1995 Nautique w/ Throttle Body????

I have the same engine, and could not be more pleased. The "Pro Ski" is a 351W with either 285 or 308 HP (I have not definately resolved actual rating). The engine definately utilizes TBI fuel injection (I know, a bit redundant) as manufactured by Holley with a custom PCM computer. The unit flows 950 CFM of air (4V version) and thus flow more air than the GT-40 of the same era. Consequently, PCM and CC claim that the TBI engine will out perform the GT-40.

The downside, is that the TBI engine is somewhat of a gas hog due to the large throttle plates.

Yes, I imagine the '94 and '95 TBI engine are virtually identical. Incidently, why have you sworn off the TBI engines...or should I ask why was it troublesome?

Yes, there was a service bulletin where they replaced the entire throttle body (can't remember why). Anyway, the new throttle bodies have a red throttle arm to indicate it has been replaced. The system is rather very simple mechanically, not much adjustments to be made other than fuel pressure and throttle position sensor base setting.

When I first got my boat, it ran horribly and I went through everything trying to fix the problem that turned out to be a grounding problem due to a loose bolt. While I was troubleshooting, I called PCM and discovered that all the parts are still available (for both TBI and the required Pro-Tec ignition), including the control module. I sort of got the feeling that PCM is hording the remaining stock to be sold to only owner's that have the TBI engines (i.e. the Pro-Tec ignition). The main problem is that the TBI computer is about $850.00.

Once I fixed the grounding problem, the engine runs flawlessly all the time. The TBI runs notoriously rich, but I improved upon this by reducing the fuel pressure to 13 psi by advice of Mark at PCM (spec is 15psi).

When it is all said and done, I would rather have a GT-40. However, I would rather have the TBI over a carbureted engine mainly due to the cold start issues and fouling issue due to lay-up of carbureted engines.

David F that is "great" information. If the deal on the boat works out, I will definitely reduce the fuel pressure. Now that I have read your comments it is sort of coming back to me. Fouling and richness were the issues. I will know if I get the boat in a week or so and let give you an update. It needs all new skins but only has 340hours. Also nees a few TLC things.