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Poor Man's GT40 Diagnosis

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Keith View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Keith Quote  Post ReplyReply Direct Link To This Post Posted: January-16-2013 at 3:40pm
Looks like Nautiqueparts is selling the heatsink as well. You don't need the entire assembly, just the black TFI. Your old heatsink should be perfectly fine.

-Keith
97 Sport Nautique
Former:
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: May-08-2013 at 9:15pm
Replacing Gunked Up Low Pressure Fuel Pump Fixes No Start Condition:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=29362&title=gt40-wont-start
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MI-nick Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2013 at 11:48am
Brian,
i suspect that just cleaning the screen/pump would have fixed the problem too.
As far as I can tell, I'm not quite sure...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2013 at 2:33pm
That's true, makes sense.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MI-nick Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2013 at 2:44pm
an a lot cheaper...
As far as I can tell, I'm not quite sure...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2013 at 3:04pm
LOL. Definitely. Thanks for closing the loop on the thread too, that makes it a good reference.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MI-nick Quote  Post ReplyReply Direct Link To This Post Posted: May-09-2013 at 4:27pm
no problem. i've learned a ton from this site so I try to give back when I can.
As far as I can tell, I'm not quite sure...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-01-2013 at 9:04am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-31-2013 at 12:00pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-12-2013 at 8:37pm
New spark plugs and corrected plug wire firing order fixes lost power and missing:

http://www.correctcraftfan.com/forum/forum_posts.asp?TID=30980&title=loss-of-power
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: September-17-2013 at 3:30am
Full ignition tuneup, spark plugs, wires, cap and rotor fixes high rpm hesitation problem:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=31451&title=pcm-proboss-gt40-mp-efi-rpm-failures

Updated Spreadsheet
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Post Options Post Options   Thanks (0) Thanks(0)   Quote OrlandoGuy82 Quote  Post ReplyReply Direct Link To This Post Posted: October-21-2013 at 3:33pm

I had this same issue with my 97 GT-40 Sport. There is a tube going down into the tank and at the top of it was a little mesh filter. The crud got up the tube and clogged it. I blew out the wad of crud and runs perfect now. Of course this means I need to take the tank out and clean it. I also cleaned the anti-siphon valve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote td_in_nc Quote  Post ReplyReply Direct Link To This Post Posted: January-05-2014 at 4:13pm
I test drove a 1998 Air Nautique with a GT-40 which had been sitting for a while, only run a couple time in two years. When I was accelerating hard, it would intermittently (once every 3rd time or so) slow down for a split second and the engine light would come on, then it would continue to accelerate and the engine light would go out. It seemed like momentary hesitation, light comes on, then everything was fine. I passed on the boat because of this, but I just wanted to see if I am being over cautious on a simple fix. The boat ran great other than this and the compression was good
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lewy2001 Quote  Post ReplyReply Direct Link To This Post Posted: January-05-2014 at 4:32pm
That is the "SLOW" limp mode on the GT40 engine. The GT40 uses extra switches (not senders) to sense low oil pressure and high engine temp. The computer then limits rpms.

Easy to trouble shoot just remove wiring from both switches.

If you're going through hell, keep going

89 Ski

<a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: June-06-2014 at 8:36pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: June-09-2014 at 8:07am
Fuel Pump Related Cutout solved by fixing/replacing lanyard kill switch. These kill switches cut out the fuel, not the ignition:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=33651&title=fuel-pumps

Added rows for Faulty Kill Switch:
https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: June-19-2014 at 10:49pm
Check Engine light and Sputtering "Limp Mode" fixed by replacing Oil Pressure Switch as described here:
http://correctcraftfan.com/forum/forum_posts.asp?TID=12307&title=check-engine-light-on-sputtering
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-07-2014 at 9:32pm
Engine starts very briefly then stalls out.

Solved by cleaning or replacing antisiphon valve as described here:

http://correctcraftfan.com/forum/forum_posts.asp?TID=33867&title=engine-dont-start-then-stop

Updated spreadsheet:
https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 7golfman Quote  Post ReplyReply Direct Link To This Post Posted: July-09-2014 at 9:39pm
Keith, How did you determine it was the TFI? My 97 GT40 has the same symptoms.
7golfman
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2014 at 12:42am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: July-21-2014 at 9:29pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote the good ag Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2014 at 7:19pm

Great idea, thank you for initiating.   My 1997 has been great with the exception of an relay replacement about 5 yrs ago until I started having the issues I posted on the fuel supply.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-07-2014 at 8:27pm
Loss of Power, hesitation, rough idle and reduced top speed fixed with complete rebuilt distributor, as described here:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34211&title=97-sn-loss-of-power-top-speed-rough-idle
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-26-2014 at 7:10am
Another kill switch causing fuel pump to come on. Fixed by bypassing kill switch. This one was a new post on an existing, older, thread. Starts here at August-02-2014 at 5:13pm by the good ag
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25775&PID=440815#440815

Spreadsheet Updated
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-26-2014 at 7:27am
Faulty wiring from ECM to Fuel Pump Relay caused intermittent no start condition. Fixed by making new wire:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=33867&PID=443360#443360

Also updated spreadsheet, same link as above.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: August-26-2014 at 7:33am
Bad Fuel, water in fuel, causing no start or run:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34012&PN=1&title=gt40-probs

Also updated spreadsheet, same link as above.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: September-02-2014 at 7:52am
A hard hot start (running then sitting for an hour or long enough for heat soak) issue turns into a never start condition. This is solved with a new low pressure fuel pump, here:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34248&PID=444293#444293

Spreadsheet updated
https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: September-02-2014 at 7:57am
Another hard hot starting issue. Solved by replacing both high and low pressure fuel pumps:
Note, this in the pervious are links to specific posts in the same thread. This one refers to PT Skier's post:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34248&PID=443571#443571

Updated spreadsheet, same link as previous.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: September-14-2014 at 1:43pm
Stuttering hesitation problem seems to be solved by replacement fuel filter.
This is after full ignition tuneup, and replacement of both pumps and relays:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34259&PID=444959#444959

Updated Spreadsheet:
https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: November-30-2014 at 10:51pm
Resetting a breaker in the PME Breaker Box, fixes a condition where the engine will start and run until the operator lets go of the starter button. Here:

http://www.correctcraftfan.com/forum/forum_posts.asp?TID=35039&PN=1&title=gt40-stops-after-letting-go-of-button

Updated Spreadsheet:
https://docs.google.com/spreadsheets/d/17VemuIOaa9i8kEply-ZmFOSyjyzz8rd7B0WEuIT_6S0/edit?usp=sharing

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