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X6M Multiple Misfires

Discuss your latest mods or ideas, and anything to do with the X6 (E71).
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IanP
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X6M Multiple Misfires

Post by IanP » 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.

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X5Sport
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X6M Multiple Misfires

Post by X5Sport » Sat Mar 09, 2024 9:25 am

One of my colleagues had a Mini looked at by a main dealer after they had serviced it and things weren’t right. Their ‘bill’ for fixing things was over £5k. The car had been looked at by a reputable BMW specialist only a week before and no major issues found or logged, but suddenly a main dealer found lots of problems.

After talking to a couple of us in the office and showing the ‘repair list’, we suggested that the individual challenge the dealer with this. Suddenly all the repairs were covered under a recall (which doesn’t exist in the database as that’s been checked) and was done for free!! The car came back with damage to the throttle body and a broken dipstick tube. The Dealership denied all responsibility and have told the owner never to darken their doorstep again. This was taken to BMW UK who wanted nothing to do with it (as usual it seems).

The Indy (owned and run by an ex-BMW Master Tech with all ex-BMW Technicians - he pays better) is slowly putting things right and is pretty sure the issues have been caused by an individual at the Dealership not caring about the work.

It doesn’t say much about the standards BMW themselves are permitting, nor about their caring attitude either.

Two years ago another main dealer told me I needed suspension work on the X6. I ignored them and it’s been through two MOTs and two BMW ‘safety inspections’ with no fault found. Makes you wonder doesn’t it.
:ant: Never anthropomorphise computers. They hate that.

IanP
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X6M Multiple Misfires

Post by IanP » Mon Apr 08, 2024 9:26 pm

Well, battery drain turned out to be a damaged charge air coolant pump. Had the be the hard one to get to. And continued to find missing fasteners, unclipped pipes and so on. Really must have had the apprentice on this car.
If any one has a problem like this it came up as a LIN wire fault

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