Engine won't start

[Z3Mroadster]

I was disconnect ECU,solenoids,cam and crank sensor and when plug in engine won't start...
I don't disconnect the battery..

Engine is S50...

What is potential problem?


Thanks!

 

[Pingu]

Most likely that one of the sensors has not been connected properly.

The best way to find out is a code reader. INPA would show the error code for the disconnected plug.

 

[mrscalex]

Is the engine trying to crank? If not it’s most likely an EWS to DME rolling code issue and it would need a resync in INPA.

If the car is cranking it’s not EWS related. And as suggested you should check the error codes.

In the absence of related error codes you may have disturbed an already detriorated vacuum connection and opened up a hole. I’d start with the MAF and throttle hoses.