MHD Flash problems, need help

tracktime54 · 07-29-2018, 06:39 AM

Hi guys
I've had a go running the MHD flash tune (stage 1 map) and it failed early in the process. Now the car won't start.. the starter cranks but it wont start
Now of course I can't try to flash again but the ignition is not and hence cant run the flash
Not really sure what to do from here. The battery is on a charger now as maybe it was too low for the flash. I did have the charger connected at the time
Keen on any help to get the car running again!
Thanks

E85 335 · 07-29-2018, 06:44 AM

that is your problem. Need battery charger on at all times when flashing. Especially the the first time you flash cause the waterpump runs and flattens your battery real quick.

tracktime54 · 07-29-2018, 06:58 AM

OK yes i charged the battery to full and have the charger still on and am now running the stock map flash. i was stupid and thought the engine had to be running when it said ignition needs to be on! ive pulled the lpfp fuse but didnt know about the water pump. for some reason the headlights are on while the flash is running now even though they are switched off...

E85 335 · 07-29-2018, 03:44 PM

Quote:

Originally Posted by tracktime54

OK yes i charged the battery to full and have the charger still on and am now running the stock map flash. i was stupid and thought the engine had to be running when it said ignition needs to be on! ive pulled the lpfp fuse but didnt know about the water pump. for some reason the headlights are on while the flash is running now even though they are switched off...

got to turn off your running lights in the in-dash settings

vtl · 07-29-2018, 05:34 PM

The fuel pump doesn't run anymore with MHD during flashes, so the requirement for a charger is lessened. The water pump doesn't run at all, and never has during flashes. You just need to flash with ignition on not engine on and you'll be fine. The flash takes over the canbus, so thats why the light switch doesnt work.

tracktime54 · 07-29-2018, 05:40 PM

thanks guys for chiming in. i got it flashed back to stock and now it starts fine. now that im familiar with the procedure ill have another go soon at getting to stage 1

07-29-2018, 06:39 AM	#1
tracktime54 New Member 2 Rep 14 Posts Drives: E92 335i 6MT Join Date: Jun 2018 Location: Adelaide, Australia iTrader: (0)	MHD Flash problems, need help Hi guys I've had a go running the MHD flash tune (stage 1 map) and it failed early in the process. Now the car won't start.. the starter cranks but it wont start Now of course I can't try to flash again but the ignition is not and hence cant run the flash Not really sure what to do from here. The battery is on a charger now as maybe it was too low for the flash. I did have the charger connected at the time Keen on any help to get the car running again! Thanks
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07-29-2018, 06:44 AM	#2
E85 335 First Lieutenant 55 Rep 331 Posts Drives: BMW 2006 E92 335i Coupe Join Date: Dec 2015 Location: Gold Coast iTrader: (0)	that is your problem. Need battery charger on at all times when flashing. Especially the the first time you flash cause the waterpump runs and flattens your battery real quick. __________________ Aussie e92 335i. Pure Stage 2 Twin Turbos, Pure Performance Motorsport's Forge Conrods and Pistons, Fuel-it Port Injection, 7.5" Step-Up intercooler, Fuel-it Stage 3 LPFP upgraded fuel lines, Tial 50mm BOV, TFT RHD Inlets, MHD Custom Wedge E70 Map, Split Second PI controller, BMS OCC, PRP Coil Kit, AR Design 3" Catless DP, Remus Dual 2.5" system with 84mm quad tips, RB PCV valve, CSF Radiator
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07-29-2018, 06:58 AM	#3
tracktime54 New Member 2 Rep 14 Posts Drives: E92 335i 6MT Join Date: Jun 2018 Location: Adelaide, Australia iTrader: (0)	OK yes i charged the battery to full and have the charger still on and am now running the stock map flash. i was stupid and thought the engine had to be running when it said ignition needs to be on! ive pulled the lpfp fuse but didnt know about the water pump. for some reason the headlights are on while the flash is running now even though they are switched off...
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07-29-2018, 05:34 PM	#5
vtl Brigadier General 1493 Rep 3,148 Posts Drives: 2008 BMW 135i MT Join Date: Apr 2015 Location: Melbourne, Australia iTrader: (0)	The fuel pump doesn't run anymore with MHD during flashes, so the requirement for a charger is lessened. The water pump doesn't run at all, and never has during flashes. You just need to flash with ignition on not engine on and you'll be fine. The flash takes over the canbus, so thats why the light switch doesnt work. __________________ Build Thread
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07-29-2018, 05:40 PM	#6
tracktime54 New Member 2 Rep 14 Posts Drives: E92 335i 6MT Join Date: Jun 2018 Location: Adelaide, Australia iTrader: (0)	thanks guys for chiming in. i got it flashed back to stock and now it starts fine. now that im familiar with the procedure ill have another go soon at getting to stage 1
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