Nice Whistle
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Freshman User
Joined: Mar 2016
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Nice Whistle
My 69 240 I6 has started whistling after I get up past 50mph.
If im speeding up it goes away, but after I let off just a little I get a nice loud whistle again. When I shut the truck off it goes away and does not come back tell I get it back up to speed. any thoughts?
If im speeding up it goes away, but after I let off just a little I get a nice loud whistle again. When I shut the truck off it goes away and does not come back tell I get it back up to speed. any thoughts?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Not much to go on... Can you clue us in on where it **might** be coming from? Front, back, underneath??????????????????
Is it a whistle like an air leak or more of a sustained screech???
I'm thinking a loose or glazed drive belt but dunno.......
Is it a whistle like an air leak or more of a sustained screech???
I'm thinking a loose or glazed drive belt but dunno.......
Senior User
Joined: Oct 2015
Posts: 445
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From: Bismarck, ND
Sounds like a vacuum leak as HIO said. But a whistle from a vacuum leaks is pretty weird. Spray some carb cleaner around the base and vacuum lines of your carb and note of any idle changes and for the whistling to stop.
Assuming it is a vacuum leak it seems to be from the heat of the engine causing expansion of some sort
Assuming it is a vacuum leak it seems to be from the heat of the engine causing expansion of some sort
Logistics Pro
Joined: Aug 2015
Posts: 4,093
Likes: 14
From: Lind, WA- Eastern WA
What tune is it whistling? Sorry, I got carried away. IF it's not around the carb (Spacer gasket?) AND the vacuum lines and caps are good, then check the belts and the pulleys. Check the water pump for a leak around the shaft (maybe the bearing is going bad?). I like the whistling tune in the latest Maytag commercial, now I can't get it out of my head.
Posting Guru
Joined: Mar 2016
Posts: 1,412
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From: Barre Mass
Both my 95 f150 300 I6 and my 94 Bronco 5.0 had a whistle but only when temps below 20 deg. I think its a Ford thing. Something I never figured out.
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Senior User
Joined: Jul 2015
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Sounds like a vacuum leak as HIO said. But a whistle from a vacuum leaks is pretty weird. Spray some carb cleaner around the base and vacuum lines of your carb and note of any idle changes and for the whistling to stop.
Assuming it is a vacuum leak it seems to be from the heat of the engine causing expansion of some sort
Assuming it is a vacuum leak it seems to be from the heat of the engine causing expansion of some sort
I had this once and it turned out to be one bolt holding the carb down had loosened enough to allow it to suck air in at that corner and cause a whistle.
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