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      02-09-2013, 11:19 PM   #1
LAZ's Avatar

Drives: 08' 135i Coupe
Join Date: Dec 2012
Location: San Antonio, TX

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JB4 -Misfire with Map 2 only?

1- I have been running JB4 for a couple of months now. I have been running Map 1 with DCI and 93 octane...The car runs great under map 1. I recently installed BMS downpipes. However, when I switch to Map 2 I often get a misfire code for Cylinder 2. I have done pull after pull to see if the JB4 simply has to "learn" but after many pulls the problem remains. Map 2 runs ok when I WOT from a higher speed (60 roll) but misfires when I WOT at lower speeds/gears (20-30mph). Can running this extra 1.5 psi cause the car to go from having ZERO misfires on map1 to misfires almost EVERY time with map 2? Or do you think there is another culprit causing this issue?


2- Based on your experience...I have an Automatic car's oil temp easily hits 250 degrees but doesnt really go past that after some spirited driving. A day after installing my BMS downpipes I noticed that my car seemed to be hesitant to shift from 3rd to 4th at WOT...its almost seems like it stalls before the shift...and on occastion the exhaust would sound like its makes a fart noise between shifts, as if its having a hard time breathing. I have no experience with aftermarket downpipes. Does this seem normal? Do you think the 250 degrees can cause the transmission to not preform to its full potential?

Any help from those with Jb4/DP experience would be greatly appreciated.
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      02-10-2013, 12:41 AM   #2

Drives: 135i Cab
Join Date: Jul 2012
Location: Phoenix, AZ

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What JB4 version and what software revs are you running? What are your settings?

Post a log and an image of your user adjustable settings. Have you run map 5 and do you get the same results.

It sounds like you are referring to what to me sounds like retarded timing during a shift...sort of like a NLS (No Lift Shift), for me this was very noticeable when I was running restricted boost levels in 1st and 2nd. Pretty sure it was also the case in map 2 and know it was it map 6 but at the time I didn't put it together and haven't revisited it as map 2 ran like crap for me at the time and there is no reason for me to run it. I'll probably dial map 6 in later but for 5.
2008 E88--Fuel-It! Stage 4 LPFP & PI--PS2 turbos--JB4/MHD--FBO--662whp/604wtq
2011 E90--Fuel-It! S2BL LPFP and PI--PS2 Turbo--JB4/MHD--FBO--546whp/589wtq
2013 Mini JCW--Tune--DP--FMIC--a couple Fuel-It! goodies--265whp/320wtq
2013 F10--JB4/BM3
2015 F82--Fuel-It! Stage 3 LPFP & PI--PS2 Turbos-- JB4/BM3-FBO
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      02-10-2013, 01:29 PM   #3
2018 440M-Sport MPPSK/THP
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Drives: 2018 440M-Sport MPPSK/THP
Join Date: Jun 2011
Location: Raleigh, NC

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If you have over 25K on your plugs they could be the problem. Yes a pound & a half can be enough to cause a misfire if your car was already near the edge.

I run a custom map 6 & ramped up 1/2 pound at a time with Terry reviewing the logs. Got to bad logs then backed down 1/2 pound.

2018 440M-Sport MPPSK/THP - 2017 CX-5 - 2016 Genesis R-Spec Coupe 6MT - 2013 135is Cab 6MT/JB4 - 2009 V-Star - 2009 Expedition 4X4 - 1998 Ranger 4X4 5MT - 1965 Cobra MK-IV 5MT BUILD LOG
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downpipe, jb4, map 2, misfire, misfiring

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