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  • 351 pcm

    My 1991 Ski Nautique has, after years of trouble-free operation, (500+ hrs) has developed a misfire at all speeds except idle. Sometimes the engine will quit, but will restart immediately. Research has led me to suspect the coil packs. Any way to test them? Should I consider retrofitting a new distributor system? Cost?

  • #2
    Iím not sure of a way to test them but go to www.correctcraftfan.com those guys know a ton about the older nautiques. I have a 92 sport nautique and theyíve helped me a lot over the years.

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    • #3
      Thanks. I'll give them a try. I guess I've got all winter to figure it out.....

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      • #4
        Anybody have good results switching coil packs for a standard distributor?

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        • #5
          Like Chris says get over to CCF for the older boats. Here is the best thread out of many on the change over. There are different ways of doing it- D.U.I's are one of the best choices. I believe there is someone who figured how to change the pro tec and keep the throttle body injection version as well.
          Last edited by gary s; 1 week ago.

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          • #6
            I would replace cap and rotor and make sure the points are adjusted correctly. I had the same motor in a '91 Ski Brendella and had the same issues you are having, and that's what mine ended up being.

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            • #7
              That's normally a good idea but one of the concepts of the ProTec is no cap,points or rotor. A seemingly good first effort on engine management,the down side being no service parts or support.

              Click image for larger version  Name:	Protec_3.jpg Views:	1 Size:	46.0 KB ID:	572833

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              • #8
                Get rid of the pro tech, itís crap! Mine was converted a long time ago and it runs great. It runs nearly as good as a new efi engine.

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                • #9
                  Thanks all. I've decided to junk the pro-tech and retrofit a DUI system. Now the shopping begins!

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                  • #10
                    Go to skidim.com and they sell a kit to get rid of the pro tech.

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                    • #11
                      While your Protec may have crapped the bed, when was the last time you did plugs/wires? I'd at least start there before dropping the money on a conversion, since you can easily re-use the plugs/wires if you swap to a dizzy (unless any of the coil packs look melted/deformed - in that case just convert it). If you do convert, you won't notice any difference in power, and may even notice an improvement since you're dealing with a carb. When mine craps out, I'm going to have to do the distributor and replace the TBI unit with a carb, which doubles the cost...

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                      • #12
                        No need to replace the TBI unless you want to......

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                        • #13
                          The boat currently has a 4 bbl. Holley carb. Do I need to do any adjustments or modifications to it?

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                          • #14
                            Originally posted by LCIB View Post
                            The boat currently has a 4 bbl. Holley carb. Do I need to do any adjustments or modifications to it?
                            Shouldn't have to do anything to your carb (so long as it's not in need of a general tune-up or rebuild).

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                            • #15
                              Originally posted by gary s View Post
                              No need to replace the TBI unless you want to......
                              Ooh, I hadn't caught that thread on CCF, that's good news and will likely save me $500ish bucks down the road. For now, my Protec w/TBI is running pretty strong, but frankly I'll be surprised if it makes it to 1000 hours knowing when most seem to crap out.

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