Dennis zhang
Member
Engine misfire is a very common problem across the E90 range fitted with engine ECU. The vehicle will begin to run rough and develop an engine misfire over one or more cylinders and will often get progressively worse over time.
When diagnosing the problem using scan tools you will find fault codes for injector circuit failure and/or combustion misfire, you will also notice missing injector signals from the ECU.
If left untreated the faulty ECU will become the cause of the BMW E90 not starting and communications to the engine management system may become impossible.
Common Failure symptoms:
Engine misfire
No injector signal
Runs rough
No start
Engine management light illuminated
When diagnosing the problem using scan tools you will find fault codes for injector circuit failure and/or combustion misfire, you will also notice missing injector signals from the ECU.
If left untreated the faulty ECU will become the cause of the BMW E90 not starting and communications to the engine management system may become impossible.
Common Failure symptoms:
Engine misfire
No injector signal
Runs rough
No start
Engine management light illuminated
