I've been fighting horribly rough and rich cold starts and idling with the new turbo setup. I assumed it was due to the Miller system, but when I plugged in my old ECU with the sssquid tuning chip, it ran exactly the same. Prior to the turbo, that tune ran flawlessly with zero issues.
I started racking my brain about what I had changed that would affect cold idle and cold start. The only thing I can think of is the spark plugs. I changed out the standard Bosch WR8LC plugs that are stock on the m30b35 for a set of NGK 5534/BPR7ES plugs, which were recommended by the 745i guys over on bf.c. But given that my motor is a high-comp m30b35 and not a low-comp m106, and that it runs m1.3 (no cold start injector) versus m1.1 (yes cold start injector) has me second-guessing my choice.
Can a spark plug that is too "cold" cause poor cold starts and idles? I have to confess I'm not 100% sure what the term "cold" refers to, I just know I here ithe term used often with regards to spark plugs in turbo applications.
I started racking my brain about what I had changed that would affect cold idle and cold start. The only thing I can think of is the spark plugs. I changed out the standard Bosch WR8LC plugs that are stock on the m30b35 for a set of NGK 5534/BPR7ES plugs, which were recommended by the 745i guys over on bf.c. But given that my motor is a high-comp m30b35 and not a low-comp m106, and that it runs m1.3 (no cold start injector) versus m1.1 (yes cold start injector) has me second-guessing my choice.
Can a spark plug that is too "cold" cause poor cold starts and idles? I have to confess I'm not 100% sure what the term "cold" refers to, I just know I here ithe term used often with regards to spark plugs in turbo applications.
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