Lazy, Jerky, Horrible Throttle

[DevonPaul]

Hi, does yours do this on every gearshift or just on occasion? Sport button on or off,? These can suffer from awful kangarooing on occasion if youcome off the throttle say into a mini roundabout or junction in second gear and then come back on the throttle, it can be quite dramatic, and am coninced it is the fly by wire throttle as never had it in my z3m with a mechanical throttle cable. Seems to be when you have sport button on too. Other thing i have noticed , you mention lazy throttle response, I have always found throttle slow to pick up when blipped to rev match. I will try the throttle reset too as havent done that for a couple of years.

Hi not sure which one you are asking - for me my rev-drop issue on pulling away with light throttle or a drop/cough when stabbing the throttle at idle happens whether sport button is or or off. Have tried reset - I initially thought it worked because the car was cold and so the revs settled back at about 1000rpm but once warm and they are at operating idle thats when I experience the problem. My issues are basically sub-1000rpm

I'm reading this with interest as the wifes car does exactly the same, so much so that she sometimes avoids a route where we exit uphill onto a small but fast flowing roundabout. She's actaully losing confidence in the car and thinking of swapping to a Cayman

At idle, if I stab the throttle the revs dip then pick up, if I press gently all is well. When pulling away quick-ish it is very easy to give a bit too much throttle, the instinct then is to lift off slightly, which bogs the car down and leads to kangaroo-ing. My solution is that if the revs rise too much I dump the clutch and let the electronics keep me out of the local paper. It seems like the first 20% of travel gives about 50% throttle, then the rest comes in much more gently - almost the opposite of what you would expect (certainly my Maser only really kicks in with the pedal more than halfway).

I did wonder if it is partially down to the bottom hinged pedal - I find it a bit better if I consciously put my whole foot on it rather than pressing with the toe as I do in other cars as this reduces the lever effect on the pedal.

I know someone who is a software genius - does Superchips stuff and bespoke mapping. Sadly he's not well but I'm wondering about asking him to do a more sedate throttle map.

Paul

 

[Sam1977]

Hi, does yours do this on every gearshift or just on occasion? Sport button on or off,? These can suffer from awful kangarooing on occasion if youcome off the throttle say into a mini roundabout or junction in second gear and then come back on the throttle, it can be quite dramatic, and am coninced it is the fly by wire throttle as never had it in my z3m with a mechanical throttle cable. Seems to be when you have sport button on too. Other thing i have noticed , you mention lazy throttle response, I have always found throttle slow to pick up when blipped to rev match. I will try the throttle reset too as havent done that for a couple of years.

Hi not sure which one you are asking - for me my rev-drop issue on pulling away with light throttle or a drop/cough when stabbing the throttle at idle happens whether sport button is or or off. Have tried reset - I initially thought it worked because the car was cold and so the revs settled back at about 1000rpm but once warm and they are at operating idle thats when I experience the problem. My issues are basically sub-1000rpm

I'm reading this with interest as the wifes car does exactly the same, so much so that she sometimes avoids a route where we exit uphill onto a small but fast flowing roundabout. She's actaully losing confidence in the car and thinking of swapping to a Cayman

At idle, if I stab the throttle the revs dip then pick up, if I press gently all is well. When pulling away quick-ish it is very easy to give a bit too much throttle, the instinct then is to lift off slightly, which bogs the car down and leads to kangaroo-ing. My solution is that if the revs rise too much I dump the clutch and let the electronics keep me out of the local paper. It seems like the first 20% of travel gives about 50% throttle, then the rest comes in much more gently - almost the opposite of what you would expect (certainly my Maser only really kicks in with the pedal more than halfway).

I did wonder if it is partially down to the bottom hinged pedal - I find it a bit better if I consciously put my whole foot on it rather than pressing with the toe as I do in other cars as this reduces the lever effect on the pedal.

I know someone who is a software genius - does Superchips stuff and bespoke mapping. Sadly he's not well but I'm wondering about asking him to do a more sedate throttle map.

