PCM GT40
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=22376
Printed Date: May-03-2024 at 4:42am
Topic: PCM GT40
Posted By: 1765MB
Subject: PCM GT40
Date Posted: July-01-2011 at 10:04am
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I just bought a model year 2001 ski nautique with a PCM GT-40 w/ fuel injection that sat is storage for 1 year. I put a couple of hours on it with no issues. However, last night I took it out and it ran fine until I got to about 2600 rpms and then it bogged down. When I brought it back under 2600 rpms it ran fine again. Any Ideas? By the way the boat has only 70 hours on it and has been professionally maintained.
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Replies:
Posted By: horkn
Date Posted: July-01-2011 at 11:47am
Sounds like it isn't getting the fuel it needs.
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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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Posted By: scottb
Date Posted: July-01-2011 at 1:49pm
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Is the check engine light on? If it will not go above 2500 rmp, then it sounds like it may be in SLOW mode, which means you probably have a problem with your oil pressure switch or temp switch. I think there is a GT-40 service manual in the reference section. The service manual will help you locate the switches. If the problem is caused by one of these switches, you can disconnect one at a time to isolate the problem. Start with the oil pressure switch.
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Posted By: 1765MB
Date Posted: July-01-2011 at 3:47pm
The check engine light did not come on but I will follow your suggestion and reference the service manual to isolate the switches
Thanks
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Posted By: Luchog
Date Posted: July-02-2011 at 2:59pm
did you ever look at the fuel filter?
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http://www.correctcraftfan.com/diaries/details.asp?ID=2095" rel="nofollow - 1980 Ski Nautique
Commander 351W
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Posted By: 1765MB
Date Posted: July-02-2011 at 4:06pm
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The fuel filter is good, this issue is very consistent at 2600 rpm and seems like the engine goes into a safety mode. I think the advice to check the oil and temp switches is on the right track. Its probably a sender thats gone bad, or something along that line. I won't know for a few days as other events will keep me from foolin around with the boat but I'll post the solution when I get it.
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