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2009 f150 4wd, tinny noise when accelerating

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  #1  
Old 05-06-2017, 12:42 PM
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2009 f150 4wd, tinny noise when accelerating

2009 f150 4wd, tinny noise when accelerating.It just started a week ago. When accelerating in two wheel drive mode only. When i switch to 4high while driving under 60 kilometers / hr the noise stops. ANy idea what could cause this?
 
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  #2  
Old 05-06-2017, 01:50 PM
glc
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Probably the IWE system, it's losing vacuum somewhere.

https://www.f150online.com/forums/ar...then-some.html
 
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  #3  
Old 05-10-2017, 11:04 AM
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thanks for the help, turned out to be a wheel bearing, cost $400.00,
 
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  #4  
Old 05-11-2017, 02:55 PM
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must be more wrong than just bearing, noise is back, guess i'm going to ford dealership
 
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  #5  
Old 05-11-2017, 09:12 PM
glc
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Read the thread I linked.
 
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  #6  
Old 05-12-2017, 02:30 AM
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Does it sound like a rattling noise coming from one or both wheels? Like mentioned above, possibly 4wd hubs trying to engage. Get a vacuum tester, check the lines like the thread says. Or just get you a new check valve, $10, takes 30 seconds to swap out, and it's likely the fault, as they go bad and don't hold a vacuum well under load.
 
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  #7  
Old 05-19-2017, 12:23 PM
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replaced the valve ($88 in Ontario Canada), no improvement, guess it's off to Ford, thanks everyone for the help anyway
 
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  #8  
Old 05-19-2017, 02:58 PM
glc
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What troubleshooting steps led you to replacing the valve?
 
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  #9  
Old 05-19-2017, 11:38 PM
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What valve did you replace that cost $88, Canadian or American? It's a cheap plastic check valve.

​​​​​​​ to properly diagnose read that thread and check the vacuum though.
 
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  #10  
Old 05-22-2017, 06:26 PM
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the $88 dollars was canadian funds

the $88 dollars was canadian funds, purchased from for dealership here in brampton, ontario. part # 6L3Z-9H465-B
 
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  #11  
Old 05-23-2017, 01:01 AM
glc
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Originally Posted by glc View Post
What troubleshooting steps led you to replacing the valve?
^^^
 
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  #12  
Old 05-23-2017, 01:06 PM
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That's why it was more, you replaced the entire switch. The cheap check valve is motorcraft part# YG429, for my 2010 anyway. It holds the vacuum and only allows air to flow one way.
 
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  #13  
Old 06-01-2017, 12:34 AM
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an update on this thread in case it could help others, I gave in and took it local Ford dealership, after 2 days I got the "Actuator assy" (7L1Z3C247A) put in at a cost of $547.32. This whole adventure ended up being a grand, nice. Thanks to all who helped along the way!
 
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  #14  
Old 06-02-2017, 02:13 PM
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The hub actuator on one of the sides not holding pressure then, 5 minutes and a pressure/vacuum tester would have told you that. Part is around $120.
 
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