m5board.comoholic (>1000 posts)
Join Date: Dec 2012
Location: New Jersey
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Pull the codes...
but 400 hp works by limiting the fill , ie throttle to 80% and 500 hp mode the throttles don't open 100% below certain rpms( not in front of the tuning computer to tell you which exactly). So it's possible you have broken/missing tooth on the actuator btw the 80%-100% open range.
oth the actuators do self test not sure the exact criteria of that though.
2001 E36/7 MRoadster
2001 E39 M5
2010 E60 M5
2008 E90 335xi
Last edited by Ferris; 17th April 2019 at 06:16 PM.