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
Beedub said:
m5.... we have all been through this with a car we love!! I'm sure you have with the 5... GL, on another note, hows the oil temps?
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Other than these odd/random gremlins, the car is great, no issues with coolant/oil temps. Once it's moving there's no issue, and it not cut out since. Even the low idle is not all the time.

1st gear is sometimes very stiff to engage with the pedal on the floor, so don't know if that is related to the recent clutch/flywheel replacement - just not had any time to get it back to Graham Martin to check, but when I do I will ask them to look at the idle/stalling too.
 
So a bit of an update from my local specialist.

Found some errors in the DME, cleared them and updated the software and all the issues seem to be solved. He's keeping the car a few more days to see if this is a perminamt fix. I haven for my hands on yet but will know more next wednesday when I pick it up.
 
Popey said:
So a bit of an update from my local specialist.

Found some errors in the DME, cleared them and updated the software and all the issues seem to be solved. He's keeping the car a few more days to see if this is a perminamt fix. I haven for my hands on yet but will know more next wednesday when I pick it up.
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Don't forget that resets all the adaptations, which is known to be a temporary fix only
 
Picked my car up this morning and I must say it feels a lot better.

They found a few errors on the the DME, I do have a print out but not to hand (one was a checksum error). The faults were cleared and the DME reprogrammed it (it now has a new part number?).

Car is now much smoother to drive and it seems to have improved performance (this may just be in my head)
 
Hi All,

Just to report back as I was quite active on this thread earlier on, have not posted for a while and will no longer be posting on this forum.

To recap, I replaced both TPS's, reprogrammed the DME to latest version and tried numerous other things to no avail.

I eventually cleaned out my ICV and inlet trumpets which resolved the issue. After a few thousand miles, the car slowly regressed and then went back to hesitating and spluttering as we know.

A few weeks ago I purchased a new part from BMW and am pleased to say this has once again resolved the issue for me. Car also does not do the strange dipping / missing when blipping the throttle from idle which it does when the car is also hesitating and spluttering, so these issues are one and the same in my opinion.

Best of luck all!
 
Thanks sniffer, very useful

sniffer said:
Just to report back as I was quite active on this thread earlier on, have not posted for a while and will no longer be posting on this forum.
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How come?
 
DPG said:
Thanks sniffer, very useful

sniffer said:
Just to report back as I was quite active on this thread earlier on, have not posted for a while and will no longer be posting on this forum.
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How come?
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http://www.z4-forum.com/forum/viewtopic.php?f=9&t=81482

Don't want to start name calling against certain individuals, but this has really pissed me off, so time to leave. :?

Best of luck all. :thumbsup:
 
sniffer said:
Don't want to start name calling against certain individuals, but this has really pissed me off, so time to leave. :?

Best of luck all. :thumbsup:
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Sniffer,

Appreciate your sentiments in the other thread but i would be very appreciative if you would update this thread in a month or so to let us know if the ICV replacement has fixed the problem long term.

I've been in the same position as you where a DME update gives a temporary improvement, cleaning the ICV gives a temporary improvement, but i'm very interested to see if replacing the ICV gives the same temporary improvement or whether its the long term fix.
 
He won't be back - his profile has been disabled, at his request I assume...
 
So mine suddenly lost all power at about 20 mph in 2nd earlier. I coasted to a stop and restarted the engine - all fine. It hesitates a little when cold, not a lot and never anything like this when warm.

Its never done that before, is it worth getting the ECU read at the local stealers just to check, or should i wait and see if it does it again?
 
Get the codes read at a friendly indy (i'd imagine foc if you ask nicely), unless you fancy having your pants pulled down at BMW.
The problem you are describing though is not the problem being discussed in this thread I'm pretty sure.

ETA: I had the same thing happen to me with my old porsche, turned out to be the MAF. Different engine of course but if it happens again, pull the MAF plug and see if the car works ok. It should run fine-ish without the MAF, if you then plug it back in and you have problems then you know where you are.
1st get the codes read though.
 
My hesitation is cured! I hadn't driven the Z in a couple of weeks and now it's completely cured. I've not done anything different, other than fill up with Esso Super Unleaded rather than Shell VMax. Interestingly enough, it's coincided with two errors in the DSC module - 5E35 and 5E18. Surely it can't be related?
 
My understanding is that the DME takes at least a few tanks to re-adapt to the different fuel so I suspect the esso/vpower change has nothing to do with it. Hope it lasts for you, it was super annoying when mine used to do it. Have you looked up the fault codes, anything obvious?
 
Yes I agree, the fuel won't have anything to do with it. I'd preveiously tried all brands and cleared the adaptations - all of which made no difference. The fault codes relate to a faulty wheel speed sensor and a faulty DSC module. I think the engine ECU take an output from the DSC so it knows whether the car is moving or stationary, so perhaps that's the link. It's having an Inspection II in January and is under BMW warranty so I'll see if when they fix it the hesitation returns!
 
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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