PCV VALVE REPLACEMENT BMW E90 N46 ENGINE PLUS NON START 

Thanks for taking the time to help - I’ve actually sorted it now (see next video if you’re interested)!

Thanks - if ECU doesn’t fix it I will do this

Thanks for this. I think you’re on the mark with the ECU - it’s currently off for repair but they’ve opened it up to find water damage so I’m getting a new one!

@@DaveReevesVXR unfortunately e90 has much weaker ecu box than e46. Will you get a ecu, immobiliser and key set ?

They tell me they will be able to program the new ECU and it will plug and play! We shall see…

@@DaveReevesVXRhey Dave - do post an update to hear on progress/resolution- I’m also experiencing crank no start with no tach reading while cranking and have changed crankshaft sensor -thx

I’m working on the solution and next video - hoping to upload in the next few days - should be before Wednesday!

I’ve currently can’t communicate with the engine ECU. I have since used ISTA and can communicate with other computers in the car and various codes re lack of comms with engine ECU… so ECU is currently where my focus lies!

@@DaveReevesVXR I had my ECU throwing wobblies Dave it was simply due to rain water getting into the housing. I too threw money on sensors etc etc. Not sure if this is a E90 thing.

Thanks that’s useful to know! ecutesting.com lists common faults and one where my symptoms are consistent with E90 ECU failure so here’s hoping 🤞🏼

How many miles ?is it smoking badly? if so valve stem seals will definately need changing,did mine last year.

104k miles. It doesn’t smoke badly, I’ve never noticed any myself but it has been commented on when someone was following me a few months back. If the PCV value doesn’t cure the oil consumption then value seals will be my next attack I think.

What’s the code description? A quick Google suggests the codes relate to the MAF but my experience with the E90 has taught me that some codes are manufacture specific so may not be MAF related.

@@DaveReevesVXR , tnx indeed. I cheched MAF and with new Replaced it.. codes still alive. ( air system gone to sniffing I think )

So you are confident the code relates to MAF? Possible vacuum or intake leak? Issue with PCV valve? O2 sensors?

Thanks - me too!

Hi Dave. I experienced the same issue a week ago. I initially thought it was the ABS sensors or something related but a mechanic confirmed those errors wouldnt prevent the car from starting. Eventually I removed the ECU cover and there was water at bottom of ECU box. Dismantled the ECU and water was inside ECU as well as corrosion on ICS and components. I purchased replacement ECU and car started right up. Water got into the box as the windscreen bottom trim wasn't installed correctly a few weeks ago by Windscreen glass replacement company in Durban and hence water wasn't channeled away from ECU box. Hope this helps. Cheers

Hey - thanks for taking the time to write that. It’s very helpful and you are spot on! I’m hoping to get the next video on this out later tonight…

If it’s not the ECU that will be one of the next things to look at for sure