Kangaroo jumps in Sport mode E46 M3
Discussion
Hi, does anyone know why on earth my car has CRAZY stop start stop start jerks sometimes in 1st and 2nd gear (about 3-4k revs)?
Mainly happens in Sport Mode (although it has happened in normal) and only seems to do it once in 5 or 6 occasions.
Can't pin it down to one particular thing, but the only way to stop it doing it is to change up or floor it to about 7k revs!
Mainly happens in Sport Mode (although it has happened in normal) and only seems to do it once in 5 or 6 occasions.
Can't pin it down to one particular thing, but the only way to stop it doing it is to change up or floor it to about 7k revs!
Nope, my foot is constant. I've made a conscious effort to ensure that it's not driver error!
It's really bad when it does it, not just a little 'bunny hop' but as if you are flooring the throttle then letting go then flooring, etc etc.
There must be something wrong as i'm sure it's not supposed to do this so violently, it's completely intolerable when it does it.
It's really bad when it does it, not just a little 'bunny hop' but as if you are flooring the throttle then letting go then flooring, etc etc.
There must be something wrong as i'm sure it's not supposed to do this so violently, it's completely intolerable when it does it.
There's nothing wrong with it, it's what these engines do. It is less likely to occur once the engine warms up but can still do it once up to normal operating temperature. And before someone suggests it, it has nothing to do with SMG.
My old M3 was actually not too bad for the kangarooing but my Z4MC is more sensitive to the phenomenon. At any rate it's present in all cars with the S54 engine, my car seems more prone to doing it it depending on the fuel used. Vpower is worse, Tesco99 a big improvement.
The answer is dipping the clutch, if you have one, or foot to the floor.
My old M3 was actually not too bad for the kangarooing but my Z4MC is more sensitive to the phenomenon. At any rate it's present in all cars with the S54 engine, my car seems more prone to doing it it depending on the fuel used. Vpower is worse, Tesco99 a big improvement.
The answer is dipping the clutch, if you have one, or foot to the floor.
Edited by dgm on Monday 30th June 00:29
Edited by dgm on Monday 30th June 00:30
Vixpy1 said:
Once the car is warm, it should not happen at all. .
When the E46 M3 came out I gave it the name M-Jerk 
If he's getting the usual M-Jerk type thing then your statement is incorrect - it happens all the time. If anything it's much more common when fully warm, as your engine is running full power. (It also runs crap when cold but that's a different thing).
All E46 M3's (and some lesser models like the E46 330) do this M-Jerk thing and always have. It's slightly worse with SPORT ON but it's certainly not limited to that mode. It's usually triggered by an uneven road surface which sends a shock into your throttle foot, which in turn starts the whole on/off action which causes the 'M Jerk'. The solution is to 1) back off completely 2) mash the throttle or 3) change gear.
Basically you end up looking like a learner.
You will end up getting it less as you drive car, but only because you will learn to anticipate it and drive around it.
I can do it at will as it's very easy to do (when warm, just drive along in 2nd gear at 20-odd MPH and give the throttle some good on/off stabs
).Of course he may have a seperate fault but even if he does, and it's fixed, he'll still have the M-Jerk feature. In this case it sounds completely normal as per the above.
Edited by MrOnTheRopes on Monday 30th June 06:31
I had exactly the same problem a while back on my Peugeot and it was the throttle pot which had worn.
It happened at roughly 3000rpm which was where the engine spent most of its time, the track had worn and it was getting no signal, then move it a tiny tiny amount and it got a signal, so kept going from no fuel to fuel needed for 3025rpm etc.
Like Vixpy says, it would be worth getting your DBW checked.
Dave!
It happened at roughly 3000rpm which was where the engine spent most of its time, the track had worn and it was getting no signal, then move it a tiny tiny amount and it got a signal, so kept going from no fuel to fuel needed for 3025rpm etc.
Like Vixpy says, it would be worth getting your DBW checked.
Dave!
Every E46 M3 I test drove did this.... very annoying, violent and embarassing, looks like you've just started driving.
You need to upgrade the CDV. I did this on my Z4 and it vastly improved the grear change and stopped the Kangaroo effect. Costs around £40 and less than an hour to fit at your local independent.
Read the theory and order from here.
http://www.zeckhausen.com/CDV.htm
You need to upgrade the CDV. I did this on my Z4 and it vastly improved the grear change and stopped the Kangaroo effect. Costs around £40 and less than an hour to fit at your local independent.
Read the theory and order from here.
http://www.zeckhausen.com/CDV.htm
audi321 said:
IF THIS IS NORMAL THE CAR IS GOING BACK!! 
Seriously though, it's so violent it's unbearable, this cannot be normal.
I had read about some 'bunny hopping' but this throws you forward and back like you've been involved in a crash!
Although, I am using V Power and it is SMG........
My dad has an M3 with the SMG gearbox and it bunny hops so violently that its impossible to hold a steady throttle!Seriously though, it's so violent it's unbearable, this cannot be normal.
I had read about some 'bunny hopping' but this throws you forward and back like you've been involved in a crash!
Although, I am using V Power and it is SMG........
I drove his car back from the last PH Sunday Service in Wadhurst and he put it in sport mode without my knowledge while I was waiting to pull out of a busy junction! (he thought it was funny, i didn't!) As soon as I touched the throttle the car lurched and jumped violently accross the road... the only option was to either floor it or come off the throttle completely take it out of sport mode and pull away smoothly... neither exactly safe when crossing a busy road.
Whenever I drive his car I only ever use sport mode on fast A or B roads, as soon as I drop below 40mph it comes off, it is a great function and I enjoy using it, in the right situation it makes a huge difference.
Edited by Rochester TVR on Monday 30th June 10:16
The sport button isn't the cause, it only exacerbates it because the throttle pedal requires less travel to accelerate. Due to the increased sensitivity of the pedal with the sport button on, when the car starts to kangaroo your pressure on the pedal becomes erratic and adds to the effect.
This is not the huge problem you think it is, you will get used to it quickly and learn to drive around it. You will still get caught out occasionally but it can be brought back to normal quickly and instinctively.
This is not the huge problem you think it is, you will get used to it quickly and learn to drive around it. You will still get caught out occasionally but it can be brought back to normal quickly and instinctively.
It's been a well documented issue on mtorque over the years, some cars are more prone to it than others. It's less likely to occur when the engines warm but it can still happen. As I said it wasn't a huge issue on my M3 but is much more prevalent on my Z4MC. It had totally behaved itself on a recent trip to France but when I came back I filled up with Vpower in the UK and had a few kangaroo moments. Once filled up with Tesco99 the issue is all but gone.
Vixpy1 said:
dgm said:
Vixpy1 said:
Once the car is warm, it should not happen at all. Like i said.. get your DBW system checked.
Not the case at all I'm afraid, it is well known to kangaroo when warm as well.It can be done 'on demand' - have you tried it? (as per earlier post)
(as has been said, they all do it providing they're factory OEM not modified)
Edited by MrOnTheRopes on Monday 30th June 12:07
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