Mhd gone wrong

Gucho15 · 02-12-2019, 12:44 PM

hey i need help getting my car running again, the first time I tried to install MHD, my battery tender wasn't keeping up with how much energy was being used and now the battery is dead, the flash finished but everything is wrong with my car, windshield wipers are on, abs is malfunctioning, throttle is malfunctioning, etc the car revs up to 2,000 rpm over and over. I've tried reflashing with a better battery tender but the car is in the same state and the battery is still dead.

SnapCoupe · 02-12-2019, 01:40 PM

Quote:

Originally Posted by Gucho15

hey i need help getting my car running again, the first time I tried to install MHD, my battery tender wasn't keeping up with how much energy was being used and now the battery is dead, the flash finished but everything is wrong with my car, windshield wipers are on, abs is malfunctioning, throttle is malfunctioning, etc the car revs up to 2,000 rpm over and over. I've tried reflashing with a better battery tender but the car is in the same state and the battery is still dead.

I had this happen to me once before. I had to fully remove MHD (flash to stock, not "Stage 0") and redo the long flash and it started working just fine.

dcorn · 02-12-2019, 02:34 PM

Charge the battery before doing anything else. Leave the battery tender on the car overnight and it should be fine. Once the battery is discharged, it's not going to work correctly until it's back to a certain level.

Did you turn off the headlights, HVAC and all that stuff it says to before flashing? A tender should be able to keep up with the discharge from the tune. I just MHD flashed my car a couple weeks ago with a decade old battery tender, worked fine.

Gucho15 · 02-12-2019, 03:15 PM

I did turn off everything, but my angel eyes are always on, and when I started the flash my taillights were on

rsyed07 · 02-12-2019, 03:24 PM

Get a 2nd car from a buddy or family member. Let it idle while you have jumper cables attached to your car. Then restart your flash. You'll burn a gal of gas at most but with the ease of knowing the flash will be successful.

02-12-2019, 12:44 PM	#1
Gucho15 Registered 0 Rep 4 Posts Drives: 2010 e90 335i Join Date: Feb 2019 Location: bay area, california iTrader: (0)	Mhd gone wrong hey i need help getting my car running again, the first time I tried to install MHD, my battery tender wasn't keeping up with how much energy was being used and now the battery is dead, the flash finished but everything is wrong with my car, windshield wipers are on, abs is malfunctioning, throttle is malfunctioning, etc the car revs up to 2,000 rpm over and over. I've tried reflashing with a better battery tender but the car is in the same state and the battery is still dead.
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02-12-2019, 02:34 PM	#3
dcorn Captain 77 Rep 940 Posts Drives: 2008 E90 335i Join Date: Dec 2009 Location: NoVA iTrader: (2)	Charge the battery before doing anything else. Leave the battery tender on the car overnight and it should be fine. Once the battery is discharged, it's not going to work correctly until it's back to a certain level. Did you turn off the headlights, HVAC and all that stuff it says to before flashing? A tender should be able to keep up with the discharge from the tune. I just MHD flashed my car a couple weeks ago with a decade old battery tender, worked fine.
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02-12-2019, 03:15 PM	#4
Gucho15 Registered 0 Rep 4 Posts Drives: 2010 e90 335i Join Date: Feb 2019 Location: bay area, california iTrader: (0)	I did turn off everything, but my angel eyes are always on, and when I started the flash my taillights were on
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02-12-2019, 03:24 PM	#5
rsyed07 Captain 175 Rep 595 Posts Drives: E46 330i, E92 13' 335is Join Date: Jun 2016 Location: Central FL iTrader: (0)	Get a 2nd car from a buddy or family member. Let it idle while you have jumper cables attached to your car. Then restart your flash. You'll burn a gal of gas at most but with the ease of knowing the flash will be successful.
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