Cabin noise when driver door opens - Solved.

TechnicalDisaster

May 23, 2022

So I noticed a strange high pitched whine from the cabin that last 2-3 seconds when I open the driver side door. I did a search here and on the Bronco6G forums and I didn’t find any results.

I’m curious what this could be. Only happens once when the vehicle is first opened, and only happens on the driver side. Sounds like a pump is priming or something that is getting engaged right after the door opens.

2022 Bronco Badlands with Lux & Sas.

Is this normal?

EDIT: Solved by @BadlandsA51. It is the low pressure fuel pump priming.

the poacher

Sort by date

Reaction Score

May 23, 2022

Maybe the speaker? Try recreating it with the radio on and then off and see if it goes away when the radio is off

Member # 5650 / 2022 Bronco Sport Badlands

TechnicalDisaster

May 23, 2022

I had an F150 that did something similar, it turned out to be the door seal expanding/inflating after being compressed when the door was closed.

22 BB 4dr SAS 2.7 Mid Pkg Hot Pepper Red, Delivered 8/25
Previous 2019 F150 Ruby Red SCrew 3.5 Eco, XLT Sport/FX4 302A

May 23, 2022

It is the electric fuel pump priming the high pressure direct injection pump for a quicker start. All Eco Boost engines do it.

BWepps, Smoothmove

May 23, 2022

BadlandsA51
It is the electric fuel pump priming the high pressure direct injection pump for a quicker start. All Eco Boost engines do it.

This might be it. I tried opening the door with the hood open, and the sound is definitely coming from the engine bay. This is my first Eco boost engine and I wasn’t aware of how they sound. Is the pump getting primed with gasoline, or is it getting primed by compressing air?

May 23, 2022

It's priming with gasoline from the low pressure fuel pump so that the high pressure pump is completely full of fuel and can generate the 300 to 500 PSI of pressure needed to start the engine. The high pressure pump delivers very little volume, it would take it a long time to self-prime if engine had been off for a while, so the electric pump primes it a first driver interaction with the vehicle, which is opening the door.

Deano Bronc, TechnicalDisaster

May 23, 2022

frdfan
I had an F150 that did something similar, it turned out to be the door seal expanding/inflating after being compressed when the door was closed.

This is absolutely a mechanical noise. I think @BadlandsA51 is on the right track.

Deano Bronc, frdfan

May 23, 2022

BadlandsA51
It's priming with gasoline from the low pressure fuel pump so that the high pressure pump is completely full of fuel and can generate the 300 to 500 PSI of pressure needed to start the engine. The high pressure pump delivers very little volume, it would take it a long time to self-prime if engine had been off for a while, so the electric pump primes it a first driver interaction with the vehicle, which is opening the door.

Thank you for the explanation!

May 23, 2022

You are welcome. I am fairly new to Bronco Nation, I will try to watch the forums for cases like this where I can be of help. I'm still a ways out on getting our Badlands.

TechnicalDisaster, Deano Bronc

May 23, 2022

Ha ha I read this post as Drivers door wine. Brought me back to my uncle’s 68 T-bird that he rigged up a windshield washer motor and a clean reservoir with Jack Daniels and a little spigot on the dash. Ahhhh the 80’s
He also had a tailgater eliminator and some other James Bond stuff.

Bronco Nation 1100. Everglades, Desert Sand
Res: 7/30/20 ordered 1/22/21 reorder 10/15/21 changed to Everglades 3/9/22 schedule 8/29/22 bumped to 9/5; 9/7/22 blend, 9/9 Mods, 9/26/22 completed, 10/7 shipped, 11/3/22 delivery

Deano Bronc, 14U

May 23, 2022

#10

Jakob1972
Ha ha I read this post as Drivers door wine. Brought me back to my uncle’s 68 T-bird that he rigged up a windshield washer motor and a clean reservoir with Jack Daniels and a little spigot on the dash. Ahhhh the 80’s
He also had a tailgater eliminator and some other James Bond stuff.

Ha! I updated the title to be more specific now that we got it figured out.

Jakob1972

May 30, 2022

#11

Yes my Basesquatch does it too, thank for finding the answer.

2022 Bronco 2dr Basesquatch 2.7
Carbonized Grey Mod Bumper Rock rails Brush guard Hitch Pod lights Black bead locks KMA-367

You must log in or register to post here.