kangarooing

M

mad4slalom

Senior member
still getting some kangarooing , only if i take away fast, almost like the electric throttle is very sensative, is this a common problem, could it be the throttle actuator or any other ideas, some say i will get used to it but i had it over a month , and done cluth stop, cdv, and gbox amsoil fluid change, have helped all the other issues a lot, but normally i get used to how a car drives in a day or so never had anything like this, i feel there is still a problem as i cannot believe bmw would put cars out with such an alien feeling drivetrain, i'm bewildered :headbang:
 
thanks, actually it drove really well last night, the best yet , the oil change has really helped the tightness in all shifts, gave it a wash and wax this morning ,took a few more photos so will try and post pics later. before i did the engine oil interim service , i ordered a new oil filter canister alloy lid so i could polish it up and then swap it over at oil change time, 26 quid but what the hell, any way, if someone wants my old one to do the same with, pm me, no charge but can just keep passing it around if anyone else wants to do the same, i like shiny engine bays, just done the vanos and ally pipes from the air con. :thumbsup:
 
Unles you're a complete muppet ( which for the purposes of this post we'll assume you're not!) you shouldn't be getting this problem when you floor the throttle. If I floor the throttle the car sprints away even in sport mode.
Ideally find another 'm' near to you and have a compare to see if it's a problem with the car.
 
I only ever get kangarooing when the engine is cold and I try to do a sharpish start, but then change my mind, as the throttle/engine is lumpy/slow to respond when cold.

I didn't bother trying the clutch stop, CDV delete, gearbox oil changes, but didn't have any issues with the gearbox/clutch/accelerator anyway as I was used to the notchy gearbox on other ///Ms.
 
mmm-five said:
I only ever get kangarooing when the engine is cold and I try to do a sharpish start, but then change my mind, as the throttle/engine is lumpy/slow to respond when cold.

I didn't bother trying the clutch stop, CDV delete, gearbox oil changes, but didn't have any issues with the gearbox/clutch/accelerator anyway as I was used to the notchy gearbox on other ///Ms.
Click to expand...

+1 on both these points.
 
thats what i am trying to determine, whether there is a problem with throttle actuator or something similar, i emphasised in previous posts that it was frustrating as i have never had a similar problem in any car in 35 years of driving, its all very well making smartass comments about "ive never had a problem " well you wouldnt understand if you have never experienced it, which points to not all cars have the problem, which makes me think mine may well have a problem which was the whole point of the post , to obtain some helpful info and suggestions, shame you not closer as you could maybe drive mine to give me the benefit of your obviosly far superior driving skills to compare the differences. as for the muppet comment, driving this car when experiecing the kangarooing, i feel like " Animal " playing the drums !!! so you may be half right. :?
 
mad4slalom said:
thats what i am trying to determine, whether there is a problem with throttle actuator or something similar, i emphasised in previous posts that it was frustrating as i have never had a similar problem in any car in 35 years of driving, its all very well making smartass comments about "ive never had a problem " well you wouldnt understand if you have never experienced it, which points to not all cars have the problem, which makes me think mine may well have a problem which was the whole point of the post , to obtain some helpful info and suggestions, shame you not closer as you could maybe drive mine to give me the benefit of your obviosly far superior driving skills to compare the differences. as for the muppet comment, driving this car when experiecing the kangarooing, i feel like " Animal " playing the drums !!! so you may be half right. :?
Click to expand...
I've experienced this in the early stages of ownership of my Z3MC (S54 with drive by wire) and with my Z4MC. The last time I experienced this in the Z4MC was when I switched on the Sport Mode at a roundabout, and the car just wouldn't accelerate: all it would do was kangaroo in 1st gear until I put it into 2nd gear then it would pull away. I then stopped and tried again to accelerate in 1st gear and I got kangarooing again. When I switched the Sport mode off, the problem was gone.

I think that when this happens, there's a conflict between a "feed forward" sensor and a "feedback" sensor, which creates the on, off, on, off, on, off... etc. repetitive cycle, which prevents the throttle from making the car accelerate. I'm sure that this is all down to the driver's left foot failing to release the clutch fast enough beyond the biting point, and perhaps the "feedback" sensor is recognising clutch slip, so the fuelling is momentarily cut, and so on, and this is what is causing the kangarooing?

