EFI GT40 HElP and opinions
Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=38652
Printed Date: April-28-2024 at 10:03pm
Topic: EFI GT40 HElP and opinions
Posted By: jellison
Subject: EFI GT40 HElP and opinions
Date Posted: May-17-2016 at 7:30pm
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ok so here is the story. I have a 98 air with a GT40 EFI set up and the boat has decided after running fine for a long time to start acting up. I have tested for fuel and spark and i have neither. The boat cranks (turns) but never actually fires. Currently I have tried testing the fuel pumps with a test light and even jumped them off of the main power wire to see if they would run when getting a constant 12 V. Both pumps work flawlessly. I have a new cap and rotor installed as well as a new ICM, coil, wires and plugs... but no spark. When i test my connection at the coil i dont see 12v. So long story short..... I have an electrical problem that is keeping the boat from sending 12V to the ignition and fuel systems. Could this be a bad computer?! Bad Wiring harness? what the heck is going on here. I honestly am so over fuel injection that I want to rip it out and convert the boat to a carb set up. My last boat was a carb set up and the boat fired everytime after it was primed. Have you guys ever hear of this happening? And am i crazy for wanting to convert back to a carb set up?! My pros and cons are as follows. I could be crazy and buy a new ECM and wiring harness for the boat at a cost of around 1300 bucks (estimate) and it work fine or i still have the problem after all of that. Or i could convert to carb for around the same price and eliminate all the crappy wiring on the engine and hopefully it solves the problem. The way i see it is that with EFI i have 4 things that have to happen for the motor to fire correctly (fuel, air, spark and the dreaded electricity) and with a carb i only have 3 and it eliminates (to some degree) the electrical computer component. HELP GUYS! ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Replies:
Posted By: Gary S
Date Posted: May-17-2016 at 8:50pm
Yea your crazy to want to convert. You just have to learn a new skill. If your cell phone quits you go get help, you don't go and get a land line  Read thru this http://www.correctcraftfan.com/Downloads/Pro_BOss_GT-40_Service_Manual.pdf" rel="nofollow - GT40 service manual it tells you how the system works and how to test. From my reading ECM's rarely go bad but it could even be a TFI module. You might need one of http://www.ebay.com/itm/Innova-OBD-I-Code-Reader-3145-/331373440502?hash=item4d27656df6:g:VRAAAOSwrklU~1ic&item=33137344050" rel="nofollow - these to read codes,but remember not all faults trigger a code. Do some reading and do some tests and let us know what you find ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: jellison
Date Posted: May-17-2016 at 8:57pm
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sorry. i said ICM... i meant TFI-IV. The problem is those parts arent even getting power. im so frustrated. ive never had this much trouble with a correct craft boat. ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: tryathlete
Date Posted: May-17-2016 at 9:00pm
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The fuel injection when properly sorted out is reliable and really enhances performance and economy. You've got an ignition problem not fuel. You'd make more sense replacing your distributor than putting a carb on it! The GT-40 is awesome once sorted out as you already know. |
Posted By: jellison
Date Posted: May-17-2016 at 9:07pm
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would the ignition problem be keeping my fuel pumps from priming? ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: jellison
Date Posted: May-17-2016 at 9:09pm
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ive had a mechanic look at it and he gave up after 30 min. he insulted my boat and said the cover is worth more than the interior.... this guy was highly recommended on this site too. :( ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: tryathlete
Date Posted: May-17-2016 at 9:18pm
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Check the PCM manual Section 3 chart 4 in the troubleshooting guide for "cranks but does not start, . Gary's idea is one prognosis but connections are culprits too. Read through the manual And act logically and you'll get there quickly and less expensively. |
Posted By: tryathlete
Date Posted: May-17-2016 at 9:19pm
| Anyone recommended on this site who says things like that must be falsifying his identity as a CCF'er. |
Posted By: lewy2001
Date Posted: May-17-2016 at 9:29pm
