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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Anyone figure out the high pitch whistle sound when shutoff?
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<blockquote data-quote="JP77" data-source="post: 1416651" data-attributes="member: 33150"><p>Just a thought. It’s easy to diagnose/recreate with a simple vacuum hand pump. The IWEs won’t grind until there is a complete failure and they go left unchecked. When your truck isn’t running the IWEs are engaged. Start it up the vacuum disengages the IWEs (2x4). Then depletes the air in the larger vacuum reservoir. When you turn the truck off the vacuum releases and the IWEs engage (like when you shift to 4x4) the reservoir will continue to move back to ambient pressure.</p></blockquote><p></p>
[QUOTE="JP77, post: 1416651, member: 33150"] Just a thought. It’s easy to diagnose/recreate with a simple vacuum hand pump. The IWEs won’t grind until there is a complete failure and they go left unchecked. When your truck isn’t running the IWEs are engaged. Start it up the vacuum disengages the IWEs (2x4). Then depletes the air in the larger vacuum reservoir. When you turn the truck off the vacuum releases and the IWEs engage (like when you shift to 4x4) the reservoir will continue to move back to ambient pressure. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford F-150 Raptor General Discussions [GEN 2]
Anyone figure out the high pitch whistle sound when shutoff?
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