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Old 07-20-2021, 11:31 AM
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Misfire and Injector Circuit Open Issues 2,3,4 cylinders

Quote:
Originally Posted by X5chemist View Post
An experienced mechanic knows those code by heart.
Did you pull the plug? I've seen individual plugs fail. You can move the coil pack to another location or ohm it with a voltmeter. Compare ohm reading between coil packs. You can do the same for fuel injectors. One cylinder miss fire will cause other cylinders to misfire even though other cylinders may be okay. The P0303 is where I would look the most for troubleshooting. MAF and air intake leaks are very common causes.
Thanks, have owned a dozen BMW's over the years, and I went by the misfire injector open issue, so ordered an injector seeing that it was specific code, but I will double check coil anyhow while I check further. Given one cylinder misfire can impact others, will check the original #3 injector and replace, but while I have fuel rail off, will check the other injectors to see what the readings are. So thanks again, never had this issue in all the years working on these BMW's.
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