No advice just making your post more readable
This is my first post and also third forum but still unlucky in finding help. From last 2 months I have a problem with my X3 30d F25 2012 with 77000 on the clock. Car is behaving very weirdly and the moment nobody can tell what is going on with it and I can't find anything online.
Suspicions are that this is a Transfer case or transmission but nobody can tell at the moment. I will try to describe as best as I can.
Car have a kinda of power hesitation or delay. It is happening most of the times but not all the time. No problems with start or idle at all.
For example driving at any speed between 30-70miles/h on around 2000 revs trying to accelerate dynamically but what car does first is kinda dropping revs to let's say 1700 like car would decided to change gear to higher(today once did even down to 1500) and then the revs are going back up.
Or for example there is a hesitation in general and most of the times whenever I want to accelerate fast from lower revs for example going on 1000 revs and press acceleration hard then car is moving but not much faster untill will hit turbo range and then pulling as it should. But this thing can happen on the higher revs too.
I have been to BMW specialsists to BMW dealer, automatic transmission place and to the guy who does transfer cases only too. Car doesn't really make any suspicious noises.
Things on the car done up to date.
1. EGR valve replaced (thrown code at BMW specialists and after replacing no more codes)
2. Change 4 tyres to Pirelli P Zero. For few weeks I was running on the rear with one new budget tyre and one P Zero with around 4mm tread) And 2 same new budget on the front. I have staggered wheels.
3. Changed fluid in the transfer case and reseted transmission.
4. Cleaned MAF No change at all.
Next not too expensive step (Spent £1400 already) would it be doing transmission updates.
Please follow the link to see video with the symptoms of revs dropping. You can see it twice starting at 11sec that after acceleration the revs are dropping from 1500 to about 1200 to go up again.
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Appreciate any advices or suggestions guys