I was driving my e46 m3 earlier and out of nowhere it started misfiring on at least one of the cylinders. I had been driving it for about 30 minutes already before it started misfiring. Check engine light came on same time as misfire. It started right around when I was going up the same hill I always go up on my way home (about a mile long hill not very steep but a slight incline). Once I started going back down the hill it started running normal again and the check engine light went away. I continued to drive it back home (up and down more hills) without any issues, although it did feel like it didn’t have as much power as usual but that could just be in my head. It was a dry sunny day so definitely no water got anywhere. What is happening?
M3baby!
There are no stored codes. I haven’t drove it since and I’m scared to drive it I don’t want to be stranded. Do you think it’s safe to drive? What would cause this?
When the misfire comes back, be ready with your code reader/scanner to read out the fault codes right away. That will give clues toward the cause.
My gut says it is an electrical connection that jiggled loose or something similar. Some types of misfires, such as when the DME cuts fuel to protect the cylinder, automatically clear on the next engine start. Other types vary based on the cause.
It would be quite helpful to look at the basic engine parameters at fully hot idle and share those here for feedback.
My gut says it is an electrical connection that jiggled loose or something similar. Some types of misfires, such as when the DME cuts fuel to protect the cylinder, automatically clear on the next engine start. Other types vary based on the cause.
It would be quite helpful to look at the basic engine parameters at fully hot idle and share those here for feedback.
- RPM
- coolant temperature in Celcius
- MAF value in grams/second
- Short-term fuel trim (STFT) bank 1
- Short-term fuel trim (STFT) bank 2
- Long-term fuel trim (STFT) bank 1
- Long-term fuel trim (STFT) bank 2
So I got to looking under the hood and saw one side of my breather hose that’s on the top of the engine was partially undone. Would that cause the misfire?
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