Idle control

Aug 15, 2010 update on ditchdigger's 1971 Fiat 850 Berlina

Unfortunately the coolant operated idle booster on the quad throttle body doesnt quite seem to work. So I whipped up a new throttle plate bypass. The brass screw in the side and the 3/16” hose barb is base idle speed and the large 1/2” port will go to a bosch aux idle valve from a CIS VW to handle cold idle duties.


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