Hi my L322 4.2 Supercharged 2008 MY was away at Auto Transmission Specialist having Autobox rebuilt ,it ran well when it went away other than signs on hills of Torque Convertor problems .However when Left Catalyst was removed it was found to be breaking up,possibly due to an injector problem which i had repaired 3 years ago . ,I was contacted and bought a new cat and sensors as when old cat refitted it was causing a fault code and the transmission could not be reset due to this .Some time after this a misfire /bad running had started - although im not sure when as they didnt contact me .It was then without my knowledge sent to a Land Rover Specialist ,he spent 3 days and then announced that it was the supercharger gasket at fault .At this point and 7 weeks later I insisted that i could pick up my car and get it home to repair (as i am a motor mechanic ).
I removed ,supercharger ,manifolds and injectors - examined and all ok - no failed SC Gaskets ! Rebuilt using all new gaskets ,new spark plugs and a known good used set of injectors (and it now has 4 new genuine LR O2 Sensors) - as the oil was now overfilled with petrol - something the so called specialist hadnt noticed . On rebuild ive found that it is running very rich on bank 1 and lean on bank 2 .No air leaks can be found and MAF Sensor and ECT sensor seem to be working correctly ,however the Variable Cam Timing on Bank 1 is 63 degrees and Bank 2 is 65.512 degrees.Does anyone have any ideas on this as the only thing we thought was that because the car had sat for so long and petrol in the oil the units may be sticking - or one of them is .These readings are when warm on tick over and that is when running is at its most rough ! Range Rover Overfinch Vogue SE 4.2 Supercharged.