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The choke function -- delivering a richer mixture while running cold -- is handled by the cylinder head & intake air temp sensors telling the ecu that it's cold, so that the ecu can lengthen the duration of the injector pulses. <-- Awesome info!!! Much thanks! Thanks to all for the great responses - I will follow the troubleshooting steps and find this air intake sensor and see if I can find a replacement. PD > > (If I have any of this dead wrong, let me know, as it's the model > I'm using in my own head...) > > The cold start valve is more akin to, on a carbed car, the driver > pushing the gas pedal to the floor & releasing it in order to dump a > squirt of raw gas from the accel pump. (Of course, on a carbed car, this > also lets the fast idle cam and choke deploy into their "cold" positions.) > > The choke function -- delivering a richer mixture while running > cold -- is handled by the cylinder head & intake air temp sensors telling > the ecu that it's cold, so that the ecu can lengthen the duration of the > injector pulses. > > The aux. air regulator pretty much does the job of a carb's fast > idle cam. > > -Greg > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org >