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Need Help GT-40 Trouble |
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1998Nautique 
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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 Topic: Need Help GT-40 TroublePosted: July-02-2008 at 6:46pm |
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My Gt-40 is still loseing power for a slpit second every once in a while here is a list of what I have done to try and solve it.
New LPP & HPP Cap and Rotor Plugs and Wires New Relays Cleaned Pick up Screen New Water Fuel Seperator Filter Checked all wires and added Dia-Electric Grease on all connections Any Ideas on anything else Thank You Any other ideas on what I can try. |
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beck
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Joined: July-01-2008 Location: Canada Status: Offline Points: 39 |
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Posted: July-03-2008 at 6:54pm |
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so does just everything quit out for a second like the engine and everything?
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1994 Sport Nautique 21ft 5.8L EFI Pro Tec Injection 310HP
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todicus
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Joined: July-10-2006 Location: Napa, Ca Status: Offline Points: 493 |
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Posted: July-03-2008 at 7:42pm |
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I thought you were going to replace the coil ? That's what was wrong with mine with the same symptoms. You might also need to replace the ECM unit.
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beck
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Joined: July-01-2008 Location: Canada Status: Offline Points: 39 |
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Posted: July-03-2008 at 7:46pm |
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like my boat everytime i hit a big wave it just quits and the circuit breaker blows i dont know where to look i know it has something to do with the iginition button cuz it happened and i couldnt push it back in for a while. and suggestions?
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1994 Sport Nautique 21ft 5.8L EFI Pro Tec Injection 310HP
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1998Nautique
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Posted: July-03-2008 at 10:10pm |
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I did change the coil Sorry I forgot to metntion that. Is a ECM expensive? Or any ideas. It doesn't all together quit it cuts out for a 1/2 a second.
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beck
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Joined: July-01-2008 Location: Canada Status: Offline Points: 39 |
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Posted: July-03-2008 at 10:54pm |
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anyone have any suggestions about what my problem is?
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1994 Sport Nautique 21ft 5.8L EFI Pro Tec Injection 310HP
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LakeBoy
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Joined: July-19-2006 Location: Roseville, CA Status: Offline Points: 709 |
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Posted: July-07-2008 at 5:16pm |
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I had the same problem with my '95 a couple of years back. I chased this one 'til I was nuts. I finally swerved into it: It was the fuel pump relay.
I was hoping that was you too. Another dude that was chasing the same issue found his "kill switch" lanyard set up was faulty. Another guy chased his to the fuse right at the battery. If you get a fuel pressure gauge you can measure the fuel pressure while running the boat. If your cutout is coincidental with a drop in pressure you can focus on the fuel delivery side of the equation. There is a module on the side of your distributor that I was told heats up and can jack some stuff up. Some auto guys told me that was a weak part of the 351 engine design. I never replaced it, but it was on my list. MY boat also had an in-line fuel filter that was clogged to beat the band. I was sure that was it. I could hardly blow thru it. To my horror it was not the culprit. Let me know how it goes! Toes up baby! PS. key word seach GT-40 and you may pick up other good stuff. |
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horkn
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Joined: September-10-2007 Location: Cedarburg, Wi Status: Offline Points: 1511 |
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Posted: July-07-2008 at 8:07pm |
That module on the distributor is called the TFI, Thick Film Ignition module. It is essentially a Hall effect sensor. These apparently have been known to go out at inopportune times, and there even was a class action lawsuit against ford for this. I never have had any real issues with these TFI modules, despite most of my vehicles having them. I had 1 go out on one of my 86 bronco 2's I had, but my 2 5.0 mustangs and the other 86 bronco 2, and the 89 bronco 2 my ex gf had never gave issues either. Between those 5 vehicles they had probably close to 2 million total miles. One bronco2 had like 415k on it when totalled by a drunk driver. So I don't think the problems are quite as bad as once suspected. Here is a tester for the TFI http://www.stangnet.com/tech/tfi.shtml And a little more info http://www.megamanual.com/ms2/TFI.htm |
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78 martinique- refloored, reinforced, stringers re glassed, re engineered interior
GT40P heads Edelbrock Performer intake acme 4 blade http://img.photobucket.com/albums/v64/horkn/fish/nautique.jpg |
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1998Nautique
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Posted: July-08-2008 at 5:59pm |
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Mine is wired direct to the battery? Anything else I can check?
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jerg
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Joined: August-22-2006 Location: Canada Status: Offline Points: 3 |
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Posted: August-10-2008 at 8:07pm |
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Did you check the 20 Amp fuse right after the battery that it's not loose or cracked?
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LakeBoy wrote: