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Message: <blockquote data-quote="Dave70968" data-source="post: 3101686" data-attributes="member: 13624">In airplanes, we do it a little differently: I have a mixture knob right next to the throttle knob, and can adjust it as I see fit (often, but not always, in conjunction with an exhaust gas temperature gauge); matter of fact, when we shut down, we typically do it by pulling the mixture to idle cut-off rather than by shutting down the spark (keeps the plugs cleaner, and our spark is entirely separate from the rest of the electrical system in most airplanes; also, we're still running magnetos).  It sounds like you've solved the altitude problem in large degree, and I don't see myself going up high in the mountains anyway, but is there any way to add even a limited mixture control to an automotive carburetor?<img src="https://cdn.instructables.com/F6D/8RL1/IM0TG3NC/F6D8RL1IM0TG3NC.LARGE.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Big black knob is throttle (at idle), red knob is mixture (at cut-off); small black knob is carburetor heat (turned off), drawing intake air from a muff around the exhaust stack to avoid (or remove) carburetor ice.  Can also be a problem in cars--my dad had a situation once in a '84 Ram with the 225 slant-6 where conditions were just right for carb icing.  Engine started running very rough, but cleared up after he pulled over and the residual heat cleared out the carb.  He later discovered that there was an intake hose set to provide permanent carb heat (by pulling some intake air from around the exhaust manifold) that was missing.</blockquote>

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