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mattm mattm is offline
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Car: 335i
Default MHD 2+ and JB4 = 30FF? - 05-26-2019, 11:11 PM

I recently decided to try the MHD Stage 2+ on my car replacing the BMS BEF ive had for about 8 months with no issues.

Ive driven the car about 150 miles since, and twice on pulls its thrown a 30FF.
Unfortunately i was not logging during either of those pulls. After the second one i disabled the JB4 (map 0) and have been driving on only MHD for about 30 miles so far with no issues. Both times the car returned to normal operation clearing the code on the fly.

Is this a known issue? Do i have to now make a choice? The car has no mechanical issues, I smoke tested the vacuum system after the first time and found no leaks. Had no issues for the ~8 months i had the BMS BEF on the car. JB4 is in BEF mode. Was on Map 5 the first time, second time was Map 2.


2009 335i, JB4 G5, MHD 2+, AFE Stage 2 Intake, Dinan Exhaust
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Car: E92 335XI
Default 05-27-2019, 08:50 AM

Simple- use the JB4 + BEF ; )

make sure your jb4 is set in flash only mode- not just 0 if you wish to try MHD only or remove


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