UPDATED::: Z4M S54 Engine Hesitation - POLL

Poll Poll Does your Z4M S54 suffer from the engine hesitation from idle?

  • Yes, and I'd like it fixed

    Votes: 91 35.4%

  • It did, but it's fixed

    Votes: 15 5.8%

  • Yes, but it doesn't bother me

    Votes: 13 5.1%

  • Yes, but it only happens once in a blue moon

    Votes: 39 15.2%

  • No, I've never had this happen

    Votes: 99 38.5%
  • Total voters
    257
NavZ said:
Dealer found a hole in my vacuum hose.
Hoping this will fix my issue.
If not, DISA/VANOS replacements next perhaps.
Any other recommendations?
It's all under warranty so any ideas would be appreciated, cost is no problem as it is all free :D
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I would say a hole in the vacuum pipe would certainly be causing you issues so you'll probably find it'll most likely fix your issues. Was it an obvious hole? Also was it on the intake elbow or somewhere else on the intake/vacuum pipes?
VANOS refresh is never a bad idea, our cars don't have DISA though :)
 
NavZ said:
If not, DISA/VANOS replacements next perhaps.
Any other recommendations?
Click to expand...

What is DISA? Never heard of this on S54 engine which this thread relates to??

ETA: NavZ.... might help to describe exactly what issues you had before this dealer 'fix'? What's being discussed in this thread is I'm sure you appreciate a quite particular issue. in attempts to cure this for those that suffer I expect they would have checked their hoses, but indeed it's worth looking at. FWIW I had the issue and resolved it, but the hoses were not the issue, although I'm still not sure what the solution was sadly.
 
TomK said:
NavZ said:
If not, DISA/VANOS replacements next perhaps.
Any other recommendations?
Click to expand...

What is DISA? Never heard of this on S54 engine which this thread relates to??

ETA: NavZ.... might help to describe exactly what issues you had before this dealer 'fix'? What's being discussed in this thread is I'm sure you appreciate a quite particular issue. in attempts to cure this for those that suffer I expect they would have checked their hoses, but indeed it's worth looking at. FWIW I had the issue and resolved it, but the hoses were not the issue, although I'm still not sure what the solution was sadly.
Click to expand...

Apologies, no DISA on the S54… "Intake Manifold Resonance Valve (also known as DISA Valve)"

I had a hesitation from idle, i.e. a lag before the car puts down its power.
It also had an issue where the revs would drop too far (on start up or when stopping) at idle before returning to normal.
Haven't collected the car yet so not sure if it has been resolved.
 
Mine just back from some major vanos surgery. Always needed a double blip to get the revs matched on down changes when cold which I took as a feature really as all the others I tried were the same. 2008 car with the latest software and done throttle resets etc. On 82k miles now. Last month it had new coil packs and plugs which fixed the odd time of taking a bit too long to start. New vanos unit and gaskets fitted today and now it revs and blips cleanly from cold. Extra 1 or 2 mpg more than expected on the way home too though have to see if that shows correctly longer term.
 
I've had the lumpy running around 2k when cold and the hesitation thing on my car for as long as i've owned. A DME reset always makes the problem go away, but it comes back over time. I cleaned the idle control valve, and that gave a temporary improvement, but i've never got to the bottom of the problem. I planned to replace the ICV but just didn't get round to it and learnt to drive round the problem.

However, i recently noticed that both symptoms seemed to have disappeared. Initially i put it down to the weather conditions, as the problem is less noticeable when the air temp is around 10 degrees. However, the problem hasn't been there with the warmer weather over the last few days and nor had it been there when we'd had frost a week or two ago.

Things rarely fix themselves, so something has obviously changed. I had the ABS pump refurbished recently and removal (which i did myself) involved disconnecting and taking out the air pump. Obviously i then had to refit it when i had reinstalled the ABS pump.

I didn't disconnect the battery whilst the ABS pump was out of the car, and i'd be very surprised if the ABS pump refurb has had any impact. However, i do wonder if removal and refitting the air pump has had an effect? Could a continuous air leak into the exhaust be throwing off the lambda readings and causing the DME to adjust fueling to try and correct it?
 
My car suffered periodically from the hesitation but it wasn't that often and I learned to drive round it. After two O2 sensors were replaced under warranty the hesitation has completely gone. Who knows if this is a cure but worth considering anyway.
 
Hi all,

I bought my Z4MC approx 12 months ago and experienced from day 1 the hesitation and idling issues described here. After spending a reasonable amount of money with an independent BMW specialist (who as it turns out is okay with standard BMWs but has no clue of how to work with S54 M cars) I was still experiencing this issue and getting quite frustrated with it.

With the fine work and how-to info of the good folk here I managed to resolve it myself by freeing up the ICV. The car now runs like an absolute dream. No hesitation. Idle sits like a rock on 900 RPM.

Thanks to those who give their time and expertise here. My car now runs like it should! :)

Cheers

Dan
 
Noticed an issue with me M, wondering if it's this.

