Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2009 BMW 323i NO START (no fire signal sent to coils) no DTC
Turning to you now since I have no idea what to do anymore. I am a car enthusiast that bought a 323i a year ago that had some work to be done. Only thing not suspension / bushing related that I did was change the valve cover gasket. Since I've changed that, the car won't start.
The car cranks, injectors do get voltage + signals, but the coils do not ever get the fire signal (but they do have a good voltage and a good ground).
Oil pressure switch works, I do have a crank and cam sensor signal at ECM (looked it with my Hantek scope, I do not know if they are correlated like they should though : I had to remove the valvetronic motor, this might have changed the timing causing the no fire situation ?)
I know it's kind of chaotic but please, ask away and I'll be more than happy to help you to help me !
Don't know if this is your problem but do look into it.
When repairs are performed on the Valvetronic assembly the limit stops have to be relearned. You will need access to a BMW scan tool to do this procedure. The limit stops are the mechanical limit stop, end to end of rotation of the eccentric shaft. The DME (digital motor electronics) records these stops via the eccentric shaft sensor to determine mechanical adjustment limits of the eccentric shaft. With that said, when removing the motor to replace the gasket you are not changing the mechanical position of any Valvetronic assembly components, a relearn is not always needed. Now use this with caution and when in doubt, perform the relearn. Do you research and check with up to date repair information before beginning
