Hi.. i have 98 Z3 1.9L... when i start the car is has a misfire were the RPMS drop down to 500 and jump up, if i go up to 4000 rpms the car will turn off and i have a hard time turning on the car. i have to pump the gas to it would turn on again.. i have replace the coil pack because number was not working..

__________________
This post was auto-generated based upon a question asked on our tech article page here: BMW E36 3-Series Oxygen Sensor - O2 Sensor - Replacement (1992 - 1999) | Pelican Parts DIY Maintenance Article

You're going to have to determine the cause of the misfire. I would check spark, fuel and compression on all cylinders.


- Nick

Maybe a vacuum leak somewhere? Did you plug in and pull any codes that may be present in the DME? What cylinder is misfiring? Did you try moving the spark plug into a different one to see if it follows?

http://www.pelicanparts.com/BMW/techarticles/BMW-Z3/57-ENGINE-Spark_Plug_Ignition_Wire_Coil_Replacement/57-ENGINE-Spark_Plug_Ignition_Wire_Coil_Replacement.htm