Hello, everyone! I have a 2006 Mini Cooper S Convertible that was getting awful mileage, around 20mpg. I got some upgrade Bosch 550cc injectors and installed them. The car is now getting 42mpg with this change and runs fine, but my service engine light keeps coming on with a P0172 code, which indicates the air fuel mixture needs to be adjusted, or tuned. I have an Autel MaxiCOM MK808BT, but it tells me that the injector function isn't available for this car. Does anyone know what system I need to do a tune on the injectors to stop this code? I am familiar with how to do this, but do not know what system will gain me access to this part of the ECU. I appreciate any advice. Thanks in advance.

 

Wow 42 mgp I'm getting around 27 mgp w/my 04 MCS and from what I 've read is about normal. I'm running with the JCW Bosch 380cc injectors. The stock injectors are 330cc so going to 550cc is a substantial change and will require a re-tune to remap the fuel tables.

 

Yes Sir, it does require a re-tune of the fuel tables. I am looking for a way to access those so I can do so. But I might just take it in to the dealer and let them do it since it is difficult to find out what equipment I need to do it myself. The stock on my car was the 380cc injectors. I knew they were either going bad or clogged so I chose the upgrade. The mileage jump was amazing, but I started getting that pesky check engine light right afterwards.

 

Touch base with "adriancl" on this forum for a remote tune. Very knowledgeable and very reasonable and has tuned many members' Minis.

 

DME tuning options for the R53 are pretty slim. The only sort of self-contained tool I know of is the one from Bytetronik. There are a few shops around the country that do tunes, and then adriancl seems to have figured out most of the tables himself so he can tune using - I think - MPPS.

I doubt that a dealer will be able to fix your fueling with 550 cc injectors, but I don't know for sure.

Did you actually calculate your mileage, or did you just look at the OBC? 42 mpg with no tune on 550 cc injectors sounds really fishy.

 

Thanks, deepgrey! I have calculated the mpg manually and compared to the car's readout as well. Both are the same. My engine is R52, is that the same boat as R53 you mentioned?

 

Thanks, cooper48! I will look adriancl up.

 

Interesting. Yes, the R53 is just the designation for the hardtop Cooper S.

 

deepgrey, Thank you for the input, I did not know the difference between the two engines/designations. I sent adriancl a private message, hopefully he would know an answer.

 

Let us know how it goes!