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  1. S

    No power with a 4.3LX

    I have an update. Replacing the coil did not improve the idle. Found a TB IV that was NOS and replaced the sensor. The timing was off by 2 degrees at 6°, so I corrected that and now runs like a champ and was able to do 50+, better than last year.
  2. S

    No power with a 4.3LX

    Ok, will see what I get when I check the timing.
  3. S

    No power with a 4.3LX

    I have the Thunderbolt IV and with the absence of any other signal rpms is all that is left which is what I concluded, but I was still looking for a wire to ground to set base timing as I would do on my cars. So, this is new to me, thanks for the info. Do you know what the rpm at idle should be...
  4. S

    No power with a 4.3LX

    I have not checked or set the timing yet. It worked great last fall when I bought it. It does have a thunderbolt ignition system and I saw the sensor in the distributor but I thought that is just to pulse the ignition to fire. I thought there would be some other signal to the ICM to advance the...
  5. S

    No power with a 4.3LX

    First time boat owner, I have a 1993 4.3LX, ran great, did a simple tune up by replacing spark plugs/wires and cap/rotor. Removed coil because I was unable to remove coil-to-distributor wire, cleaned high voltage contact, all looked better. Starting is a little hard. With the drive not engaged...
  6. S

    Octane requirment for a 1993 4.3LX

    I knew there was a problem, just didn't know how bad it was. Thanks for the info!
  7. S

    Octane requirment for a 1993 4.3LX

    Is hydroscopic tendencies only an issue when fuel sits for a period of time?
  8. S

    Octane requirment for a 1993 4.3LX

    Hi, I'm new to boating. I have a 1993 Dolphin Gemini 199 CC which has a 4.3LX. No manual was provided so I question what the required octane level is. Does anyone know what the manufacturer recommends? Thanks, Nick
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