GT-40 Won't Idle Down
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=37360
Printed Date: October-07-2024 at 2:25pm
Topic: GT-40 Won't Idle Down
Posted By: ddonaldson
Subject: GT-40 Won't Idle Down
Date Posted: September-18-2015 at 4:48pm
We run a 1965 Nautique with a GT-40. Occasionally (not all the time) when we idle down from "high throttle" the idle down does not respond and the engine "runs away" and we need to resort to turning the engine off. Sometimes engine will restart at idle normally. Other times engine is hard to start, will crank several revolutions, then stop cranking. This may happen a couple of times. If repeated enough, (and sometimes with a little throttle) engine will start.
What's going on. As usual intermittent problems are a pain.
All help appreciated.
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Replies:
Posted By: Jonny Quest
Date Posted: September-18-2015 at 5:17pm
Are you sure it is a 1965 with a GT40?
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Current
2003 Ski Nautique 206 Limited
Previous
2001 Ski Nautique Open Bow
1994 Ski Nautique Open Bow
Aqua skiing, ergo sum
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Posted By: Fl Inboards
Date Posted: September-18-2015 at 5:29pm
Do you have perfect pass on it?
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Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.
1993 Shamrock "fat" 20. 2008 Nautique 196 5.0
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Posted By: quinner
Date Posted: September-18-2015 at 5:30pm
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Probably meant 1995, do you have perfect pass?
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Posted By: Hollywood
Date Posted: September-18-2015 at 5:39pm
Posted By: 74Wind
Date Posted: September-18-2015 at 9:51pm
27 years old....Excuse me, while I kiss the sky....scarily prophetic, eh?
.
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1974 Southwind 18
1975 Century Mark II
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Posted By: ddonaldson
Date Posted: September-21-2015 at 1:56pm
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Forgive me - brain fart! 1996 Correct Craft with GT-40. Do not have Perfect Pass but do have Accuski. Have checked operation of the throttle control box of the Accuski and it is not hanging up (acting normally).
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Posted By: Bri892001
Date Posted: September-21-2015 at 3:15pm
Idle Air Control Valve possibly?
Solution would be to clean or replace.
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Posted By: jhersey29
Date Posted: September-21-2015 at 11:26pm
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Disconnect the throttle cable from the throttle body. It is only 1 nut and note the location of the washer so you reinstall the same. Does it idle down? What is the volts read on the throttle position sensor when at idle? It should be about 1..05 or less. Best under just under 1..
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Posted By: jhersey29
Date Posted: September-21-2015 at 11:28pm
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It could be as simple as someone bumped the bracket.that hold the throttle cable in place.. Can you send a picture of the bracket and throttle body with the spark arrestor off
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Posted By: Tim D
Date Posted: September-21-2015 at 11:47pm
Have you unhooked the vacuum line on the pressure regulator and see if the idle changes?
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Tim D
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