[alfa] idle adjustment

["John S." <roadtrip999@xxxxxxxxxxx>]

Andy - It sounds as if the reference screw gap is adjusted correctly or your 
Thermostatic Actuatois not fully extending when the engine is hot. That will 
cause the symptoms you describe. As the engine heats up, the little piston 
in the TA extends, pushes on a lever in the injection pump internals, and 
leans the mixture and lowers the idle to normal (about 700 rpm). A quick TA 
check is to heat the car all the way up to operating temperature and 
disconnect the long rod from the injection pump throttle lever on the rear 
of the pump. Measure the distance between the throttle lever and the 
reference screw (the thing with the little plastic anti-tamper cap safety 
wired to the pump. The gap with the engine hot should be .019" OR LESS. With 
a good TA and a hot engine, the gap will often times be zero. If there's a 
big gap, then it's likely the TA is bad or the adjustment screw under the TA 
piston needs to be adjusted.

To do a detailed check on the TA, you need to remove it from the car, and 
heat the bulb end in water to 175 F and measure the piston protrusion. It 
should be 27mm or 29-30 mm depending the the model of the TA.

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