SOLVED: 2003 X5, 3.0l, runs rough, reset on restart?

[upallnight]

Originally Posted by cmelkoni

Another question for you: Does the computer only shut the injector down after a certain amount of misfires AND only when the car is stopped? That would make sense from a safety standpoint and would further point to an actual issue in Cylinder #2.

The computer shuts down the injector only after a certain number of misfires has been recorded. The computer will shut down the injector even if the car is moving. When the injector is shut down, the computer will turn on the service engine light.

The counter is reset when the engine is turned off. The service engine soon light may go off when the engine is shut down and restarted but will come back on when the injector is turn off by the computer.

[cmelkoni]

upallnight,

Thanks for the information. I have never once had the X5 shut off the injector and run rough while driving. Every single time has been at idle. Once in driveway, twice at redlights, once at store, etc. Is it possible that the coil in cylinder #2 is only misfiring at low RPM's and thus hits the counter only when in idle? Have you ever seen this behavior before?

Picking up a new coil in an hour so this post may be moot, but it would still be great information to know.

[upallnight]

Originally Posted by cmelkoni

upallnight,

Thanks for the information. I have never once had the X5 shut off the injector and run rough while driving. Every single time has been at idle. Once in driveway, twice at redlights, once at store, etc. Is it possible that the coil in cylinder #2 is only misfiring at low RPM's and thus hits the counter only when in idle? Have you ever seen this behavior before?

Picking up a new coil in an hour so this post may be moot, but it would still be great information to know.

Did you ever have a SES light come on while you were driving the car? I had a bad coil one time while I was driving the X. The SES light came on. I carry a bluetooth scanner in the car and use an app on my phone to scan the car. It was for a misfire in cylinder number 2. Swap the coil with another cylinder and clear the code. Drove the X for a while and the SES light came on again. Scanned the car again and the misfire moved to cylinder 3. Bought a new coil at the local auto part store and replace the bad coil. Been fine for the past 4 years.

[StephenVA]

Along with many others on the forum we all can toss out ideas of what we think the cause of your intermittant issue= this failed component. However as posted, the only way to see what is going on at this point requires you to tap into to the data stream to read "live"/captured activity as the on-board systems try to compensate for the problem. You can see injectors pulse increase/decrease, secondary ignition activity by cyl, etc, ect. All of this will help you and the collective knowledge of our community provide insight on the point of the issue.
Example: it maybe poor fuel causing an issue with a clean burn in the cylinders, or a bad injector/connection turning off fuel flow to a particular cyl, or even a bad coil/wiring pinched that fails. Who knows...
Everything at this stage with out real info is just a SWAG (Scientific Wild Ass Guess) So, based on that thought, my SWAG guess is TPS/Intake Cam Sensor related.

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