This sounds just like my issue with the plastic IAT sensor and the curve they were using. They never could figure out why it was doing that, and only would when it was below like 45*F. The updated calibration with the brass sensor fixed it for me, but I eventually went with an aftermarket tune since my car was past their drivetrain warranty period. No idea WHY they're still shipping with that old sensor.Hi guys
Are these cars known to sometimes struggle starting in freezing cold days? 2017 S550 with Eforce 2300 blower and open CAI.
It’s our 1st day of Winter here. Outside temp on sync touch screen showed 5* C/41* F and car would struggle to start but eventually did after few cranks/seconds on crank (fast cranks not slow like a dead battery) car is pump gas not e85.
What’s weird is first time it didn’t start the dash IAT showed like -54*C/-65*F but once it eventually started my dash IAT and Oil temp showed as just “-“