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Solved ✔ F10 535i engine power loss 15mph, DME issue?
20-01-2024, 19:21 PM,
(This post was last modified: 28-01-2024, 16:35 PM by Clusters.)
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Update: As @maksymw sait, it was the eeprom. Thanks @maksymw for all the help in guiding me flash the eeprom you created. I had to flash just the eeprom and re-encode the DME. Everything is back to normal.
My 535i has been in limp mode for the past few months and I have not been able to figure out what's wrong. Local indy shop has no clue either and suggesting that it could be the DME. Car idles fine, compression test showed 193-203 range and smoke test doesn't show any leaks. Car drives find up to 15 mph and as soon as it shifts automatically to 3rd gear, loses power completely and start to shudder when accelerating. I tried to manually put the car in 2nd gear and same behavior above a certain speed, usually around 15 mph. There is no engine/transmission fault codes. The only code I have is for water vale and seat standardization that I am planning to take care of later. Removed the catalytic converted and tried with catless downpipe, but issue persists. Car previously had MHD state 2 + pump gas tune. We unfortunately no longer have access to the school email that was used to purchase MHD license. I've already contacted MHD, but the only option is buying a new license. Just to make sure the DME is stock, we used esys to flash the car back to stock. Indy shop is saying that the DME still has some MHD tune in eeprom or somewhere so the only option is getting a new DME. They can't find any mechanical issues with the car. I was able to complete every test in ISTA successfully. Every module in the car is responding in ISTA and we upgraded software in all available modules via ISTA without any issues. Lower pressure fuel is 50 psi and high pressure shows 80 bar. DME and EGS adaptations have been reset. I can't figure out what's wrong. I can tow it to a dealer 40 miles away but wanted to get some help here first. I am based out of Dallas, TX, USA. Does MHD tune modify DME's EEPROM or any part of the DME that can't be reset to stock via esys? I see no physical damage to the DME and the wiring looks fine. Apologize for the long post but I wanted to share as much info as possible for anyone that could help out!! Datalog links in the attachement |