Ok, I've done some more troubleshooting on my engine misfire on my 540. I'll try to lay out what I know so far.
About two months ago I got a flashing CEL light that turned solid after about 15 seconds. I pulled the codes and got the random/multiple misfire code and also codes for two separate cylinders. I originally thought it was cylinder 1 and 6. Looking at my notes, I now believe that it was originally 1 and 5. This is important because at one point I switched coils between 5 and 6, and I thought the misfire moved, but in reality I think it was always on cylinder 5 and it did not move.
I did some troubleshooting with regards to switching coils and boots with no result (I now believe, see above). I also repaired what appeared to be a vacuum leak. There was no change. Except that the cylinder 1 misfire vanished, and has not returned.
When the car is cold, it drives very well, it takes abut 15-20 minutes of driving before it starts missing again. I discovered that if I drove the car carefully, without lugging it too much or putting much load on the engine, I could make my entire 30 minute commute, and then 8 hours later I could drive home, and have no missing/no codes. It was pretty cold out during this time, and I now think that has a lot to do with it.
So I drove it carefully for a while with no missing. When the coils I ordered came in, I took it for a drive to try to get it to start missing, and had no luck. It ran perfectly, and has for the last few weeks. It has been cold.
Last week it started missing again. THIS TIME, I get the random/multiple misfire code, and a code for cylinder 2, which I have never had before. Cylinder 1, 5 and 6 are all fine. I am not sure what the outside temp was, as I had not made the connection at that time that the temperature had a direct impact on my misfire. The nest day was cold, and it ran fine to and from work. The next day was warm, and it started missing 15 minutes into my drive.
I switched coil and boot around today, and the miss did not follow. I also disconnected the MAF, with no change. I also went around the engine bay with an open unlit propane torch, with no result.
I pulled the plug for cylinder 2, and it looks like this:
So where do I go from here? I have read the O2 sensors and CPS sensors can cause a misfire when warm. And it certainly feels like it could be happening when the pipes get hot. But that doesn't really explain the misfire across banks (indicates vacuum leak possibly), and I get no codes with my peake for either of those items. Can they fail without a code?
Here is my original thread: http://ift.tt/1wUQrX2
Thanks for any help!
Also: different subject, but at one point today, my heater valve/secondary water pump (one unit, correct?) was emmitting a pretty loud humming noise and vibrating, after I had turned the car off. this continued for several minutes until I turned the key to position 2. It did not reappear that I noticed. Problem?
About two months ago I got a flashing CEL light that turned solid after about 15 seconds. I pulled the codes and got the random/multiple misfire code and also codes for two separate cylinders. I originally thought it was cylinder 1 and 6. Looking at my notes, I now believe that it was originally 1 and 5. This is important because at one point I switched coils between 5 and 6, and I thought the misfire moved, but in reality I think it was always on cylinder 5 and it did not move.
I did some troubleshooting with regards to switching coils and boots with no result (I now believe, see above). I also repaired what appeared to be a vacuum leak. There was no change. Except that the cylinder 1 misfire vanished, and has not returned.
When the car is cold, it drives very well, it takes abut 15-20 minutes of driving before it starts missing again. I discovered that if I drove the car carefully, without lugging it too much or putting much load on the engine, I could make my entire 30 minute commute, and then 8 hours later I could drive home, and have no missing/no codes. It was pretty cold out during this time, and I now think that has a lot to do with it.
So I drove it carefully for a while with no missing. When the coils I ordered came in, I took it for a drive to try to get it to start missing, and had no luck. It ran perfectly, and has for the last few weeks. It has been cold.
Last week it started missing again. THIS TIME, I get the random/multiple misfire code, and a code for cylinder 2, which I have never had before. Cylinder 1, 5 and 6 are all fine. I am not sure what the outside temp was, as I had not made the connection at that time that the temperature had a direct impact on my misfire. The nest day was cold, and it ran fine to and from work. The next day was warm, and it started missing 15 minutes into my drive.
I switched coil and boot around today, and the miss did not follow. I also disconnected the MAF, with no change. I also went around the engine bay with an open unlit propane torch, with no result.
I pulled the plug for cylinder 2, and it looks like this:
So where do I go from here? I have read the O2 sensors and CPS sensors can cause a misfire when warm. And it certainly feels like it could be happening when the pipes get hot. But that doesn't really explain the misfire across banks (indicates vacuum leak possibly), and I get no codes with my peake for either of those items. Can they fail without a code?
Here is my original thread: http://ift.tt/1wUQrX2
Thanks for any help!
Also: different subject, but at one point today, my heater valve/secondary water pump (one unit, correct?) was emmitting a pretty loud humming noise and vibrating, after I had turned the car off. this continued for several minutes until I turned the key to position 2. It did not reappear that I noticed. Problem?
540i multiple misfire when warmed up, runs well when cold, UPDATE THREAD.
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