Boats For Sale:
Poor Man's GT40 Diagnosis |
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Keith 
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Owner / Operator of CorrectCraftFan.com Joined: October-20-2003 Location: Pepperell, MA Status: Offline Points: 1917 |
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 Posted: January-16-2013 at 5:40pm |
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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 |
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Bri892001
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Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Posted: May-08-2013 at 11:15pm |
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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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MI-nick
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Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: May-09-2013 at 1:48pm |
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Brian,
i suspect that just cleaning the screen/pump would have fixed the problem too. |
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As far as I can tell, I'm not quite sure...
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Bri892001
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Posted: May-09-2013 at 4:33pm |
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That's true, makes sense.
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MI-nick
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Posted: May-09-2013 at 4:44pm |
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an a lot cheaper...
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As far as I can tell, I'm not quite sure...
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Bri892001
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Posted: May-09-2013 at 5:04pm |
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LOL. Definitely. Thanks for closing the loop on the thread too, that makes it a good reference.
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MI-nick
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Posted: May-09-2013 at 6:27pm |
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no problem. i've learned a ton from this site so I try to give back when I can.
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As far as I can tell, I'm not quite sure...
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Bri892001
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Posted: July-01-2013 at 11:04am |
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New Distributor Stator (PIP Sensor) solves no start condition. Here:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=30443&title=sn95-wont-start Updated Spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing Part: http://www.skidim.com/prodinfo.asp?number=MP716SB |
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Bri892001
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Posted: July-31-2013 at 2:00pm |
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New Spark Plug Wires fix surging issue:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=22823&PID=402007#402007 |
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Bri892001
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Posted: August-12-2013 at 10:37pm |
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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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Bri892001
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Posted: September-17-2013 at 5:30am |
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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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OrlandoGuy82
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Joined: October-09-2013 Location: Orlando Status: Offline Points: 2 |
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Posted: October-21-2013 at 5:33pm |
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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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td_in_nc
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Joined: March-30-2012 Location: Clayton NC Status: Offline Points: 381 |
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Posted: January-05-2014 at 6:13pm |
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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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lewy2001
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Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Posted: January-05-2014 at 6:32pm |
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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. 
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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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Bri892001
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Posted: June-06-2014 at 10:36pm |
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No spark condition fixed by replacing Relays as Described here:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=33681&title=95-sn-ob-gt40-no-spark Updated Spreadsheet |
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Bri892001
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Posted: June-09-2014 at 10:07am |
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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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Bri892001
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Posted: June-20-2014 at 12:49am |
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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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Bri892001
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Posted: July-07-2014 at 11:32pm |
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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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7golfman
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Joined: August-18-2011 Status: Offline Points: 40 |
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Posted: July-09-2014 at 11:39pm |
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Keith, How did you determine it was the TFI? My 97 GT40 has the same symptoms.
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7golfman
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Bri892001
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Posted: July-12-2014 at 2:42am |
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Abrupt Engine Shutoff/no-start solved by replacing relay:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34100&title=97-gt40-sudden-motor-shutoff-hard-or-want-start Updated Spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing |
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Bri892001
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Posted: July-21-2014 at 11:29pm |
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Removal, disassembly and cleanup of ECM solves Bank 1 Injectors not Pulsing as described here:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=34190&title=bank-1-efi-problem Updated Spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0AjRJOCEx-NOidGcyLTVIOFBrZnVnOURXYjU2NUpFSkE&usp=sharing |
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the good ag
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Joined: August-02-2014 Location: Texas Status: Offline Points: 10 |
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Posted: August-02-2014 at 9:19pm |
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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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Bri892001
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Posted: August-07-2014 at 10:27pm |
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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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Bri892001
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Posted: August-26-2014 at 9:10am |
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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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Bri892001
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Posted: August-26-2014 at 9:27am |
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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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Bri892001
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Posted: August-26-2014 at 9:33am |
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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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Bri892001
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Posted: September-02-2014 at 9:52am |
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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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Bri892001
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Posted: September-02-2014 at 9:57am |
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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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Bri892001
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Posted: September-14-2014 at 3:43pm |
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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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Bri892001
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Posted: December-01-2014 at 12:51am |
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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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