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erratic idle

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skyhawkflyer View Drop Down
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    Posted: September-19-2005 at 7:55pm
When you accelerate your no longer on the idle circuit. Good luck with the rebuild.
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Bob's2001 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bob's2001 Quote  Post ReplyReply Direct Link To This Post 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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88skisupreme View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 88skisupreme Quote  Post ReplyReply Direct Link To This Post Posted: September-19-2005 at 1:51pm
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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skyhawkflyer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote skyhawkflyer Quote  Post ReplyReply Direct Link To This Post Posted: September-14-2005 at 8:11pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 88skisupreme Quote  Post ReplyReply Direct Link To This Post Posted: September-12-2005 at 6:12pm
will check thanks for the advice, also forgot to mention it only does this once its warmed up.
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jameski View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jameski Quote  Post ReplyReply Direct Link To This Post Posted: September-12-2005 at 5:57pm
Also check the mechanical advance springs in your distributor.
current boat
94 Sport Nautique
previous boat
78 Martinique
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marks View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marks Quote  Post ReplyReply Direct Link To This Post Posted: September-12-2005 at 4:51pm
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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Jim_In_Houston View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim_In_Houston Quote  Post ReplyReply Direct Link To This Post Posted: September-12-2005 at 3:04pm
It is probably carb related. I concur with 79. Rebuilding the carb will probably reveal the problem.
Happy owner of a '66 and a '68 Mustang
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79nautique View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 79nautique Quote  Post ReplyReply Direct Link To This Post Posted: September-11-2005 at 6:10am
rebuild the carb, or you haven't located the vaccum leak yet
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88skisupreme View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 88skisupreme Quote  Post ReplyReply Direct Link To This Post 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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