erratic idle
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=2419
Printed Date: November-23-2024 at 3:35am
Topic: erratic idle
Posted By: 88skisupreme
Subject: erratic idle
Date Posted: September-10-2005 at 8:54pm
Friend's boat has a weird idle, it revs up and down. Ocassionally dies but usually just keeps running with the idle like that. Runs fine at crusing speed. Sometimes the idle straightens out for a few second and then goes back to the reving up and down.
checked for vaccum leaks, pcv valve replaced, any more ideas? Carb related maybe?
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Replies:
Posted By: Guests
Date Posted: September-11-2005 at 6:10am
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rebuild the carb, or you haven't located the vaccum leak yet
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Posted By: Jim_In_Houston
Date Posted: September-12-2005 at 3:04pm
It is probably carb related. I concur with 79. Rebuilding the carb will probably reveal the problem.
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Happy owner of a '66 and a '68 Mustang
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Posted By: marks
Date Posted: September-12-2005 at 4:51pm
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It does sound like a carb problem, but before you do the rebuild, do a tune-up on the engine and make sure to check the timing. When I bought my boat, the idle was inconsistent. I found the root cause was the timing being off by 10 degrees.
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Posted By: jameski
Date Posted: September-12-2005 at 5:57pm
Also check the mechanical advance springs in your distributor.
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current boat
http://www.correctcraftfan.com/diaries/details.asp?ID=1977 - 94 Sport Nautique
previous boat
http://www.correctcraftfan.com/diaries/details.asp?ID=601 - 78 Martinique
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Posted By: 88skisupreme
Date Posted: September-12-2005 at 6:12pm
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will check thanks for the advice, also forgot to mention it only does this once its warmed up.
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Posted By: Guests
Date Posted: September-14-2005 at 8:11pm
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If it's a holley a popped power valve will do just that. Fuel leaking through will affect the idle circuit and wreak havock with the forward float, causing the surge. Good luck
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Posted By: 88skisupreme
Date Posted: September-19-2005 at 1:51pm
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I dont think its the power valve, it takes off just fine everytime even pulling wakeboarders up, only problem is at idle. I'm thinking its carb rebuild time.
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Posted By: Bob's2001
Date Posted: September-19-2005 at 3:49pm
Check at the base of the carb. Mine was acting the same way and it had a vacuum leak between the carb & manifold.
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Bob Ed
83 2001
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Posted By: Guests
Date Posted: September-19-2005 at 7:55pm
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When you accelerate your no longer on the idle circuit. Good luck with the rebuild.
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