E90 320i engine randomly hard to start...

[Wayne9888]

My E90 320i having randomly engine hard to start up, not always happen, no any fault code and I already changed all parts is possible make this happen included Fuel pump etc.. But problem still there, a lot BMW specialist was confused, any Bro here having same problem before or any advice?

 

[hapro]

Battery?

 

[Wayne9888]

My battery is new

 

[29ers]

Try changing starter. Recently changed mine was thinking battery weak too but on brining the car to the workshop the sifu said its the starter. After changing...when u push to start the car jumps alive in a split second.

 

[Wayne9888]

Starter changed also

 

[DanzE90]

crank sensor?

 

[Wayne9888]

Crank Sensor changed

 

[gendong]

any other symptoms like having to top up coolant or engine oil?

 

[Wayne9888]

No at all

 

[azeL_Inc]

Does it always cranks bro?

 

[Wayne9888]

Not always

 

[Foxy]

I'm guessing you're running the N46 engine? You may want to take a look at your electronic fuel pump.

I'm not too familiar with your model in all honesty, but in our N54 engines the common symptoms of a failing HPFP (High

Pressure Fuel Pump) are long cranks and difficulty turning over especially during cold starts.

 

[anaksarawak]

Can you list what you have done? So it be easier for us to assist you.

I suspect the solenoids next to the crank sensor is giving you that issue or some thing related to the this https://www.youtube.com/watch?v=qZ9k4Ohssu8

Took me almost 3 months to hunt down the same issue and finally found it is because of old electronics.