Overenthusiastic traction control?

R. E92..

I think you are wandering off the point...the OP has a bog stock 64 plate 20i auto E89....supplied by a main dealer and in warranty..

So he will have whatever bmw oem fitment wheels and tyres...so all within tolerances ...

Therefore your probable cause analysis was not valid given the car specifics..

In that context your original technical description was incorrect..

There may be issues arising from significantly asymmetrical set ups on E8x platforms...but that isn’t because there are only two wheel sensors...

The code that drives all these systems is not in the public domain so no one apart from BMW and their partners knows what hard and soft limits have been set up in the various computer systems..

The more I read how sophisticated and interlinked these myriad of systems are on the e89 the more wary I am of simple fixes or improvements that people suggest..
 
Perhaps it's just a broken wire that breaks when the wheels rise over the hump.
Try to see if just the front or rear sets it off.
 
My best guess would be dodgy yaw sensor or acceleration sensor. The yaw ones do fail on the E46 occasionally and it’s probably the same sensor.
 
Pbondar said:
R. E92..

I think you are wandering off the point...the OP has a bog stock 64 plate 20i auto E89....supplied by a main dealer and in warranty..

So he will have whatever bmw oem fitment wheels and tyres...so all within tolerances ...

Therefore your probable cause analysis was not valid given the car specifics..

In that context your original technical description was incorrect..

There may be issues arising from significantly asymmetrical set ups on E8x platforms...but that isn’t because there are only two wheel sensors...

The code that drives all these systems is not in the public domain so no one apart from BMW and their partners knows what hard and soft limits have been set up in the various computer systems..

The more I read how sophisticated and interlinked these myriad of systems are on the e89 the more wary I am of simple fixes or improvements that people suggest..
Click to expand...

My point is that he just needs to check his tyres out before jacking the car up for a full inspection. If OP has OEM tyre sizes and matching tyres across the axles then it's time to look elsewhere. Over active traction and stability control is something which people also notice when mixing runflat and normal tyres.

The problems I described are across the E89 chassis family. That includes the E89 Z4, all E9x 3 series models and the E8x 1 series models.
In fact having larger or smaller rear wheels is a problem on almost all cars with modern stability control systems.
I described an issue with mismatching tyres which perfectly fits the description and is present on all vehicles mentioned above. I don't know why this upsets you so much.
 
I also think it's the ABS sensor. I had the same symptoms on my old E81 1 series. It progressed into the DSC flashing when turning (left or right depending on which sensor was bust)
 
R.E92 said:
Pbondar said:
R. E92..

I think you are wandering off the point...the OP has a bog stock 64 plate 20i auto E89....supplied by a main dealer and in warranty..

So he will have whatever bmw oem fitment wheels and tyres...so all within tolerances ...

Therefore your probable cause analysis was not valid given the car specifics..

In that context your original technical description was incorrect..

There may be issues arising from significantly asymmetrical set ups on E8x platforms...but that isn’t because there are only two wheel sensors...

The code that drives all these systems is not in the public domain so no one apart from BMW and their partners knows what hard and soft limits have been set up in the various computer systems..

The more I read how sophisticated and interlinked these myriad of systems are on the e89 the more wary I am of simple fixes or improvements that people suggest..
Click to expand...

My point is that he just needs to check his tyres out before jacking the car up for a full inspection. If OP has OEM tyre sizes and matching tyres across the axles then it's time to look elsewhere. Over active traction and stability control is something which people also notice when mixing runflat and normal tyres.

The problems I described are across the E89 chassis family. That includes the E89 Z4, all E9x 3 series models and the E8x 1 series models.
In fact having larger or smaller rear wheels is a problem on almost all cars with modern stability control systems.
I described an issue with mismatching tyres which perfectly fits the description and is present on all vehicles mentioned above. I don't know why this upsets you so much.
Click to expand...

I think the basic premise is, (as implied by R.E92), to always check the easiest things first and discount them before diving into complicated, potentially expensive stuff.
Will only take 5 minutes to note the tyre sizes, stick them on the forum and get an answer.
 
[/quote]

I think the basic premise is, (as implied by R.E92), to always check the easiest things first and discount them before diving into complicated, potentially expensive stuff.
Will only take 5 minutes to note the tyre sizes, stick them on the forum and get an answer.
[/quote]

I think we all agree that fault diagnosis, especially armchair diagnosis is that it’s based on probabilities... :thumbsup:

Therefore a new 3 month old owner of a car bought from a main stream bmw dealer under a full warranty will NOT be supplied with non OEM wheels and non OEM tyres...in all probability :thumbsup:

Therefore for an armchair diagnosis without any detailed information from the patient you would assume that it is NOT a tyre/wheel issue based on it being supplied by bmw :thumbsup:

Therefore the fault, if it is a fault, must, based on probability lie elsewhere... :thumbsup: I

The issue with all BBs is that people leap in, shoot from the hip without reading the original post properly or follow the chain before replying... :thumbsdown:

Yes i’ve done it too.. :headbang:
 
Probocop said:
I also think it's the ABS sensor. I had the same symptoms on my old E81 1 series. It progressed into the DSC flashing when turning (left or right depending on which sensor was bust)
Click to expand...

