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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 > MHD backend flash help



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      06-19-2019, 06:26 AM   #1
Mpriftiz4
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MHD backend flash help

Recently decided to do a MHD backend flash to my N54tuning z4 running JB4. I inadvertently flashed the regular tune by following instructions in beginning of manual rather than the specific JB4 backend flash. Car wouldn’t turnover so I reflashed it back to zero and same issue. What now???? Please help thank you.
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      06-19-2019, 07:14 AM   #2
type-dRew
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Try flashing to a jb4 map like you meant to the first time?

Its also my understanding the jb4 has to be completely uninstalled to flash correctly, was it?
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      06-19-2019, 07:18 AM   #3
Mpriftiz4
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Quote:
Originally Posted by type-dRew View Post
Try flashing to a jb4 map like you meant to the first time?

Its also my understanding the jb4 has to be completely uninstalled to flash correctly, was it?
No, that was a problem. I hope I didn't ruin the JB4. I left the charger on overnight and started this morning, but it was revving up and down since it's still on a JB4 map. I changed the map to zero and it started fine, back to stock settings. I will try to reflash MHD tonight while keeping JB4 on map zero this time. Fingers crossed.
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      06-19-2019, 08:21 AM   #4
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Can someone explain to me exactly what step 12 is referring to by stating select 4/2 to enable backend flash capability??
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      06-19-2019, 11:57 PM   #5
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Quote:
Originally Posted by Mpriftiz4 View Post
Can someone explain to me exactly what step 12 is referring to by stating select 4/2 to enable backend flash capability??
*Enter JB4 menu
*Set speedometer to 4 (40) then set tach to 2 (2000)
*Exit JB4 menu
*Follow instructions for MHD BEF
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