No More Hesitation
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
No More Hesitation
I wrote a thread a while ago about my persistant hesitation on off idle. Well I finally took it in and they did a check, but couldn't find any codes, however, they did something that improved it 200%. I tried to scan my service order but, couldn't (printer error), but here is what they did. They installed a MESFI code which was for the engine, and a ETC code for the transmission. I will ask when I get a chance what all of this means, but the performance now off idle is incredable, a totally changed vehicle. This thing now jumps instead of accelerating. He did say that the codes will not have any effect on "C" mode, but on "S" mode " will be more firm on acceleration", and boy is it ever. Just thought I would pass it along!! 
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
Until I figure out the fault on my printer (copier), all I can do is quote what he has written down.............
Wahatever 540991 control unit was tested, also 540992 control unit which I assume is the transmission control unit.
I just says that they installed code MESFI and code ETC, both are flashes. One has to do with the engine the other the transmission, as I understand it. I am planning on giving them a call tomorrow and try and get details, but I'll tell you, this thing is improved two fold. The car is night/day difference. I did not have a chance to get some highway runs, will do so tomorrow and report back. If someone knows the MB codes, they could probably have more detail on how it changes the performance.
Wahatever 540991 control unit was tested, also 540992 control unit which I assume is the transmission control unit.
I just says that they installed code MESFI and code ETC, both are flashes. One has to do with the engine the other the transmission, as I understand it. I am planning on giving them a call tomorrow and try and get details, but I'll tell you, this thing is improved two fold. The car is night/day difference. I did not have a chance to get some highway runs, will do so tomorrow and report back. If someone knows the MB codes, they could probably have more detail on how it changes the performance.
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Joined: Feb 2007
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2007 MB E63, 2006 LEXUS GS430
im interested in this as well.. after reading about the 63 hesitation problems on the forum i bought the sprint booster.. i would have to say for about a month i thought the sprint booster was a good buy.. now that i think about it i think it was just in my mind, or i have gotten used to it now.. i still experience the hesitation even with the sprint booster.
without the sprint booster there was hesitation at the start, now with the sprint booster i feel that there is hesitation when i have to put the pedal to the medal
im thinking about taking the sprint booster off and seeing how the car would react again.. all i know for sure is, whenever i reset the ecu, the car feels a bit faster for a few days..
without the sprint booster there was hesitation at the start, now with the sprint booster i feel that there is hesitation when i have to put the pedal to the medal
im thinking about taking the sprint booster off and seeing how the car would react again.. all i know for sure is, whenever i reset the ecu, the car feels a bit faster for a few days..
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From: Hollywood CA
2011 twin turboed prius
Please fix yer scanner Mr. Buckeyewalt
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MBWorld Fanatic!
Joined: Nov 2006
Posts: 9,137
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From: California, USA
E63 P30, CL500 Sport
I'm very interested to find out more details as well...... 
Even though my car never had the hesitation, it could definately use better and stronger acceleration
What date was your car built?
Even though my car never had the hesitation, it could definately use better and stronger acceleration
What date was your car built?
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
Here is the service order.........https://mbworld.org/forums/attachmen...1&d=1192135436
I don't believe I did it.....Most of you guys are computer smart...just a rookie here...but anyway, the difference is very noticeable....VERY. My car build is 0806...the mechanic said that this was a flash just released..he knew nothing about it, but thought he would apply it to my vehicle....there is major thrust in first and second. The hesitation is mostly gone, but that remains to be seen under daily driving.
I don't believe I did it.....Most of you guys are computer smart...just a rookie here...but anyway, the difference is very noticeable....VERY. My car build is 0806...the mechanic said that this was a flash just released..he knew nothing about it, but thought he would apply it to my vehicle....there is major thrust in first and second. The hesitation is mostly gone, but that remains to be seen under daily driving.
Last edited by buckeyewalt; Oct 11, 2007 at 04:56 PM.
MBWorld Fanatic!
Joined: Nov 2006
Posts: 9,137
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From: California, USA
E63 P30, CL500 Sport
Here is the service order.........https://mbworld.org/forums/attachmen...1&d=1192135436
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
if you click on the attachment, it asks you if you want to down load the document...say yes and it will open
Yep...you are right, it won't open I tried it on my laptop and it wont open....
E-mail on the way..!!!
Thanks MB
Yep...you are right, it won't open I tried it on my laptop and it wont open....
E-mail on the way..!!!
Thanks MB
Last edited by buckeyewalt; Oct 11, 2007 at 05:34 PM.
