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E30Lord E30Lord is offline
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Car: 2009 bmw 335i xdrive
Default Help. Bad misfires. Car almost undriveable - 06-20-2022, 05:23 PM

Recently I installed port injection on my 335i. Took the car out for some testing and it ran extremely well. Everything checked out. But of course that didn't last long. The following day during a cruise I began experiencing random misfires. Just random jerks every few minutes but no CEL. Took the car home and got it back out today to see if the problem was still there. It was. Although this time it was much worse. The car was almost undriveable. Misfiring every 3 seconds and car was jerking like crazy. CEL would pop up for a second and then disappear before I could scan. Took it back home immediately. I managed to get a log of during the event. Any feedback would be appreciated. AFRs seem really high.

JB4
MHD BEF
Dwnpipes
Intercooler
Stage 3 LPFP
Port Injection
Index 12 injectors
New ngk 2 step colder plugs
New elder coilpacks
New VANOS solenoids
New crankshaft position sensor
Attached Files
File Type: csv Misfire.csv (54.1 KB, 25 views)

Last edited by E30Lord; 06-21-2022 at 12:31 PM..
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E30Lord E30Lord is offline
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Car: 2009 bmw 335i xdrive
Default 06-21-2022, 04:03 AM

A 2nd to 3rd log I had from the day before I started having issues
Attached Files
File Type: csv map 5 anti lag pull.csv (32.8 KB, 20 views)

Last edited by E30Lord; 06-21-2022 at 05:45 AM..
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Cannon @ BMS Cannon @ BMS is offline
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Default 06-21-2022, 01:38 PM

Try making these changes and then upload a 3rd gear log at WOT on a private track.
1) Set all Fuel Bias to 0
2) Set Signal Scaling to 99
3) Unselect 0, 1, 2, 4, 5 in the WMI Settings


Burger Motorsports
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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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E30Lord E30Lord is offline
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Default 06-21-2022, 03:11 PM

Okay. I will try. Although the car will barely make it out of my driveway and down the road with how much it’s misfiring. Not sure I can even get a 3rd gear WOT log. It’s worth mentioning I have the motiv flex fuel module and was trying to get it setup with an mhd bef but couldn’t find any compatible flex fuel flashes for my car with IJE0S. Therefore it’s currently on the regular mhd e85 BEF. Could this be my issue? I just find it weird how it was running fine a few days ago
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Cannon @ BMS Cannon @ BMS is offline
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Default 06-23-2022, 02:28 PM

Yes that can 100% be your issue.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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