M4 2100k Miles Spun Crank Hub?

[PacificBimmer]

Originally Posted by FriedPiston

Definitely seems like it, but this dealer may not be familiar with what SCH is.

I explicitly told them about SCH before I brought it in, and asked them to check it. They used a tool to check crank bolts which they said were fine. I asked them if CH was fine (not spun) and they said yes..

[FriedPiston]

Originally Posted by PacificBimmer

I explicitly told them about SCH before I brought it in, and asked them to check it. They used a tool to check crank bolts which they said were fine. I asked them if CH was fine (not spun) and they said yes..

Read the tech notes and refer to the diagrams below. Then see if there's a way for timing to be off by 180 degrees without involving the crank hub.

https://www.realoem.com/bmw/enUS/sho...diagId=11_5626

https://www.realoem.com/bmw/enUS/sho...diagId=11_5597

[n8dgr84]

I added 14L E85 from Co-Op at 248th yesterday to get a full tank with Shell 91 and it seems to run way smoother, even at part throttle. Might be something to try when you get this figured out.

[PacificBimmer]

UPDATE: FIXED!! So happy. As I suspected it was a vacuum leak, I checked everything over of course except for the last part which I checked today - the BMS J-Pipe cold charge. I noticed a hose clamp was a bit loose so I went to tighten it and it kept tightening didn't seem right wouldn't lock down.. opened the bay up and noticed that the boot came completely off the J-Pipe, not sure what happened but it was just resting on top (tight in there so it looked connected). Tightened it all down really good and the car is running beast now. CEL also automatically went off.

Next question is if this was loose before, would running WOT on Map 2 cause the major timing shift I experienced?

[mark5092]

Glad it’s fixed and all is well! Enjoy! At least it was another SCH false alarm!

[PacificBimmer]

Originally Posted by n8dgr84

I added 14L E85 from Co-Op at 248th yesterday to get a full tank with Shell 91 and it seems to run way smoother, even at part throttle. Might be something to try when you get this figured out.

Yeah the question here in BC is always Shell 91 V-Power or Chevron 94, or some mix -- interesting way to mix.. have you done that before?

[n8dgr84]

Originally Posted by PacificBimmer

Yeah the question here in BC is always Shell 91 V-Power or Chevron 94, or some mix -- interesting way to mix.. have you done that before?

No, first time.
I watched VanCity Audi guy on youtube do it on an S4 to eliminate knock retard so I figured why not.

I suppose I could log any ignition correction on bootmod3 to compare the different fuels but I know what I feel and it feels good!

[PacificBimmer]

Originally Posted by mark5092

Glad it's fixed and all is well! Enjoy! At least it was another SCH false alarm!

Yeah thanks. Not sure what to do about CH .. I asked the dealer and they said no keep it stock. if it spins they will cover through warranty if lock put in place they wont.. sigh.

[PacificBimmer]

Originally Posted by n8dgr84

No, first time.
I watched VanCity Audi guy on youtube do it on an S4 to eliminate knock retard so I figured why not.

I suppose I could log any ignition correction on bootmod3 to compare the different fuels but I know what I feel and it feels good!

Nice video. Did you just use a precanned amount of E85 like 4 liters to an almost full tank?

[maddmatth]

Originally Posted by PacificBimmer

Yeah thanks. Not sure what to do about CH .. I asked the dealer and they said no keep it stock. if it spins they will cover through warranty if lock put in place they wont.. sigh.

Well that's the price of modding cars, warranty and easy reliability goes out the window!
Maybe you should try to enjoy the car the way it is

I heavily modified my 335i. There was a lot of fun but a lot of expenses and headaches along the way. For my M4 I'm trying to keep stock and just enjoy driving it without constantly looking for things to improve.

[PacificBimmer]

Originally Posted by maddmatth

Well that's the price of modding cars, warranty and easy reliability goes out the window!
Maybe you should try to enjoy the car the way it is

I heavily modified my 335i. There was a lot of fun but a lot of expenses and headaches along the way. For my M4 I'm trying to keep stock and just enjoy driving it without constantly looking for things to improve.

Yeah true! I think I am past the point of no return now hahaha.. that's how she goes. FWIW i also heavily modded my 235 and 135i's without too many issues was just the high pressure fuel pumps mostly. But that was N54 and not S55 .. diff beast.