M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
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I think there is some info you don't have. First thing you should know is the exhaust CPS are likely more important than the intake CPS. The exhaust CPS set the volume of EGR the intake only facilitate the transfer.
The other thing you need to know is your misfire is a different misfire than you likely think. During the startup the ignition fires on every rotation of the engine. So once for ignition and then once on the exhaust stroke. That code means that the misfire was on the exhaust stroke. What that means is you have incomplete combustion do to a bad fuel mix. This could be because of fuel but also the wrong volume of exhaust maybe going in which means the air volume is wrong. This is why you make sure the Vanos is correct.
You seem to get the same misfire all of the time, with vanos problems you can see more random misfires but not always. You have changed the coil but not really. You needed to switch 1 with 3. 2 fires right after 1 so is a poor choice for the change. Misfire detection on this car does not always get it right, sometimes it guesses at the wrong cyl. Switching it to 8 would be the best but that is on the other bank, 3 does almost the same thing.
Is the Peake tool giving you a misfire code? The 69 code is significant and if your sensor is at fault then that could play a role in what is going on, but it is rarely the sensor. You should do the diagnosis on that system. There are a lot of threads on the 69 code, no sense in talking about it here unless you run into problems. The 68 does not come up from clearing the codes. I don't think I have ever seen it reported. In fact it is not even listed in table 18, are you sure it is not 6B?
Last edited by Sailor24; 6th October 2015 at 02:39 PM.