Fuel System Issue? Check Density Altitude

The mixture seems either too rich or too lean during climbout. Is there a fuel metering problem or is it a normal variation with density altitude?

By
Rick Durden
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Published:
AVStar fuel systems for Lycoming engines—the top two are fuel injection servos, the bottom two are carburetors. The carburetors are machined from billets rather than cast—as was the practice for decades—making them stronger, with no porosity issues, allowing more accurate fuel metering.
It starts innocently enough—in your fixed-pitch prop single, climbing out on a warm, but not hot, summer day, the VSI points to a number even lower than the usual lethargic rate. Or, on a cold morni…
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