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This is the diagram to work from if you have no power to coil check terminal 87 on EEC relay for 12 volts. (Page 6-10 of manual). The ECM power cct on your 98 also may not have been retrofitted. The inline 50 amp fuse item 14 in diagram was a known problem PCM released a modification to delete this fuse. It is located in the battery box. This http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25723&KW=&title=gt40-retrofit-computer-power" rel="nofollow - EEC Retrofit thread will help if you still have this fuse.  ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: tryathlete
Date Posted: May-17-2016 at 9:42pm
| Lewy2001 is da GT-40 man. |
Posted By: jellison
Date Posted: May-17-2016 at 9:45pm
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im printing the ENTIRE manual right now. hahhaa. this thing is 301 pages long. haha. i guess it will be more than a toilet read this evening. ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: Gary S
Date Posted: May-17-2016 at 9:50pm
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Technically your not having trouble with your Correct Craft boat,your having a problem with a Ford engine management system and with the exception of having no oxygen sensors much the same as an early 90's up to 95 Ford car or light truck. I did not realize you had no fuel pumps either. Mark is the expert here,follow what he says ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: lewy2001
Date Posted: May-17-2016 at 10:02pm
This is the EEC fuse I was talking about when I updated earlier post. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: jellison
Date Posted: May-17-2016 at 10:12pm
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ahhhhh lewy! i am going to check that tomorrow. wouldnt that keep me from getting any power to the back of the engine at all though? ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: tryathlete
Date Posted: May-17-2016 at 11:06pm
| No--but that dang fuse could be what ails you. |
Posted By: jellison
Date Posted: May-17-2016 at 11:08pm
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if it is that freaking fuse i am going to puke. ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: jellison
Date Posted: May-17-2016 at 11:09pm
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i just read that thread lewy posted and it looks like that fuse would keep power from making it to the eec which im guessing would keep the pumps from priming and prevent the coil from sending spark to the dist. ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: jbear
Date Posted: May-17-2016 at 11:19pm
LOL....one of the reasons we are retired....not much use for twisted copper anymore. One thing for sure....everytime I read one of these threads I am all the more thankful for my partner Eddie... john ------------- "Loud pipes save lives" AdamT sez "I'm Canadian and a beaver lover myself"... |
Gary S wrote:Posted By: jellison
Date Posted: May-17-2016 at 11:28pm
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anyone know how many ohms of resistance that eec fuse is supposed to have? ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: jbear
Date Posted: May-17-2016 at 11:28pm
LOL....one of the reasons we are retired....not much use for twisted copper anymore. One thing for sure....everytime I read one of these threads I am all the more thankful for my partner Eddie... john ------------- "Loud pipes save lives" AdamT sez "I'm Canadian and a beaver lover myself"... |
Posted By: tryathlete
Date Posted: May-17-2016 at 11:30pm
| I think that's an in-line fuse holder. Just pop it open and see if it's blown or not. |
Posted By: jellison
Date Posted: May-17-2016 at 11:33pm
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doesnt look blown. testing resistance with a multimeter now and getting now resistance from it..... ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: Gary S
Date Posted: May-17-2016 at 11:40pm
You are correct. Mine is an all black wire,when I first got the boat,I repaired all the battery terminal ends. I hooked that black wire to the - side of the battery and no start. Quinner comes over and says why does a wire on the - side have a fuse? Well duh! Looking at a good fuse on the ohm scale it should read the same as when you touch both leads together. If the fuse is blown it would read the same as if the leads do not touch. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Gary S
Date Posted: May-18-2016 at 12:00am
It's going to be soon that you'll see more problems like these,the newest Ford being something like 14 years old already. Pretty soon even the dealers won't have anyone who knows them either. Mark will be in demand with what he has done with them  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: jellison
Date Posted: May-18-2016 at 12:13am
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just tested the fuse.... looks to be dead. multimeter is not moving at all. tested three fuses that i know are brand new and good and the meter moves to zero. i think you guys might be right.... this fuse could be bad..... I will repost tomorrow afternoon when i get off work at 1. thanks for all the help guys! ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: Dreaming