Finally someone with some common sense...
 

I think the basic premise is, (as implied by R.E92), to always check the easiest things first and discount them before diving into complicated, potentially expensive stuff.
Will only take 5 minutes to note the tyre sizes, stick them on the forum and get an answer.
[/quote]

I think we all agree that fault diagnosis, especially armchair diagnosis is that it’s based on probabilities... :thumbsup:

Therefore a new 3 month old owner of a car bought from a main stream bmw dealer under a full warranty will NOT be supplied with non OEM wheels and non OEM tyres...in all probability :thumbsup:

Therefore for an armchair diagnosis without any detailed information from the patient you would assume that it is NOT a tyre/wheel issue based on it being supplied by bmw :thumbsup:

Therefore the fault, if it is a fault, must, based on probability lie elsewhere... :thumbsup: I

The issue with all BBs is that people leap in, shoot from the hip without reading the original post properly or follow the chain before replying... :thumbsdown:

Yes i’ve done it too.. :headbang:
[/quote]

Errr? So....are we violently agreeing :?
 
jamie_z4 said:
It's more than likely the reluctor ring on the driveshaft. It's very well documented online and YouTube guides how to fix it, it's where the driveshaft rusts and bulges out the abs ring and it touches the sensor. It's happened to two of my z4s and is fixed by fitting new reluctor rings and new abs sensors if it's damaged them.

No need to disable a vital safety function which bmw provided in the first place, just get it fixed.
Click to expand...

It's exactly that. Dropped it into Sytners this morning and they've just called me to say that's the issue. Apparently as it's corrosion it isn't covered under the 1 year warranty I got when buying the car...fun. (I only bought the car 3 months ago.) They said they're trying to contact BMW to get it done as a goodwill gesture, so fingers crossed.

The mechanic I spoke to said the corrosion was quite bad, and implied that it may have been there even before I bought the car from them, so kinda concerning that they didn't pick that up when they do their multi-point checks? She says it's not safe to drive.

If BMW don't budge, any idea of how much I'll have to part with to sort the issue out?
 
They authorised the goodwill gesture...thank god. She told me both drive shafts are dangerously rusted and they won't let me have the car back until it's all fixed. Otherwise it would have been £2k to fix. The driveshafts are on backorder so won't have the car back until Friday or early next week. As I'm so young they can't get me a courtesy car either so have to rely on mother dearest for her taxi services...for the whole week :headbang: But hey, at least there is an actual issue and I wasn't just being a drama queen :roll:
 
Felixlamb said:
jamie_z4 said:
It's more than likely the reluctor ring on the driveshaft. It's very well documented online and YouTube guides how to fix it, it's where the driveshaft rusts and bulges out the abs ring and it touches the sensor. It's happened to two of my z4s and is fixed by fitting new reluctor rings and new abs sensors if it's damaged them.

No need to disable a vital safety function which bmw provided in the first place, just get it fixed.
Click to expand...

It's exactly that. Dropped it into Sytners this morning and they've just called me to say that's the issue. Apparently as it's corrosion it isn't covered under the 1 year warranty I got when buying the car...fun. (I only bought the car 3 months ago.) They said they're trying to contact BMW to get it done as a goodwill gesture, so fingers crossed.

The mechanic I spoke to said the corrosion was quite bad, and implied that it may have been there even before I bought the car from them, so kinda concerning that they didn't pick that up when they do their multi-point checks? She says it's not safe to drive.

If BMW don't budge, any idea of how much I'll have to part with to sort the issue out?
Click to expand...

Sounds like they’re trying to body swerve paying for the issue, surely this comes under the “fit for purpose” consumer protection laws? :?
Rob
 
jamie_z4 said:
Oh wouod you look at that, all the know it alls ignoring my post, not like I've fixed 3 of them this year already :P
Click to expand...

Have you got any pictures of said corrosion / damage pls?
 
jamie_z4 said:
Oh wouod you look at that, all the know it alls ignoring my post, not like I've fixed 3 of them this year already :P
Click to expand...

To be fair, my suggestion was merely that, as it takes less than a minute to quickly check the tyres, why would you not?
Not a 'know it all' just a lazy git :wink:
 
jamie_z4 said:
Here's a link to a 3 series but it's the same thing

https://youtu.be/1PdnFRMMnEQ
Click to expand...

Great most informative..the only issue I find on you tube is some of the repairs seem dumb/plain wrong, others are very good...separating them I think you can only do by watching several and seeing what the majority work out...

Despite watching several not been able to fix my slightly wobbly pax door mirror..
 
Pbondar said:
jamie_z4 said:
Here's a link to a 3 series but it's the same thing

https://youtu.be/1PdnFRMMnEQ
Click to expand...
Despite watching several not been able to fix my slightly wobbly pax door mirror..
Click to expand...

Oh that's easy!
Move to Norfolk. You'll never need to use mirrors again.........................or indicators :D
 
You must log in or register to reply here.
Back
Top Bottom