Yup M3 and Z4M have different DME's though exactly the same engine.nichollsz4 wrote: ↑Mon Sep 04, 2017 2:07 pm My thoughts on possible culprits...
- Coil Pack/s
- Throttle Position Sensor (one of)
- Mass Air Flow
- Poor Remap
- Tired Throttle actuator
Knowing my luck, its gong to be the latter of the list as its most costly to put right but does anyone have any other thoughts?
I would personally try TPS first, but not going to give that as solid advice as it's you're money and it could be something completely different!
If you get BMW (INPA) diagnostics on it, might be worth a try. You can find out a fair bit by just looking at the values for the various engine component's. Plus it might be storing codes in INPA but just not throwing an EML light yet, seen this a few times, maybe not but might give a clue.
I would also add pre cat o2 sensor's to you're list. Again should throw an EML if failed / failing but not necessarily, but a well known part to fail due to their location.
Might be worth biting the bullet and getting it to a decent indy, as you can see with that list, the cost's can easily escalate if you start replacing part's first without proper diagnosis.