63 Hesitation Fix Codes
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
Likes: 0
From: West Tennessee
E63,,,not any more,,,BMW X5 50i
Hey MB Forever....Thanks for the help....I played with it some more and got it to work, (yeah like it was at fault)...anyway guys...this really worked for me. Don't know if it will work for the "55", but for my "63" it worked. Sorry for the poor uploads, I hope I can do it again..
Thanks again MB for the help!!!!
Thanks again MB for the help!!!!
MBWorld Fanatic!
Joined: Nov 2006
Posts: 9,137
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From: California, USA
E63 P30, CL500 Sport
Yes, it works now...... thanks 
I will try it next week when I take my car in for service. What bothers me is that everytime I take it in, my dealer says "your car has all the latest software updates and flash, etc...."
I understand I have one of the latest build dates for 07 models but I also know that new flashes and updates keep coming out all the time, and some have to apply to mine
I will try it next week when I take my car in for service. What bothers me is that everytime I take it in, my dealer says "your car has all the latest software updates and flash, etc...."
I understand I have one of the latest build dates for 07 models but I also know that new flashes and updates keep coming out all the time, and some have to apply to mine
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
Yes, it works now...... thanks
I will try it next week when I take my car in for service. What bothers me is that everytime I take it in, my dealer says "your car has all the latest software updates and flash, etc...."
I understand I have one of the latest build dates for 07 models but I also know that new flashes and updates keep coming out all the time, and some have to apply to mine
I will try it next week when I take my car in for service. What bothers me is that everytime I take it in, my dealer says "your car has all the latest software updates and flash, etc...."
I understand I have one of the latest build dates for 07 models but I also know that new flashes and updates keep coming out all the time, and some have to apply to mine
MBWorld Fanatic!
Joined: Feb 2005
Posts: 6,952
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From: Hollywood CA
2011 twin turboed prius
i don't know how you can convince them to install the new flash..other than telling them you have a hesitation or something....the first time I said this to my SA, he said that he didn't feel anything, which is bull, because now he said that he feels something when I accelerate hard, well I didn't have to accelerate hard, just a tip in off idle would do it...also a couple dozen of doughnuts for the guys worked wonders too...now when I say something that I need, I usually get the benefit of the doubt!!
Great ,
Thanks guys!!!
I will note this and ask my SA if I need it, likely we all do.
Newbie
Joined: Dec 2007
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2004 C320 coupe
can I operate/ reflash on my C320 coupe
I just bought a C320 coupe, 6speed. 2004 model.
Last edited by Lasers; Jan 2, 2008 at 04:27 PM.
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
If you take it in and ask them to reflash the ECU/transmission to the latest setting...you should be ok. Does your car have a hesitation..??
BTW.....even though my car is a whole lot better...it does still have some hesitation....I called MBUSA and got one of their roadside guys...and he said that he would have one of their field reps to give me a call, that was three weeks ago. Well no call to date..so I sent a nice
e-mail to MBUSA....that was on monday...so far no calls or e-mails yet........waiting....
BTW.....even though my car is a whole lot better...it does still have some hesitation....I called MBUSA and got one of their roadside guys...and he said that he would have one of their field reps to give me a call, that was three weeks ago. Well no call to date..so I sent a nice
e-mail to MBUSA....that was on monday...so far no calls or e-mails yet........waiting....
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If you take it in and ask them to reflash the ECU/transmission to the latest setting...you should be ok. Does your car have a hesitation..??
BTW.....even though my car is a whole lot better...it does still have some hesitation....I called MBUSA and got one of their roadside guys...and he said that he would have one of their field reps to give me a call, that was three weeks ago. Well no call to date..so I sent a nice e-mail to MBUSA....that was on monday...so far no calls or e-mails yet........waiting....
BTW.....even though my car is a whole lot better...it does still have some hesitation....I called MBUSA and got one of their roadside guys...and he said that he would have one of their field reps to give me a call, that was three weeks ago. Well no call to date..so I sent a nice
e-mail to MBUSA....that was on monday...so far no calls or e-mails yet........waiting....When I drove off parking lot I give like 50% throttle expect some kick but indeed it wasn't acclerating at all until like 2 seconds.
I just got my car like 2 weeks ago.
Thread Starter
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Posts: 402
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From: West Tennessee
E63,,,not any more,,,BMW X5 50i
Yep....that sounds like mine did and still does to some extent. The flash that they did to my car really did improve the acceleration off line..but I did still have the hesitation...not to the degree that it once was..but it still does!!
