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Discussion Starter · #1 · (Edited)
2012 Speed3 109k
Mods:
Cobb cold air intake
50/50 valve
NGK Ruthenium Spark plugs

Replaced coils and plugs back to stock, battery, and MAF sensor. Idling at 500rpms with random low spikes. Shuttering when accelerating, then clears slightly over 2500-3000 rpms.

At this point I'm completely lost. Any ideas? Really want to save my car if possible.
 

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What have you done to troubleshoot the misfire and lean condition? Have you assessed fuel delivery to that cylinder? No other OBD-II codes set or pending?
 

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Discussion Starter · #3 ·
What have you done to troubleshoot the misfire and lean condition? Have you assessed fuel delivery to that cylinder? No other OBD-II codes set or pending?
All plugs and coils were replaced, lean code is gone after I changed the MAF sensor. Going to do a compression test today. If that goes well we’re going to replace the all of injectors. Ran misfire test yesterday and only saw 300 on cyl. 4.
 
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