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A friend of mine bought a PCM# RK107025A conversion kit from Nautique Parts. He asked if I could install it for him . It seemed pretty straight forward so I said yes . I thought the kit was made for this conversion but it is more like a bunch of cobbled up parts that are close but not quite a perfect fit to his engine. The directions are a joke hand written and very generic. He also supplied me with a copy of a wiring diagram for this kit off the forum . Using both and the knowledge I have from 40 years of working on 351 PCM engines I got it done . The boat runs great but I have a couple quirks . First the volt gauge reads low around 12 volts but 14.2 at the battery. Second the tach reads low about 4-500 RPMS it increases with the throttle but is off. The owner thought he has a ground issue in the dash that causes the volts to read low but the tach was reading fine before the conversion . Has anyone installed this kit and had similar issues? Any ideas where to start the gray wire is securely attached to the - side of the coil ,
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I bought the RH version of that kit. At one point it was the cheapest way to get a RH Mallory distributor. I never had to do a full install but I have seen the kit firsthand. It is a cobbled together kit with little instruction. As far as voltage I think you’re going to have to trace back to see where the issue is. I’d be especially suspicious of parasitic drain through a ground. Not sure what year or model you’re working with but I’m pretty sure all dash setups for the protec years are a daisy chained mess.
As far as RPM, are you sure it’s wrong? You changed the method of spark distribution and some of the timing characteristics. That can affect the RPMs. -
After thinking about it I wonder if the tach is set to 4 cyl instead of 8 . The ProTech DI system fires both the compression and exhaust of two cylinder mates . That is why there are 4 coils on a V8 system. I will check this weekend . Has anyone else installed this kit and had this trouble? I am working on a 93 Sport 351 w.Comment
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