In order to diagnose the problem further, can I suggest that you use 2nd gear to pull away to see if the problem still remains? Obviously, you won't be pulling away so fast, but if the problem still remains, then it would appear that you might have a problem sensor (but which one?). Does the problem occur when the Sport mode is both off/on? Like you, I've been driving for yonks and when this happens, it does make you wonder how this can happen with all your experience?
 
that is the kind of info i was hoping for , well explained and informative, really excellent post, you could obviosly understand the frustration from my previos posts, i too had it thr first time when i left sport on, as i aproached a midi roundabout, went to second, came off the throttle and went back on it to get the on off kangaroo. the way you describe it makes it easier to understand what is physically happening, and you're right ,i dont get it if i take away in 2nd, will try again to check, so may get more used to it yet maybe, remember to turn off sport in traffic, and yes ,you mention not getting my foot off the clutch quick enough, I'm sure i am guilty of that sometimes, especially before i did the cdv ,its better now than it was so will work on getting off the clutch better. now you have enlightened me more , I can even start to see why bmw may have fitted the cdv in the first place, so the driver can get off the clutch and the cdv sorts out the engagement in its own time ? they say its to protect the drivetrain from misuse, i can also see that without the cdv you would be more likely to shock the drivetrain by trying to get off the cluth quicker to avoid the kangarooing........aaaaggggghhhh... why did'nt they just fit a throttle cable like the S50 !!! fantastic post Exdos thanks again :thumbsup:
 
that is the kind of info i was hoping for , well explained and informative, really excellent post, you could obviosly understand the frustration from my previos posts, i too had it thr first time when i left sport on, as i aproached a midi roundabout, went to second, came off the throttle and went back on it to get the on off kangaroo. the way you describe it makes it easier to understand what is physically happening, and you're right ,i dont get it if i take away in 2nd, will try again to check, so may get more used to it yet maybe, remember to turn off sport in traffic, and yes ,you mention not getting my foot off the clutch quick enough, I'm sure i am guilty of that sometimes, especially before i did the cdv ,its better now than it was so will work on getting off the clutch better. now you have enlightened me more , I can even start to see why bmw may have fitted the cdv in the first place, so the driver can get off the clutch and the cdv sorts out the engagement in its own time ? they say its to protect the drivetrain from misuse, i can also see that without the cdv you would be more likely to shock the drivetrain by trying to get off the cluth quicker to avoid the kangarooing........aaaaggggghhhh... why did'nt they just fit a throttle cable like the S50 !!! fantastic post Exdos thanks again :thumbsup:
 
Happy to help! :thumbsup:

Personally, I think the Sport mode is a gimmick, although you have to try it, don't you? I like the very long travel of the throttle pedal, because it gives you a lot of scope to drive the car in a relaxed civilised way in urban traffic and also to modulate the throttle appropriately when driving flat out or in wet conditions without any need for DSC intervention. It's my experience that BMW electronics do not like crude "taking the car by the scruff of the neck" driving but will reward you with a smooth and balanced (faster) approach. There are considerable advantages to a drive-by-wire throttle; you just need to learn the differences to a throttle cable.
 
It took me four weeks to get used to the car and prevent it from kangarooring. Now I rarely have a problem even in sport mode. Be sure not to lift the throttle even in the slightest before disengaging the clutch. Needles to say never go from second to first unless your going to a accelerate hard. I don't think it's a drive by wire issue. Even cars with throttle cables are prone to this.
 
Hope you get to the bottom of your issue soon mad4slalom. Its clearly upsetting for you so hopefully exdos' explanation goes some way to help. For the record I think previous posts offering other types of feedback are all part an parcel of a forum thread.

Good luck.
 
i cannt forget the expression in the face of the guy I was buyng my coupe, during test drive...:D
took me good month to get used to the sensitive throttle and it already had cdv done... scares the sh*t hell out of my GF and she doesnt wanna drive it cos its scarry... great car and would not swap it for nothing...its very special to me and love the sport mode how precise the throttle is in high revs..
 
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