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CEL comes on while coasting

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    CEL comes on while coasting

    Whenever I am coasting in neutral or just sitting at a light, my E30's CEL comes on. It goes away as soon as I give it gas, but anyone know why this is happening?

    #2
    vac leak? Do you have oscillating idle?

    Otherwise, maybe tps? I have no idea when it comes to m20 management, so I'm picking at straws, but your initial description leads me to ask these questions.
    '84 318i M10B18 147- Safari Beige
    NA: 93whp/90ftlbs, MS2E w/ LC, 2-Step
    Turbo: 221whp/214ftlbs, MS3x flex @ 17psi

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      #3
      All of those could be possibilities, it just started happening a week ago, and every once in a while it has a rough idle.

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        #4
        rough idle = vacuum leak

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