BMW Z4M S54 - slight hesitation/stutter when you press the accelerator from idle.

[Adamw]

As per title, I have a slight hesitation/stutter when you press the accelerator from idle.
Can only describe as a ‘tiny cough/miss’.

I’ve had this since I’ve owned the car (last Oct) but thought maybe normal behaviour of s54 as no other warning lights or misfires through the rev range and it pulls very strong.

I drove a mates e46 m3 and he drove mine and he picked up on this too and his car doesn’t do this.

After a quick google search a few suggestions came up:
* Dirty or aging MAF sensor
* Throttle actuator synchronization
* Coil packs or spark plugs starting to weaken
* Intake air leaks (perished rubber / vacuum leaks)

It does this regardless of the engine temp & as mentioned it’s just off idle / low revs.
There’s no engine light / misfire or any other signs of issues.

I wondered if anyone had experienced anything similar ?

 

[bigwinn]

Yeah I have

I started off by replacing the two throttle position sensors- one at the front and one at the rear of the fuel rail

That made a difference and I checked the throttle linkages for smooth operation

However a few months later the stutter returned and threw a code for throttle actuator stiffness

I did a thread on the throttle actuator rebuild as I needed to remove it and had it sent to a chap in Spain who did a proper job

It’s not come back yet

 

[DevonPaul]

Our has always done it, especially if you press the pedal hard.

Replacing the TPS helped for a bit, but it came back. Seems fine if you 'pre-load- the slack on the throttle.

 

[Mr Tidy]

Mine has been prone to that as well.

 

[MrPT]

There's a big ol' thread on it here.

Are you able to reset the throttle adaptations (e.g. using INPA)? Might not be a permanent fix, but could point you towards one. If you have INPA you can also run a throttle actuation test (although it should be fine/healthy if no errors are being thrown).