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erratic idle |
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88skisupreme 
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Joined: September-13-2004 Location: United States Status: Offline Points: 50 |
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 Topic: erratic idlePosted: September-10-2005 at 8:54pm |
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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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79nautique
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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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Jim_In_Houston
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Joined: September-06-2004 Location: United States Status: Offline Points: 1120 |
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Posted: September-12-2005 at 3:04pm |
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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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marks
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Joined: April-23-2004 Location: United States Status: Offline Points: 96 |
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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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jameski
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Joined: May-18-2004 Location: United States Status: Offline Points: 368 |
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Posted: September-12-2005 at 5:57pm |
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Also check the mechanical advance springs in your distributor.
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88skisupreme
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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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skyhawkflyer
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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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88skisupreme
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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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Bob's2001
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Joined: March-28-2005 Location: Lake Jackson TX Status: Offline Points: 241 |
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Posted: September-19-2005 at 3:49pm |
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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
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skyhawkflyer
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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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