When cold, the car is hessitant until 3k, and engine braking is very aggressive (it slows down very quickly when not on gas). I know it's thick oil, but I don't remember it doing this before the last few weeks. It's also due an I2 in 3k.

It's under warranty, and I'm tempted to throw it in for it's service earlier along with this issue.
 
I've started to note something similar to this on mine. 59k Roadster, driven a few K per year as a weekend toy. Also runs a GruppeM filter.

It starts everytime and doesn't waiver from 900 rpm on idle (no hunting). However, I find if I take my foot off the pedal around town, it will dip below 900 revs and then return. It has never stalled on me (touch wood) but if I am in, say, second gear and go WOT from 1.5k revs I can make the car jump quite violently as it seems to "catch up with" my throttle input.

From reading the (excellent!) info in this thread, this sounds like a TPS issue, so possibly should be my first port of call?
 
I neever had this issue with mine(posted as such on this thread,back in 2012),but it started doing it and was spoiling the otherwise excellent driving experience a wee bit...
So I took it to my BMW Indy las week,and asked him to remove and then clean the Idle control valve, which I can safely say has cured the issues I was having with hesitation/spluttering at upto about 3k rpm,as well as eractic idling.

The car is now back to driving as good as it always did,so if anyone else is having these issues,worth cleaning the icv first :thumbsup:
 
craig3.2 said:
I neever had this issue with mine(posted as such on this thread,back in 2012),but it started doing it and was spoiling the otherwise excellent driving experience a wee bit...
So I took it to my BMW Indy las week,and asked him to remove and then clean the Idle control valve, which I can safely say has cured the issues I was having with hesitation/spluttering at upto about 3k rpm,as well as eractic idling.

The car is now back to driving as good as it always did,so if anyone else is having these issues,worth cleaning the icv first :thumbsup:
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Thanks for the input, Craig. I've decided to spend a bit of time on preventative maintenance and love for mine, so have ordered a new MAF, TPSx2 and will clean the ICV while I have the car apart. Means it's given a nice new bill of health!
 
Resurrecting an old thread has anyone got to the bottom of the revs at idle issue? My car feels like it's about to stall when I depress the clutch and then bounces back to idle
 
ratty64 said:
Resurrecting an old thread has anyone got to the bottom of the revs at idle issue? My car feels like it's about to stall when I depress the clutch and then bounces back to idle
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One of these will be the culprit, ordered by what I would do/check/replace first.

Idle control valve. This should open and close freely to allow enough air to bypass the closed throttle flaps to keep the engine idling correctly. They gunge up and need periodic cleaning, due to their location (under the big air plenum) this seldom happens. You could try taking the top pipe off and generously spray carb cleaner down it a few times over a week or so, or remove the air plenum to then remove it and clean it up properly or replace with a new one. Whilst off you can also clean the throttle bodies. A few guides exist on the web on how to do this with pictures.

Throttle position sensors; one of the front of the the throttle butterfly bar (next to oil canister lid) and another the throttle actuator (again under the air plenum) - they are simple potentiometers and just wear out. I changed both but thinking back I suspect cleaning the idle valve made the biggest difference.

Air Flow Meter (mine was replaced under warranty a few years ago, it did not cure the idle bounce but generally drove better after with slightly better mpg too).
 
Hi !

Read all over the 24 pages here.

Just bought a 2007 z4m with 11.000 Km and this thing is happening.

There´s only 5 in my country and no ones knows how to fix it. I´ll just buy everything you guys mentioned here and i´ll do it by myself. By the way, thanks for sharing all the information and all the work you did.

I didnt see any links for the parts, can any of you confirm it?

This is the TPS sensor? (I need two of these, right?)

https://parts.bmwofsouthatlanta.com/products/THROTTLE-VALVE-SWITCH-4-KOHM/1297544/13637840383.html

Idle Control Valve

https://parts.bmwofsouthatlanta.com/products/T-SHAPE-IDLE-REGULATING-VALVE/1275514/13411733090.html

Intake Camshaft Sensor

https://parts.bmwofsouthatlanta.com/products/BMW-Z-Series-E52-E85-E86-E89/2007/Z4-Convertible-M32/Pulse-generator--camshaft/1269023/12147539171.html

Throttle actuator

https://parts.bmwofsouthatlanta.com/products/BMW-Z-Series-E52-E85-E86-E89/2007/Z4M32Convertible/Throttle-actuator/1280314/13627840537.html

Thanks again!
 
Hi enzotieppo. Well done for choosing the Z4M. Where are you based? You should introduce yourself in the newbies forum and post some pics :thumbsup:
 
Bump. Good thread. My car is doing this badly again after being laid up for a while.

I will remove the idle control valve when I get a chance and clean it or quite possibly just replace the poxy thing.

There is something very different between the Z4M and E46 M3 S54 implementations in this respect because E46 M3 does not do this.

I know the engine management systems are different and it must be something related to the different programmes which are running between the two cars in my opinion.
 
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