Transmission problems after remap

[Isambard]

Hi All,

I've just had my 2001 4.4 beast remapped. The day I got it back she was crisper than a really crispy thing-big grin on my face!!

BUT a day or two later she started acting up, like when driving from cold she would jerk when pulling away from standstill. This was using a constant pressure on the throttle-not accelerating any faster but just allowing the car to pick up itself, albeit jerkily!! Then once the engine is warm the gear selection feels odd. I will be driving fairly sedately for example, 1st, 2nd, 3rd, 4th, around 20-30mph which is fair enough, though I do think that high a gear selection is...er.. a little high for that speed?? Before the remap I think I remember the car staying in 3rd at the most around that speed, and if I pushed down on the throttle a little more then 2nd would be selected.

Since this time it has been back to the tuners and they say there is nothing wrong with the remap and that its a transmission fault, and that I should take it to the stealers to have it checked out.

Personally I cant believe this is simply a coincidence, but before I do anything more, I just want to be sure of my facts. So if you guys can shed any more light onto this episode I would be very grateful. Can the transmission/adaptive driving feature be upset/be affected by a remap. Again, personally I think it has at least upset something in the air/fuel mixture region as there is jerking when cold....

Thanks, Ian

[vinuneuro]

Try this and see if it helps any:

Throttle Adaptation Procedure

[weasel56]

So where did you have it "remapped"? Because the OEM software is highly integrated and the DME and EGS communicate through can bus... if it isn't BMW software, it could have affected the communication between the modules. The EGS uses ALOT of imputs and signals from the DME to lay out its shifting characteristics, such as throttle percentage, % of load, RPM, etc. And the DME uses signals from the EGS as well.

So if it is NOT BMW approved software such as DINAN (who really is the only way to go for performance programming) then chances are thats your problem. It might be worth getting the dealer to reprogram the DME with OEM software and possibly perform EGS encoding as well. Should only be a couple hours labor charge...

While it isn't uncommon for higher mileage X5 transmissions to have problems, it sure would be one hell of a coincidence!

[Isambard]

No, it wasn't DINAN, but a supposed reputable tuning company here in the UK. I've spoken to them and the bottom line is that I am having the car put back to standard and getting a refund.

Thanks for all your input guys, much appreciated.

[weasel56]

Hope all works out well after back to normal. Good luck!