Hi Blair,

I haven't got a great amount of experience on Range Rovers, but your injection durations are not a million miles out possibly still indicating a adaption issue, AMM problems in my experience usually tend to give lean readings can you scope it? Normally you are looking for peak voltage around 4 to 4.5volts range. Also look carefully for any exhaust leaks up-stream of the lambda sensors, faulty injectors or maybe even a faulty ECU I have come across on other vehicles with this type of problem. Can you look at plug condition to maybe indicate a rogue over fuelling injector?