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Next Problem... Lumpy Idle?

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    Next Problem... Lumpy Idle?

    Now that I have everything in place it's all good except when the car is idling the idle is kind of lumpy. It sounds like it has a performance cam but I'm 100% positive it does not. When I rev it up it sounds just fine until it returns to idle.

    When I pulled connector to the MAF it idles nice and smooth and revs nice but it throw a CEL. When I plug it back in it starts the lumpy idle BS again. I tested with another known good non-vanos MAF and got the same results so now I know it's not the MAF either.

    Is there anything else that might cause a M50 to idle like this?

    #2
    Fixt, turned out to be a vacuum leak on the ICV -> Intake Hose.

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      #3
      Originally posted by RobertK View Post
      Fixt, turned out to be a vacuum leak on the ICV -> Intake Hose.
      good you fixed it. I was going to remind you that nvm50s have kinda lumpy cams anyway...
      1989 cirrisblau-metallic 325i

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