I was talking to a guy that works for one of my customers. He has a 745i that he bought as a CPO car. He mentioned the transmisiion slam that happens occasionally. I told him this was a known problem and that they could probably fix it with a software update to his car (He knew nothing about even being able to update software on the car). In conversation, I asked him if he had ever reset the transmission. He hadn't, so I carefully explained how do to it.

Next time I saw him, he said he tried the transmission reset procedure and it seem to make a difference. The car seemed lighter to him. He then proceeded to say that the tack needle went all the way over when he did it, and that he only kept the gas peddle down for about 20 seconds because of this. By the look on my face, I think he could tell that he had not done something right. You guessed it - he missed the part about just turning the key to the on position without starting the engine. He had started the engine and floored his car for 20 seconds, with the rpm's just bouncing off the rev limiter!

I can only imagine what would have happened if these cars did not have a rev limiter.

 

HUmmm but it reset the tranny right?

so did he go back and try to reset it again without starting the key?

 

Ya, he's a real happy go lucky guy that just laughed at what he had done and said he would try it the right way when he had a chance. Hope he follows directions a little bit better this time.

 

its good he laughed it off. he must've enjoyed the sound though even if he didnt get a chance to hear a "click"

 

noob question for you guys... whats the procedure to reset the tranny? i know nothing about this...

 

Try this:
http://forums.e60.net/index.php?showtopic=40018