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Unread 10-01-2013, 03:01 PM   #1
bluedaffy
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point, Wisconsin
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Whistles @ part-throttle

My 4.2 YJ whistles a bit when I'm at part throttle, I'd say about 50% into the gas pedal. The funny thing is, if I am 0-40% or 60-100% into the gas pedal it is gone, so I'm thinking it is probably something with the carb? I have a weber 32/36 installed. I would assume that a typical carb air leak would whistle all the time, not just at part throttle, but I'm no expert so I can't be sure.

Another possibility might be the breather hose on the back of the valve cover that is connected to the air box? Maybe the fitting has just the right diameter to whistle or something? Anybody know what a whistle at part throttle might be caused by?

Also, it's not terribly loud or anything, but it's enough to drive me crazy because it whistles at the throttle position that I'm usually at!

Thanks.

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Unread 10-01-2013, 05:30 PM   #2
AZdEvilYJ
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1995 YJ Wrangler 
 
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Quote:
Originally Posted by bluedaffy
My 4.2 YJ whistles a bit when I'm at part throttle, I'd say about 50% into the gas pedal. The funny thing is, if I am 0-40% or 60-100% into the gas pedal it is gone, so I'm thinking it is probably something with the carb? I have a weber 32/36 installed. I would assume that a typical carb air leak would whistle all the time, not just at part throttle, but I'm no expert so I can't be sure. Another possibility might be the breather hose on the back of the valve cover that is connected to the air box? Maybe the fitting has just the right diameter to whistle or something? Anybody know what a whistle at part throttle might be caused by? Also, it's not terribly loud or anything, but it's enough to drive me crazy because it whistles at the throttle position that I'm usually at! Thanks.
I would check your lines leading in and out of your intake system (ie carb/air cleaner/vac lines). When I switched out my carbed 350 air cleaner with a hi flow and when I didn't cinch up my intake on my 2.5 I had whistles. I'd start there
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Unread 10-01-2013, 05:39 PM   #3
jsawduste
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Normal, some are worse then others.
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Unread 10-01-2013, 06:08 PM   #4
captainauti
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im betting a vacuum leak at the base of the carb. can you make it do it in park by throttling up? if so, use wd40 spray or propane around the base and see if it quiets.
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