EFI GT40 HElP and opinions |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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! |
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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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 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 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 |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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.
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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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. |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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would the ignition problem be keeping my fuel pumps from priming?
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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. :( |
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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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. |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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Anyone recommended on this site who says things like that must be falsifying his identity as a CCF'er.
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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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 EEC Retrofit thread will help if you still have this fuse. |
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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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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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Lewy2001 is da GT-40 man.
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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.
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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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 |
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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This is the EEC fuse I was talking about when I updated earlier post.
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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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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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?
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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No--but that dang fuse could be what ails you.
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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if it is that freaking fuse i am going to puke.
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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.
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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jbear
Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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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 |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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anyone know how many ohms of resistance that eec fuse is supposed to have?
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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jbear
Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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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 |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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I think that's an in-line fuse holder. Just pop it open and see if it's blown or not.
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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doesnt look blown. testing resistance with a multimeter now and getting now resistance from it.....
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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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. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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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 |
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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! |
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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Dreaming
Platinum Member Joined: May-21-2010 Location: Tacoma, WA Status: Offline Points: 1870 |
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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.
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DVskier
Senior Member Joined: September-04-2014 Location: Seneca SC Status: Offline Points: 449 |
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Then just look for smoke!
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jellison
Groupie Joined: September-19-2014 Location: winter park, fl Status: Offline Points: 44 |
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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. |
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MY BOATS:
1988 Ski Nautique (SOLD) 1998 Air Nautique |
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sport1999
Senior Member Joined: May-10-2015 Location: Florida Status: Offline Points: 313 |
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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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tryathlete
Platinum Member Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1796 |
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Victory. Simplest cheapest fix besides the lanyard
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