X6M Multiple Misfires
Posted: Sat Mar 09, 2024 9:12 am
Going on from the thread 'Where Is Everyone?' I thought I would describe my tinkering.
Car went into a limp mode on a long journey, slowly got it home after which it went back to normal albeit with a long crank start time when it is normally instant.
As we all know it's impossible to do anything without scanning, and I am in the good fortune of working in a bike shop attached to a garage with a lot of scanning gear.
Anyway error codes showed multiple misfires cylinder deactivation and implausible high pressure fuel reading pointing to the high pressure pumps (two of them on this engine type).
As I had not continued the extended warranty in January as £1500 was a bit much (or maybe bmw know something.....) I was fixing the problem myself.
A quick check with bmw nearly gave me a heart attack as I'm sure the price of a grand each was mentioned. I think not, genuine Bosch pumps were £220 each which is a bit better.
So, off with the cover to discover one of the pumps has a smashed wiring connector, dangling on only by a thread, and various other components loose or not in place. Bear in mind that until this point I had NEVER done any work on this car and it it full main dealer service I was not best impressed.
Changed the pumps which took about an hour and its all back to normal.
Now I have the car in the air I will be having a good check over it, the engine was removed a couple of years ago since a main dealer damaged injectors trying to remove them and dropped bits into the cylinders. I would have thought the injectors would have come out easily as it was the third set it had been fitted with. Probably done by the apprentice.
It also has a had a persistent battery drain since the engine work which is down to a permanently running charge air cooler coolant pump. Anyone want to bet it has damaged wiring with this as well?
And we will not mention the heavy fuel leak nearly resulting in a fire.
Maybe electric vehicles are the future, when it stops plug in a new module, the computer will tell you how to do it so you don't need a so called master tech to fix things.
Car went into a limp mode on a long journey, slowly got it home after which it went back to normal albeit with a long crank start time when it is normally instant.
As we all know it's impossible to do anything without scanning, and I am in the good fortune of working in a bike shop attached to a garage with a lot of scanning gear.
Anyway error codes showed multiple misfires cylinder deactivation and implausible high pressure fuel reading pointing to the high pressure pumps (two of them on this engine type).
As I had not continued the extended warranty in January as £1500 was a bit much (or maybe bmw know something.....) I was fixing the problem myself.
A quick check with bmw nearly gave me a heart attack as I'm sure the price of a grand each was mentioned. I think not, genuine Bosch pumps were £220 each which is a bit better.
So, off with the cover to discover one of the pumps has a smashed wiring connector, dangling on only by a thread, and various other components loose or not in place. Bear in mind that until this point I had NEVER done any work on this car and it it full main dealer service I was not best impressed.
Changed the pumps which took about an hour and its all back to normal.
Now I have the car in the air I will be having a good check over it, the engine was removed a couple of years ago since a main dealer damaged injectors trying to remove them and dropped bits into the cylinders. I would have thought the injectors would have come out easily as it was the third set it had been fitted with. Probably done by the apprentice.
It also has a had a persistent battery drain since the engine work which is down to a permanently running charge air cooler coolant pump. Anyone want to bet it has damaged wiring with this as well?
And we will not mention the heavy fuel leak nearly resulting in a fire.
Maybe electric vehicles are the future, when it stops plug in a new module, the computer will tell you how to do it so you don't need a so called master tech to fix things.