Paul

Hi Paul. I actually started a new thread on this because my issue seemed different to that of the original OP but it seems your problem is the same as mine. So hopefully you have read that thread. I seem to have resolved the problem with BMW inspecting the car and finding it didn't have OEM plugs. I was extremely sceptical about this being the cause but since I haven't had the car very long and have no idea when they were last changed I told them to change them. Picked up today and no longer have the rev drop when pulling away at low revs. I can recreate SORT OF the rev drop now but only at idle and only by doing stuff like stabbing and repeatedly stabbing the throttle before it even revs up causing it to hesitate slightly but in terms of normal driving and not messing around with it at idle it seems fine.

Seems to be a myriad of similar but in reality different issues with this car (that must be the DME since thats the only difference between M3 and Z4M engine as far as I know) but most - and I hope I am an exception - don't ever seem to get rid of it!

I wonder why they had a different DME in this model - anyone know?

All the best
Sam.

 

[nichollsz4]

UPDATE:

I was troubleshooting my car over the weekend and whilst doing, a coil pack completely failed on me. I had a spare coil pack from my old m3 which I knew was relatively new. Swapped out and we were back in business.

Whilst identifying the failed coil pack, I noticed a wash of different aged and branded coil packs where installed. Some were originals, others were old style Bosch coil packs. The original coil packs are made by Bremi and were known to be rubbish. I actually swapped them out on my old M3 when it developed a very faint, but annoying misfire. Its why I had a spare one in the first place.

So I ordered a full set of new Bosch coils packs and fitted on Tuesday. Since then, everything seems to be working as it should. I know longer seem to have lacy, jerky, horrible throttle and behaves in all conditions. It evens starts quicker!

Its worth noting that the car had never shown any indication of misfiring or failing at any time, so if you are having an issue similar to me, I would check the coils and if they are still on the original, replace them.

I managed to source a full set from car parts for less for just under £97 using code SAVE10 (Quidco also have 2.1% off)

https://www.carparts4less.co.uk/cp4l/c/BMW_Z4M+Roadster_3.2_2006/p/car-parts/ignition1/engine-parts/ignition-coil/?413110187&1&1071fee98c977fc3b35872264fdd9b9bb0403532&000197

I will continue to monitor the car and will report back any feedback relevant to this subject. For now though, all is well.

 

[ph001]

Great result. You wouldn't have coil packs high on the list to change with those symptoms so well done.

 

[Sam1977]

UPDATE:

I was troubleshooting my car over the weekend and whilst doing, a coil pack completely failed on me. I had a spare coil pack from my old m3 which I knew was relatively new. Swapped out and we were back in business.

Whilst identifying the failed coil pack, I noticed a wash of different aged and branded coil packs where installed. Some were originals, others were old style Bosch coil packs. The original coil packs are made by Bremi and were known to be rubbish. I actually swapped them out on my old M3 when it developed a very faint, but annoying misfire. Its why I had a spare one in the first place.

So I ordered a full set of new Bosch coils packs and fitted on Tuesday. Since then, everything seems to be working as it should. I know longer seem to have lacy, jerky, horrible throttle and behaves in all conditions. It evens starts quicker!

Its worth noting that the car had never shown any indication of misfiring or failing at any time, so if you are having an issue similar to me, I would check the coils and if they are still on the original, replace them.

I managed to source a full set from car parts for less for just under £97 using code SAVE10 (Quidco also have 2.1% off)

https://www.carparts4less.co.uk/cp4l/c/BMW_Z4M+Roadster_3.2_2006/p/car-parts/ignition1/engine-parts/ignition-coil/?413110187&1&1071fee98c977fc3b35872264fdd9b9bb0403532&000197

I will continue to monitor the car and will report back any feedback relevant to this subject. For now though, all is well.

Result! So yours was coils mine was plugs - neither of these things came up anywhere when I researched the problem. Good info for others hopefully!

 

[nichollsz4]

So it would seem. I may not have made the move if it wasn't for the coil pack failing in the first place.

 

[Lower]

I don't want to piss on your fireworks, but see what happens over the next 2-3k miles whilst the ecu relearns...

 

[Str6mik]

Just had my lambda sensor replaced after it threw a fault code

It must have been on the verge of throwing a fault for a while as I've been suffering generally rough running. The car feels absolutely fantastic now.

With the rogue bushes I've installed the car is absolutely mega at the moment

 

[Rene_Z4MC]

Just had my lambda sensor replaced after it threw a fault code

Replaced all four?

 

[53Fatman]

@ nichollsz4/Sam1977

Your Problems are still gone?