Took a look at a P38 with a rough running engine today. It was a late model P38 Range Rover with the Bosch management system.
It had a fresh engine rebuild so there was no mechanical faults with the car. The engine was a little rough and wouldn’t rev past 3000 rpm.
When I plugged in there were a handful of faults logged. These were cleared as I didn’t know how long they had been there.
I normally prefer to reset faults and then look at dynamic values to get an idea whats wrong.
Reading the dynamic values all seemed fine. The oxygen sensors were reading OK, there were no logged misfires. The only strange looking value was the MAF sensor reading. At idle the values were changing quite a lot. I decided to kill the engine and then disconnect the sensor as the Bosch system can run without the air flow sensor.
Sure as eggs are eggs the engine ran fine without the sensor. We ordered a new item and this should cure the fault.
