, goes back to idle (not good idle afterwards) and then it won't take throttle anymore, just bogs and dies, sputters a lot with backfiring. Start again, and seems to run...
  2. Y

    Mercury 3.0 EST no spark

    Trying to do some more digging on this carb. In seeing S/N 15396A4, but I can't seem to find anything on this carb. My engine serial is 0F076166, but it's not listing this carb being on it. Am I reading carb wrong? Pic attached.
  3. Y

    Mercury 3.0 EST no spark

    About 170 each cylinder. Sure seeing a lot of white smoke from exhaust, maybe their is water in it.
  4. Y

    Mercury 3.0 EST no spark

    Ended up going to O'Reilly's and found any GM Ignition Module. Found one for $37, and it runs again! It ran really bad when I got it, so I cleaned the carb which was filthy, sonic cleaned, blew out the jets. Still ran the same. Tried it again to make sure, still terrible. Accelerator pump has a...
  5. Y

    Mercury 3.0 EST no spark

    Playing around with it more, all the sudden I have 12v on the C/+ wire. Still no spark. Next step in the service manual is to check the Tach for voltage, which I am getting. I don't have a test light, but while cranking, voltage to tach drops from 12'ish volts to 8-9v. According to service...
  6. Y

    Mercury 3.0 EST no spark

    I ordered cheap aftermarket coil and ignition module, so we will see which one fixes it. Whatever was bad, going to order new OEM.
  7. Y

    Mercury 3.0 EST no spark

    I checked it like you said, 12v going to coil on purple wire but nothing coming back out on 2 wire cable going to dizzy
  8. Y

    Mercury 3.0 EST no spark

    Does anyone have a good source for the module?
  9. Y

    Mercury 3.0 EST no spark

    Thank you, I tried the pickup coil test in your last post and it seems to be fine. Tried to measure the + side of C again and get .5v. Really wish I had another module to test!
  10. Y

    Mercury 3.0 EST no spark

    Ok thanks for the info. Wonder what happened In a day to make it go out and not getting spark. Also, when you say not passing voltage, is it getting 12v from 4 pin on distributor?
  11. Y

    Mercury 3.0 EST no spark

    None of them seem to be tripped. This has the two C / + wires I am talking about.
  12. Y

    Mercury 3.0 EST no spark

    I tried putting battery voltage to purple wire going to coil, but still no spark from coil. Still not really sure why C / + connector isn't getting any voltage at all
  13. Y

    Mercury 3.0 EST no spark

    Hello everyone, Trying to fix my friends old 1994 Bayliner Capri 1950 with Merc 3.0. It was running yesterday, did a compression test and now it won't run. First thing I did was checked for spark, and not getting anything, even from coil. Right now I am running through the service manual "EST...
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