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Solved 2020 PIU Obnoxious rattle - Underbody deflector

hardware1197

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Year, Model & Trim Level
2020 Police Utility
So I've been reading a lot about various rattles but this one I chased and thought I'd post the journey....

Had an annoying rattle coming from the B Piller/Door jamb area of the passengers side.

Symptoms:
  • Constant at any speed above 50
  • more pronounced in high wind
  • unaffected by temperature
  • Rattle could almost be felt underfoot while riding in rear passenger seat
The chase:
Removed B piller trim and floor trim
Removed both front and rear door panels
Used an endoscope
Built an automotive stethoscope from rubber tube and a small funnel

The culprit:
This CRAZY underbody deflector panel that is like a felt covered plastic pan that looks like it was designed at the last minute to solve some problem that not much thought went into....slapped in place with a plastic nut and some screws......I almost think that some trim is missing that allows air to sneak into the pan area and cause it ti flop up and down and random oscillations - my temporary solution was some duct tape.....that's correct.......

By the way that pan has a LOT of little rocks and debris in it at just over 2800 miles since new.......

Part in question: 7811782 (L1MZ-7811782-F - PIU Version)

crazy_pan.jpg


I did not see any reference to this is search........
 




peterk9

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2020 Aviator Reserve
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hardware1197

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Must be

L1MZ-7811782-C​

Then.....

Here's a screen grab from an ST underbody walk around walk around video on svtperformance.com


crazy_pan2.jpg


Make a good bootlegging car......could hide about 40 pints of shine in there......

-Dave
 




hardware1197

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2020 Police Utility
Couple part numbers for this rattle issue:

W719929-S300 - Plastic retainer
W719609-S900 - Captive washer nut
 




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