Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Idle Speed: Adjustments
Fast Idle Speed
Federal
FAST IDLE SPEED ADJUSTMENT
1. Place the transmission in Neutral or Park.
2. Bring engine to normal operating temperature (upper radiator hose hot).
3. Disconnect the vacuum hose at the EGR valve and plug.
4. Disconnect the vacuum hose at the purge valve and plug.
5. Place the fast idle screw on the second step of the fast idle cam. Adjust fast idle speed to specification. See: Specifications
6. Remove plug from EGR valve hose and reconnect.
7. Remove plug from purge valve vacuum hose and reconnect.
California
FAST IDLE SPEED ADJUSTMENT
1. Place the transmission in Neutral or Park.
2. Bring engine to normal operating temperature (upper radiator hose hot).
3. Disconnect the vacuum hose at the EGR valve and plug.
4. Disconnect the vacuum hose at the purge valve and plug.
5. Disconnect vacuum hose from cold start vacuum switch (orange vacuum switch on rocker cover) and plug hose. Using a slave vacuum hose
connect manifold vacuum to cold start vacuum switch.
