Hi to ALL

I am having some problems with an X-type V6 Petrol year 2005. The car came with expansion tank crack and loss of coolant. client complaints engine overheating. the car arrive on recovery. i changed the expansion with new genuine one and after some diagnostics i also discover the thermostat is faulty so I renew with new genuine part. I allow the engine to idle for 30 minutes approx... with no coolant leaks and fans operating well, so coolant prob is solve. While road testing I diagnose a loss of power. back to garage i perform a compression test and obtain same result with all 6 cylinders (9.5 to 9.8 Bar). While performing scanning of the car i got the following results:
1. Heated oxygen sensor bank 1 42% faulty with open or high resistance
2. Throttle .....available (i forgot) P1582 - “Flight recorder” data is stored
3. MAP permanent DTC
but to remove the P1582 fault the car is in flight recoder mode and i delete it by following some procedures. and its ok, but with MAP sensor permanent DTC. I remove the the inlet manifold and inspect the spark plugs and found all 3 cylinder in bank 1 is filled with dry carbon deposit(burning too rich) but with bank 2 only cylinder 1 is burning light grey and the other two still as new. I perform a data logger and all sensors is operating as it should be. I also remove the MAP and MAF sensors and place it on other vehicle with same engine, it perform very well and replace the MAP and MAF from the other vehicle and place it on the loss of power one, engine still loss of power. No cracks found in inlet manifold. while full throttle the air induct make a sound (vrrroooor) like if its getting too much air.
Please can you help me Thanks

 

Have you tried replacing the O2 sensor on Bank 1? The rich condition is probably a result of the failing unit. The 'vroooor' at full throttle is caused by the VVT (variable valve timing) activating (approx 5000 rpm). Sounds cool, doesn't it? Good luck.

 

Thanks for the reply. today i removed the catalytic converter on bank 1 and was damaged, the honeycm exploded inside. so on monday i will try to drive the car without catalytic and will see the result Thanks a lot. bye