I'm trying to troubleshoot why at altitude (4,500'), running LOP (60% power), my #3 CHT is running so much cooler (~75 degrees cooler) than the other cylinders, but at 1-2,000' they're all even. And if I run the fuel ROP, at 4k, the CHTs all stack up nicely. It only happens during LOP, >4k'.

I did a mag-check (dual Lightspeed Electronic Ignition) at altitude and both sides ran fine, and non of the cylinder EGTs temps fell.

Does it have something to do with the carburetor? Any suggestions?


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