GT40

Lewy I posted the garage info a few posts up. Things that make thr condition happen. Leaving the boat in overnight, running for 5-10 minutes come back down boat is not gunna fire unless wot. If im sitting with friends for a few hours wot ok first start. The odd thing like I said is if I pul the boat and put it back in the next morning first startup would not be an issue. Thanks for all the help you have been giving.

Ok I'll have to order that. My thoughts were also the variables. Like how much water is in the coolant passages when I pull the boat. I really leaning far away from a fuel issue but the gas in the tank is another thing that is moved a lot, I know very unlikely but could it be a vapor issue. The vent in the tank seems clear as I blew into it. The whole pulling the boat deal is what throws me the most. I'd hate to take it somewhere because they will more then likely throw parts at it and cost me money. I can throw parts myself but at least I can return them.

Well back again I've searched a few times and cannot find the info I'm looking for. Does anyone have wiring diagrams or a repair manual for the actual boat and not the engine. Vince from skidim advised me to check out my keypad and I'm not sure how it works but I'd like to test it.

Thank you everyone for your help especially Lewy. Even though I never physically could catch my injectors acting up I replaced them anyways just out of a good suspicion after i drove the boat 15 feet shut it off came down a hour later and needed to wot to get it to fire. Seems faulty injectors were my culprit.

As of now I am pretty much shooting in the dark here and using this post to keep track of the zillion things I have done.

Condition:
Boat fires right up pulling off the trailer. Drive short distance say 100 yards to the dock park the boat come back in about an hour sometimes boat will start and die others boat does not even fire it seems. After some extended cranking plugs are wet. After no start must WOT to get boat to fire then runs good until next long shutdown. I am currently throwing out the overnight cause because it does not seem to offer anything. Seems after first fire then shutdown is the real issue.

Tested/Replaced:
Fuel Pressue:40psi cranking
Map Sensor
Fuel Injectors
IAC Valve
ECT Sensor
Ignition Coil
Distributor
Cap/Rotor
Plugs and wires are around 1-2 years old with maybe low runtime.(Have a new set on the way)
TFI Module
ECM and F/P relays are only 1 year old.
Have Injector Pulse while cranking.
Have Spark while cranking.

Replaced the ect but also measured resistance before and it was good. For the $10 the sensor costs

I replaced the injectors

Lewy I have but I forgot to post the result and dont want to say what it did and did not do I will post back here soon with the results probably wont be out at the lake till this weekend but I want to say YES it did still start at WOT.

Lewy the boat did start with the tps off and WOT. I discovered this weekend with the FPR hose off the boat fired no matter what. It was odd i fired the boat with the hose off then put the hose back on and it chugged like it would barely run until it finally smoothed out. There is no evidence of fuel in the hose but it did smell terrible of fuel. I am thinking the problem is in the fuel system here wether a pump or regulator I am not sure yet. I did apply vac to the regulator and it did hold.

Sorry I typed wrong I had replaced both relays on the back not the ecm. I am just so skeptical about it being an exam because of the way the problem arises. I'm going to try a regulator. I may take the boat to someone after this. The cheapest I found an ecm
for was 675.

I see the first post says "solved" but I don't see the resolution in this thread..... What was the root cause? I have the same symptoms on a 1997 GT40. thanks