Stalling on cold start

AndyW · 03-07-2022, 09:15 PM

Ever since upgrading my turbo to a PS2 last year I have experienced occasional stalls on cold start. Typically it would just stall once and then start and idle fine so I just lived with it. This AM it kept starting, lding, then stalling. But this afternoon, when I went to test it, it went back to its "one time only" behavior, but this time I logged it. Would appreciate any insight from the experts here on the linked datazap log.

https://datazap.me/u/andyw/stalling-...26-27-28-29-45

AFR, MAF, TMAP and O2 signals seem fine. Rail pressure seems to drop more than I think it should at first but that doesn't seem to be the source of the problem. It does seem WGDC and VANOS data start moving a lot right before the stall happens. But I'm not smart enough to know what that means.

Based on what I have read it could be TMAP (replaced last year), MAF (replaced last year), VANOS (never replaced), boost leak (can't detect one and logs don't indicate one from my read), O2 sensor issue (replaced last year).

Car is heavily modified (FBO, tuned, lightweight flywheel). I also have cold start coded out (but it has also exhibited the behavior with cold start enabled). I flashed xHP Sunday but since the stalling behavior it is the same behavior as before I did that, I don't think there is a correlation. I have tried flashing different MHD maps other than my custom Wedge tune andthe behavior doesn't change. I believe sometime last year I reset throttle adaptions, also with no effect.

TIA!

AndyW · 03-14-2022, 08:29 PM

Looks like it may be the eccentric shaft motor...getting valvetronic codes.

03-07-2022, 09:15 PM	#1
AndyW Supreme Galactic Commander (one galaxy over...) 672 Rep 1,778 Posts Drives: '08 E93, '12 E82, '13 E93 M3 Join Date: Feb 2012 Location: Washington, USA iTrader: (5)	Stalling on cold start Ever since upgrading my turbo to a PS2 last year I have experienced occasional stalls on cold start. Typically it would just stall once and then start and idle fine so I just lived with it. This AM it kept starting, lding, then stalling. But this afternoon, when I went to test it, it went back to its "one time only" behavior, but this time I logged it. Would appreciate any insight from the experts here on the linked datazap log. https://datazap.me/u/andyw/stalling-...26-27-28-29-45 AFR, MAF, TMAP and O2 signals seem fine. Rail pressure seems to drop more than I think it should at first but that doesn't seem to be the source of the problem. It does seem WGDC and VANOS data start moving a lot right before the stall happens. But I'm not smart enough to know what that means. Based on what I have read it could be TMAP (replaced last year), MAF (replaced last year), VANOS (never replaced), boost leak (can't detect one and logs don't indicate one from my read), O2 sensor issue (replaced last year). Car is heavily modified (FBO, tuned, lightweight flywheel). I also have cold start coded out (but it has also exhibited the behavior with cold start enabled). I flashed xHP Sunday but since the stalling behavior it is the same behavior as before I did that, I don't think there is a correlation. I have tried flashing different MHD maps other than my custom Wedge tune andthe behavior doesn't change. I believe sometime last year I reset throttle adaptions, also with no effect. TIA! __________________ Best, Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune
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03-14-2022, 08:29 PM	#2
AndyW Supreme Galactic Commander (one galaxy over...) 672 Rep 1,778 Posts Drives: '08 E93, '12 E82, '13 E93 M3 Join Date: Feb 2012 Location: Washington, USA iTrader: (5)	Looks like it may be the eccentric shaft motor...getting valvetronic codes. __________________ Best, Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune
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