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  #11  
Old 07-20-2021, 11:25 AM
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Quote:
Originally Posted by crystalworks View Post
Much appreciated. Most of us here don't go by "P" codes anymore but use the more specific BMW codes that more capable code readers pull out of the modules.
Thanks, I only wish I had more specific BMW code reader. Bought the IMPA disc, but have yet to find an old XP laptop to install it on. Live and learn, will be more specific in the future.
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  #12  
Old 07-20-2021, 11:31 AM
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Misfire and Injector Circuit Open Issues 2,3,4 cylinders

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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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  #13  
Old 07-20-2021, 12:54 PM
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Quote:
Originally Posted by X5chemist View Post
An experienced mechanic knows those code by heart.
I absolutely agree any pro mechanic working on many brands would.should know them by heart. My exception those who, like me (and probably many of any BMW forums members) who are not pros, only work on BMWs, and were forced to buy a BMW specific tool a long time ago. So P codes haven't been seen in a LONG time (at least 10 years and as many BMWs in my case).

Sorry OP for the slight OT. But your misfire situation is definitely one all of us have gone through at some point on a BMW. It's usually vacuum related but at times can be ignition system (least probably in my experience is fuel supply). If you have access, your short term and long term fuel trim data would be helpful with diagnose by some of the more technically minded members.

When I have misfires, especially at certain mileages, I tend to take the shotgun approach to it and replace all coils/plugs, vacuum lines, crank case breather components, valve cover gaskets, etc, etc. It usually costs more (sometimes a lot more) but saves time on diagnosis and "resets" the clock for another ~100k miles before I'll need to worry about misfires again.
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  #14  
Old 07-20-2021, 06:34 PM
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MISFIRES and INJECTOR CIRCUIT ISSUES

Thanks, I will start checking for the issue, just thought someone would have had exact same issue, not just random misfires, but specific 2.33 and 4 injector circuits. Will check further and post results.
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  #15  
Old 07-20-2021, 07:19 PM
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Multiple misfire codes:

- Air leak, check again and again.

- Bad ignition coil, but usually just 1-2 bad coils.

- Spark Plugs getting old...

- Bad gasoline (contaminated with water).
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