[F30Beast335i]

Recently uninstalled my JB4 and as soon as I did I have been getting these codes and car shutting down on me after mild/heavy throttle. I have encountered this with out tune and I recently switched to bm3 and starting to see it more often now . I do have stage 2 fuel pump and FBO. Here is a log or two and the codes I keep getting. . Wondering if HPFP is the failure of if I have a faulty LPFP . Even possibly my EKMp2 could be faulty as well. Any help would be greatly appreciated.



http://www.bootmod3.net/log?id=5b456b80d10b437911b1cbef

Here is 3 pull back to back. I thing happened here but under normal spirited driving caught a fault in next lug and car shut down. Throws fuel supply code and car shut off and you better hope you have somewhere to pull over cause if not you stuck in the middle of the road

This one happens near end of log where I encounter it .

http://www.bootmod3.net/log?id=5b456c1fd10b437911b1cbf0

[JaredG_F30]

I've never run JB4 but I've read a bunch of posts about JB4 frying peoples MAF sensor (or is it MAP sensor) and getting all kinds of fueling related codes after pulling JB4 off.

[F30Beast335i]

Originally Posted by JaredG_F30

I've never run JB4 but I've read a bunch of posts about JB4 frying peoples MAF sensor (or is it MAP sensor) and getting all kinds of fueling related codes after pulling JB4 off.

Yeah I do have a MAF sensor code I ordered a new MAF we will see if that fixes it ?

[HKD126]

Stupid question, but did you disconnect your battery when you uninstalled the JB4?

[F30Beast335i]

Originally Posted by HKD126

Stupid question, but did you disconnect your battery when you uninstalled the JB4?

Yeah I sure did . But I had a MAF sensor before I removed it but I always thought it was bc of aftermarket intake so I never looked into it and never had any problems until JB4 was removed .

[HKD126]

Do you have an BMS Intake? Mine through codes left and right and made my car run poorly on a JB4 and BM3 (separately). I finally ditched it and went with a AFE drop in filter. Night and day better performance.

[F30Beast335i]

Originally Posted by HKD126

Do you have an BMS Intake?

No AFE

[zinner]

I have had LPFP limp modes before on extended pulls at high speeds. Dinan makes a 250 dollar kit to retro fit to the LPFP to add more capacity to the system.

https://www.dinancars.com/product/r4...ies=&mid=335i/

[F30Beast335i]

Originally Posted by zinner

I have had LPFP limp modes before on extended pulls at high speeds. Dinan makes a 250 dollar kit to retro fit to the LPFP to add more capacity to the system.

https://www.dinancars.com/product/r4...ies=&mid=335i/

I've already upgraded LPFP to a walbro 450 pump aka stage 2 . I have a back up replacement pump that I may swap in a couple of days want to wait and see if MAF sensor will fix issue first . I have upgraded lines as well.