First BMW, let alone M3 and nothing but trouble! 😤

[Dave07997S]

Get a hold of Mike with BPM, he can help.

[M3Richard]

Originally Posted by Dave07997S

Get a hold of Mike with BPM, he can help.

Thanks for your reply, quick Google and I've come up with http://www.bpmsport.com/about

Is this the outfit you're referring too? Seems to be US company, I'm in Northern Ireland.

[Dave07997S]

Originally Posted by M3Richard

Thanks for your reply, quick Google and I've come up with http://www.bpmsport.com/about

Is this the outfit you're referring too? Seems to be US company, I'm in Northern Ireland.

Have you tried giving Evolve a call there in Great Britain

[bmwpower603]

What kind of scan tool have you used on it?

Get it on ISTA if you haven’t already.

I’m willing to bet there’s throttle actuator codes on both banks. I go to a lot of dealer auctions. And every time I see an m3 I put ISTA on it for shits and giggles.

I’ve seen a few with every cylinder misfiring. (And it usually has both throttle actuator codes to go with it)

[LakeSurfer]

I'm nothing close to an expert nor do I try to be, however, if the problem is not the ECU or the DME my guess is the problem could very likely point to the primary O2 sensor.

Just a thought

-Mark

[M3Richard]

A bit of a non-update here...

I have since had the ecu and throttle actuators sent for testing with ecu testing. They were unable to test the ecu, stating that it was to complicated to decode (or words to that effect).
They have tested the actuators and both have come back as no faults. They've said as it's intermittent it may still be the problem and can rebuild. This would be £498 in total.
From turning the actuators by hand before posting it was clear that one moved much more freely than the other, which was 'sticky'.

I now have the dilemma of whether or not to gamble 500 quid on something that might not even fix it. Considering there has never been any throttle related fault codes i am at a loss.

Any thoughts?


A mere Chipper
I should add that prior to removal and sending for testing. My mechanic was able to plug diagnostics in when the car went into limp mode and displaying the same faults again. This showed irregularities in the throttle readings and did not match what was shown on the revometer or at the pedal. Both of wish were reacting as normal. Throttle readings were much much lower (if that makes sense).

[Redd]

Originally Posted by M3Richard

A bit of a non-update here...

I have since had the ecu and throttle actuators sent for testing with ecu testing. They were unable to test the ecu, stating that it was to complicated to decode (or words to that effect).
They have tested the actuators and both have come back as no faults. They've said as it's intermittent it may still be the problem and can rebuild. This would be £498 in total.
From turning the actuators by hand before posting it was clear that one moved much more freely than the other, which was 'sticky'.

I now have the dilemma of whether or not to gamble 500 quid on something that might not even fix it. Considering there has never been any throttle related fault codes i am at a loss.

Any thoughts?


A mere Chipper
I should add that prior to removal and sending for testing. My mechanic was able to plug diagnostics in when the car went into limp mode and displaying the same faults again. This showed irregularities in the throttle readings and did not match what was shown on the revometer or at the pedal. Both of wish were reacting as normal. Throttle readings were much much lower (if that makes sense).

What codes were read? Sounds like throttle actuators.

[akkando]

I mean you're going to have to do TAs at some point anyway on 75k Mike car unless they were recently done by previous owner.

[M3Richard]

Originally Posted by akkando

I mean you're going to have to do TAs at some point anyway on 75k Mike car unless they were recently done by previous owner.

This is the thing, looking at the history it says they have been with ecu tuning in 2015 or 2016. The units also have warranty stickers on them. This is my main concern for using them done again.

[M3Richard]

Originally Posted by Redd

What codes were read? Sounds like throttle actuators.

The only faults found have been listed in first post. None refer directly to TAs

[kyrix1st]

One reason why some OEM parts cost twice as much as the OEs are that they pre-test the parts before stamping BMW logo.
You can particularly see that from OEM engine mounts rarely failing within two years while OEs being a hit or miss.

[Helmsman]

Originally Posted by M3Richard

The only faults found have been listed in first post. None refer directly to TAs

Sounds like bummer Richard. To rule the TAs completely out maybe worth t reach out to Jason at Rebuild UK (https://www.rebuild.org.uk). These guys' business is obviously to sell refurbished TA rather then field support but they seem like nice guys so maybe nurse a tad on their experience....?

Also believe Ive read about some ECU issues getting sorted on M3Cutters. Looked around there as well?