Just wondering if anyone has had/is having similar issues. The engine misfires in a very specific situation, namely after coasting (engine breaking) when applying throttle again, particularly at the lower end of the rev range, the engine misfires. Once at higher RPM 2000+ it behaves normally. My suspicion is a faulty injector, as opposed to a faulty coil pack. A faulty coil pack I believe would cause a misfire throughout the rev range.

Any ideas how to verify the cause?

Would new injectors need to be calibrated? or are they just interchangeable?

Morning Kingair

Welcome to the Forum

A diagnostic read with Inpa/Ista ( or a BMW capable Diagnostic program) would confirm exactly what is happening.

If you don't have access I would first check the loom and connections if all are good and you are actually changing a single injector I believe it wili need registering through Inpa/Ista or similar

Dave 

Thanks Greydog.

Afraid the real cause, as I have just discovered, is due to damaged wiring...as you suggested, but probably not the type of damage.  I found evidence of a rodents nest!! The insulation has been partially stripped (eaten).

Hoping it is limited to what I can see.

Rgds

Nigel.

I have seen that before little blighters climb in where it is warm. Good find,if it isn't repairable use www.realoem.com to get the correct part numbers then Google to find replacements 

Dave

Thanks for the tip re. OEM part numbers Dave.

 

cheers 

Nigel