Hello everyone,

Hoping someone has an idea where to start with this. So I was getting low boost codes recently and decided To change my turbo on my countryman from the standard s turbo on the n18 to the JCW turbo. I finished the job yesterday and took it for a test drive, It was driving great and built 10psi but after about 10 minutes I got the same low boost (2C57) and wastegate (2CB3) codes. Today I decided to try adjusting the wastegate and took it for a test drive. It drove great again but after 10 minutes I got a huge misfire on cyl 4 and 3. Limped home then Tried swapping the plugs and coils around and the misfire Is persistently on cyl 4 & 3. Set wastegate back and problems persist. (Codes are 2EFE,2F02,2EE0,2EED,2FAB,2F01,2EE2,2EEC,2EF0)

maybe it’s a sensor?

Im stumped here, any help is greatly appreciated!

 

Ever find out what it was? Injector(s)? Run any cleaner through it?

https://www.northamericanmotoring.co...injectors.html

 

Actually figured it out yesterday so your timing is immaculate. It was a bad DME unit. Found a numbers matching unit from a Countryman being parted out and had the data from my DME cloned onto it. Runs a million times better and fired right up first try. The way I traced it back to the DME was checking continuity while the engine was running on each of the coil wires. I had no continuity on cyl 4 which was the source of the misfire. The guy I had clone my DME said that a faulty unit will usually present its self in the coils or injectors being shut off and that causing the misfire.

https://aetoronto.ca/ is who cloned my unit for me. Highly recommend Tony to anyone in the GTA who needs a cloning or diagnostic work. Super knowledgeable guy.

 

Wow! So your #4 was the only one misfiring? What would "numbers matching" be?

 

The misfire was strongest on cyl 4 with the occasional misfire on cyl 1 and 3. Numbers matching meaning the bmw & Bosch numbers. My bmw # was 7648190 for example. It’s a little tricky to find a used unit but it’s a couple hundred vs a couple thousand buying a new unit.

 

Where is this number? Is it a series number on the unit? Like a rev/version number?

 

it’s on the backplate of the dme, they typically start with a 7 or 8 for this generation. The Bosch unit numbers are printed a little smaller above towards the top of the labeling