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Anything that causes a misfire will cause the mixture to indicate lean. Remember, it's an Oxygen sensor. If you don't burn the fuel it's got a lot of that being pumped down the exhaust making the instrument think things are Very lean..
Problem may not be fuel related at all.
Tracy
On Tue, May 4, 2010 at 11:46 AM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
After I get the engine running smoothly in a range, it will occasionally
hiccup. When it does, the mixture will then go down sometimes off the
scale, then come back to where it was. I have not noticed any dips in the
MAP table at these locations.
Any ideas, suggestions?
Bill B
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