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3 or 8 degrees BTDC 1988 5.7 Cobra 2 timing settings listed in manual-gctid812366

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    3 or 8 degrees BTDC 1988 5.7 Cobra 2 timing settings listed in manual-gctid812366

    Getting ready to launch soon. Tried getting her started and lots of problems. Had to replace one of the main fuses. Once we did this trying to start her up was not good. Lots of banging. I decided after all of this work I am going to time it from scratch. Took out #1 plug. Cranked it until it popped. Now I'm at TDC. AND....... my rotor is 180 degrees out in wrong direction. Removed the distributor, reseated with the rotor facing #1 plug. Removed all of the wires on the cap and turned it 180 as well to line up with #1 plug and #1 wire. There s a flat spot on one side of the cap so I had to rotate the distributor body to line up the cap to get the plug wire to match #1 facing #1 cylinder. Voila! She starts right up and purrs like a kitten! Now here is my question. I have a 1988 5.7 Cobra. And I have the original manual. It has 2 timing settings listed - 3 degrees BTDC and another one listed for 8 degrees BTDC. Both 1988 5.7 cobra. I think the difference is based on the type of gasoline octane? Not sure. I use pump gas from the automobile gas station which I cart to the dock. I do not use marine fuel. If I am using 87 octane do I set it at 3 degrees or 8 degrees? Also if you see my original thread just maybe I had the distributor and cap 180 degrees out and this is why I could not get above 2500 RPM's? Will see in a few weeks once I get her in the water. Thanks for all of the advice!

    #2
    Esa module went maybe.

    Next time when you can't go above 2500 rpm, pull the 2 leads that go to the module.

    see if that fixes your problem
    Be good, be happy, for tomorrow is promised to no man !

    1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

    '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

    Manalapan N.J

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      #3
      Don't think I've ever heard of a 3* BTDC on a V8. Most all mercruiser stuff is set to 8* BTDC. Looking at your other thread regarding your issues: you've changed out the points for an electronic pickup but have you checked the distributor for shaft wobble and/or proper advance weight operation?
      Dave
      Edmonds, WA
      "THE FIX"
      '93 2556
      Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

      The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
      Misc. projects thread
      https://www.baylinerownersclub.org/f...56-gctid789773

      Comment


        #4
        Also regarding your other thread : mark the location on your throttle controle at the point the carburetor secondaries begin to open as to verify if this is where she's starting to fall flat.
        Dave
        Edmonds, WA
        "THE FIX"
        '93 2556
        Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

        The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
        Misc. projects thread
        https://www.baylinerownersclub.org/f...56-gctid789773

        Comment


          #5
          if using regular gas 3*BTDC, if using premium gas 5*BTDC
          Joon, Kathy, Jaden & Tristan
          Uniflite 42 AC, DD 671N
          93 3058 sold
          92 2855 (day boat)
          91 Fourwinns 205 (lake boat)
          Longbranch WA
          Life is Good

          Comment


            #6
            Understood - Question.... - what is the TA number and at what RPM for this engine? Do I need to get an advanced Timing light or am I better off trying to scribe the flywheel? Never did this before and never used one of these advanced lights. Thanks

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