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'81 240 faile emissions--barely. 200 1981

uid 24778's pic
posted by  khanawalt on  Tue May 11 15:31 CST 2004
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last visit: Thu Dec 6 21:03 CST 2007
[RELATED]

The max CO is 1.5, I think PPM. My 240 went to 1.96 at idle, burned clean at
2500 rpm.

The emissions sheet said that a rich idle mixture causes this. Could a vacuum
leak make it rich? I thought a leak would make it a little leaner, if the leak
was after the throttle plate.

Maybe I should just set my idle a little higher. I can't get my idle
adjustment screw to slow the idle down below 1000 rpm or so, and maybe that
means there is a vacuum leak somewhere. What are the common vacuum leak
points?






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