Half engine light but no codes?

dlr944 · 03-26-2015, 11:42 PM

Hello,

I have recently added sport exhaust to my jb4 e92 map5 setup. However, I am now getting the half engine light when going from 3rd to 4th gear but jb4 with laptop or handheld obii reader shows no codes?

How do I diagnose the the problem if jb4 laptop interface or handheld shows no codes?

Thanks

335NJ · 03-27-2015, 12:17 AM

Get a datalog of the run, and when the half engine light comes on be sure to note the rpm it happened at. For arguments sake you can disable auto-clear if you haven't already. Speedo 1 tach 4 to disable, speedo 1 tach 3 to enable.

Then upload the .csv to N54Tech in the support section so they can review the log and see what's going on. You can also upload the log to Datazap.me and post that here so we can have a look.

03-26-2015, 11:42 PM	#1
dlr944 Enlisted Member 4 Rep 49 Posts Drives: 335i Coupe Join Date: Aug 2010 Location: Austin iTrader: (0)	Half engine light but no codes? Hello, I have recently added sport exhaust to my jb4 e92 map5 setup. However, I am now getting the half engine light when going from 3rd to 4th gear but jb4 with laptop or handheld obii reader shows no codes? How do I diagnose the the problem if jb4 laptop interface or handheld shows no codes? Thanks
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03-27-2015, 12:17 AM	#2
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	Get a datalog of the run, and when the half engine light comes on be sure to note the rpm it happened at. For arguments sake you can disable auto-clear if you haven't already. Speedo 1 tach 4 to disable, speedo 1 tach 3 to enable. Then upload the .csv to N54Tech in the support section so they can review the log and see what's going on. You can also upload the log to Datazap.me and post that here so we can have a look.
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