[urq] Engine Warmup Operation

[Buchholz, Steven]

... all the air that passes through the Aux Air Regulator is metered ... it doesn't matter how wide open it is or it is closed, the mixture will be the same ... the only thing that changes is the amount of air that is allowed to flow into the engine, and thus the idle speed.  The only thing deliberately affecting the mixture outside the fuel distributor (and its associated bits) is the cold start valve on the intake manifold. 

Steve B
San José, CA (SUA)
> 
> 	Over the balmy weekend I removed the aux air valve to check the cold
> vs hot positions of the internal sliding valve. Seems that after cooling
> down the valve in the freezer to simulate a cold start air flow was
> restricted and probably resulted in a very rich mixture. Adjusted the pivot
> pin to allow more air flow & reinstalled back on the engine. Next morning
> the car idled nicely @ ~1000 RPM and seemed to behave OK on light loads.