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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Help! Car is buzzing loudly during Cobb AP install!



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      12-28-2012, 09:28 PM   #1
nukezero
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Help! Car is buzzing loudly during Cobb AP install!

As of right now the Cobb is being loaded into my car at 15%. There is a huge buzzing noise in the back of my trunk. What the hell is that?

Also got a DSC malfunction error immediately. Also, hope my battery don't drain. The daylight savings feature , I left on. So the front parking light and rear parking light are on. Radio and interior lights are all off.

Shit, I hope I didn't fuck up my car.
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      12-28-2012, 10:14 PM   #2
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Buzzing noise in the trunk might be the amp, or could be the battery area. It shouldn't be very loud though.
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      12-28-2012, 10:18 PM   #3
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Quote:
Originally Posted by nukezero View Post
As of right now the Cobb is being loaded into my car at 15%. There is a huge buzzing noise in the back of my trunk. What the hell is that?

Also got a DSC malfunction error immediately. Also, hope my battery don't drain. The daylight savings feature , I left on. So the front parking light and rear parking light are on. Radio and interior lights are all off.

Shit, I hope I didn't fuck up my car.
Normal. Read the instruction manual
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      12-28-2012, 10:32 PM   #4
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Holy shit, talk about thrust!!! My car just turned into a 345i.

Thanks buddies
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      12-29-2012, 05:44 PM   #5
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Quote:
Originally Posted by nukezero View Post
Holy shit, talk about thrust!!! My car just turned into a 345i.

Thanks buddies
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      12-29-2012, 07:57 PM   #6
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Quote:
Originally Posted by nukezero View Post
Holy shit, talk about thrust!!! My car just turned into a 345i.

Thanks buddies
more like a 350i

But yeah, the noise you were hearing is the fuel pump running while the DME was programming. Totally normal. In the future, I'd recommend turning off the daytime running lights (or connecting a battery charger) before flashing the DME. It's best to keep the system voltage in the 14's if you can.
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      12-31-2012, 11:23 PM   #7
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Quote:
Originally Posted by BMWM.D. View Post
more like a 350i

But yeah, the noise you were hearing is the fuel pump running while the DME was programming. Totally normal. In the future, I'd recommend turning off the daytime running lights (or connecting a battery charger) before flashing the DME. It's best to keep the system voltage in the 14's if you can.
why does the fuel pump need to run when the car is programming? does the DME feed on fuel???
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      01-01-2013, 05:44 AM   #8
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Quote:
Originally Posted by nukezero
Quote:
Originally Posted by BMWM.D. View Post
more like a 350i

But yeah, the noise you were hearing is the fuel pump running while the DME was programming. Totally normal. In the future, I'd recommend turning off the daytime running lights (or connecting a battery charger) before flashing the DME. It's best to keep the system voltage in the 14's if you can.
why does the fuel pump need to run when the car is programming? does the DME feed on fuel???
Don't ask questions, just flash
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      01-01-2013, 06:31 AM   #9
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Quote:
Originally Posted by nukezero View Post
why does the fuel pump need to run when the car is programming? does the DME feed on fuel???
It's probably because they don't know how to safely keep it shut down during flashing. I hate this too, because it eats up battery. But it's a minor complaint.
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      01-01-2013, 01:50 PM   #10
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Originally Posted by Fully_Bolted View Post
Don't ask questions, just flash
Lmfao
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      01-03-2013, 10:11 AM   #11
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Quote:
Originally Posted by nukezero View Post
why does the fuel pump need to run when the car is programming? does the DME feed on fuel???
Good one.

It's probably because the DME is what tells the EKPS (fuel pump control module) what to do, and communication is lost during programming. By default, I'm guessing the EKPS activates the pump at a high PWM duty-cycle, which is why you hear it whining.
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