Date Posted: May-18-2016 at 4:26pm
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Fuses should always ohm out at "0" or near... they are a current path and should provide no resistance if they are good. if they are bad (as you have discovered) they are open and provide infinite resistance. I believe the retrofit is to remove the fuse, (connect the two sides of the fuse wire, removing the fusing path. they do make blade style fuses as well that have a waterproof enclosure. |
Posted By: DVskier
Date Posted: May-18-2016 at 5:24pm
| Then just look for smoke! |
Posted By: jellison
Date Posted: May-18-2016 at 5:26pm
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problem solved!!!!!!!! it was the fuse. put a new one in to hold us over till after memorial day and then i will do the fuse delete as shown above! you guys are amazing. Big thanks to Lewy! On more question though.... what is the normal running temp of a GT40? I have replaced all the sending units and i think i have a bad gauge. I hooked up a manual gauge on top of the manifold and it seems to be holding a steady 160 ish..... Impeller is new so it is not that. ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: sport1999
Date Posted: May-18-2016 at 6:13pm
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GT-40s have a 160. Carb'd usually 143. Great to see your problem solved so quickly! Go Lewy 
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Posted By: tryathlete
Date Posted: May-18-2016 at 9:04pm
| Victory. Simplest cheapest fix besides the lanyard |
Posted By: 8122pbrainard
Date Posted: May-18-2016 at 10:08pm
Jason, I sure hold you inform that "mechanic" you took it to and couldn't figure out the problem!  BTW, did he work out of his back yard? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: jellison
Date Posted: May-18-2016 at 10:08pm
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im so grateful. this forum just saved my memorial day :) ------------- MY BOATS: 1988 Ski Nautique (SOLD) 1998 Air Nautique |
Posted By: Bri892001
Date Posted: May-19-2016 at 9:11am
Great that you found the fix  I added this one to the: http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25584&PN=1&title=poor-mans-gt40-diagnosis" rel="nofollow - http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25584&PN=1&title=poor-mans-gt40-diagnosis thread. I put the fix in the row in the spreadsheet next to: Fused Line in Batt Box For EEC Power |
Posted By: 8122pbrainard
Date Posted: May-19-2016 at 9:39am
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Has anyone heard why the fuse is blowing? There's always a reason for blown fuses. What other overcurrent protection is there for the EEC after the fuse is eliminated? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Gary S
Date Posted: May-19-2016 at 10:36am
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Joel found out about it,Mark did a write up http://www.correctcraftfan.com/forum/forum_posts.asp?TID=25723&KW=&title=gt40-retrofit-computer-power" rel="nofollow - here ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: May-19-2016 at 10:47am
Gary, Thanks. Interesting thread! Mark sure is our guy to investigate and come up with the solution. PCM or CC must have had their wiz "EE" on the original wiring/fusing! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: ChrisNautique
Date Posted: May-29-2016 at 8:34am
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what size fuse? ------------- Chris |
Posted By: 8122pbrainard
Date Posted: May-29-2016 at 8:59am
Chris, Note that the solution is deleting the fuse. Go back in this thread to the link to the complete thread regarding removing the fuse. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: ChrisNautique
Date Posted: May-29-2016 at 1:24pm
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What type and size fuse ------------- Chris |
Posted By: Bri892001
Date Posted: May-29-2016 at 2:08pm
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No fuse. No AND THEN!! https://youtu.be/GKNX6dieVcc" rel="nofollow - https://youtu.be/GKNX6dieVcc |
Posted By: gun-driver
Date Posted: May-29-2016 at 2:30pm
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50 amp http://ll-us-i5.wal.co/dfw/dce07b8c-85d8/k2-_b706fe98-22f6-454a-8010-b8542b3bf3d5.v2.jpg" rel="nofollow - http://ll-us-i5.wal.co/dfw/dce07b8c-85d8/k2-_b706fe98-22f6-454a-8010-b8542b3bf3d5.v2.jpg |
Posted By: ChrisNautique
Date Posted: May-30-2016 at 8:28am
How funny  ------------- Chris |
Posted By: 8122pbrainard
Date Posted: May-30-2016 at 9:48am
Yes, funny since you seem to have the same problem I have at times. I think the acronym is "ADD"! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |