Grinding at acceleration

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Max FR

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Hi everyone, weird noise when accelerating at low rpm I have something like a vibration or grinding just for a second or so , like a metallic plate vibrating but I checked and there is nothing loose. It’s located around and under the driver’s floor as I can feel lightly it in my feet. Any idea ? Could it be the TC ?
 

FordTechOne

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Possibly IWE (hub disconnects) are engaging due to low vacuum or a leak. When the noise is occurring, switch to 4WD and see if it goes away. If the noise stops, the issue is IWE related.
 
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Max FR

Max FR

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Ok tks I will try in 4x4 but it is so random and brief that I won’t have time to switch and it’s always on acceleration around 1100rpm
 

DS550

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Same issue. Drives me nuts driving thru a parking lot or leaving the house. I will check it out. Perfect description by MaxFR
 
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