well since i installed DSMLink(9 months) my CEL has come on a handful of times for a split second. It only happens at very low rpm's.
First, it happened like three times while driving in 5th gear at like 2200rpms(different days, like weeks inbetween). This was right after i was sitting at a light for a few minutes. I just shifted through all 5 gears, never going passed 3k. Once i got to 5th, the CEL came on for a split second @ very light throttle.

Then, it happened twice while in first gear. Again, for a split second right after sitting at the light for a few minutes. Thing is, i checked DSMLink and coolant temps were never above like 210. I also noticed that DSMLink recorded a few degress of knock when the CEL would come on(im guessing thats when the CEL came on). It was less than 1 degree, and it was at the same low rpm's, which were 2k-3k @ light throttle. So i decided to make my stock boost guage a knock guage.

Anyway, its been a few weeks since that happened...but today something different happened. I was at the light for a few minutes. I started to pull away at light throttle in first...CEL came on, but stayed on until i let off the gas. Shifted at 3k,(in 2nd now), as soon as i hit the throttle, CEL came on again, and stayed on till i hit 3k and shifted. Now in third, i was giving partial throttle, CEL came on again, but this time my stock boost guage went up, meaning knock. I was at about 2500rpms. I never pushed the pedal more than say, i dunno, 40% pressure...and the more i pressed it, the higher the knock guage went. I immedietly let off and shited to 4th.

That was it, never happened again. Everything seems fine. Unfortunetly i wasnt logging at the time, but does anyone have any idea wtf it is? and should i be worried? Thanks.

______________________________________________________
2003.5 M3
99 M3
99 GST