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Old 06-04-2012, 08:36 PM   #34
MJLavelle
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Join Date: Jul 2011
Location: Charlotte NC
Posts: 2,753
My Ride: 2001 BMW 330ci
So much for the "concentrate on the single cylinder" theory. It just goes to show, you can not make any assumptions with cars, and with e46's in particular. When I replaced my fuel filter last month, I had no idea that it would fix the idle issues I have had since I bought the car, but it did! I know people who have replaced every part imaginable to fix their idle issues, with no luck. And I go and fix mine without even trying.
As for your car, I would guess that the computer has a certain threshold for the number of misfires it will ignore, and that threshold is 5. It then reports a misfire in cylinder 5.
You are not the first person that has mentioned a cylinder 5 misfire problem. As I said in one of my earlier posts, I was trying to help a guy several months ago with the same error. I went back and looked, and he had not tried changing his DISA. He has dropped off from the forum, but I sent him a PM, and told him about your solution.
I'm glad you got it resolved, without spending too much money.
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