SOLVED pls help: Mixture control faults

johnnyd40

New Member
Jun 21, 2022
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So i've been trying to track down exactly why my 335 has been setting lean mixture faults, mostly on bank 1 but sometimes will see bank 2 pop up as well
Car is an 08' N54 w/130k miles, mods are as follows, chargepipe, downpipe, relocated inlets, 3.5tmap, fuel-it stage 2 pump, VRSF intercooler, MHD stg2+ tune. Within the last 6 months the car has gotten new HPFP & low pressure sensor, EKPS, and I installed a new FPR/siphon jet when the fuel-it pump was installed. Also had an index 11 injector that was slowly leaking down so i replaced them all with index 12s (they were used)
So far I have smoke tested the intake tract, crank case, and exhaust with no signs of an air leak. I filled up with Shell 93 and put in a bottle of techron for good measure, cleared adaptations and approx 75 miles later it set bank 1 lean mixture fault again. I've switched to a different version of the MHD software and no difference. Car runs well. Im leaning towards oxygen sensors giving bad info, but cant be sure. I've graphed a log and will post it (not even sure I did that correctly)
Any insight would be greatly appreciated, sorry for the novel.
 

johnnyd40

New Member
Jun 21, 2022
9
2
0
 

johnnyd40

New Member
Jun 21, 2022
9
2
0
For anyone who is having the same issue and having trouble- the (used) index 12 injectors I had installed were tired, I swapped out bank 1 injectors for some of my index 11s, adapted them and cleared faults, hundreds of miles later and bank1 mixture faults are gone. I will be sending the 12s out to injector-rehab to have them cleaned and tested.