E 250 Van L6-300 4.9L (1984)
Idle Speed: Adjustments
IDLE SPEED ADJUSTMENT
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Warm up engine in "PARK" or "NEUTRAL" until normal operating temperature is reached. Set parking brake and block wheels. Turn off all
accessories.
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Remove air cleaner, disconnect and plug vacuum line at bottom of air cleaner.
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With the ignition off, disconnect Engine Coolant Temperature (ECT) sensor connector.
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Start engine and open the throttle momentarily three times.
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Using an allen wrench, adjust idle speed motor maximum extension to specification by turning the Idle Speed Control (ISC) adjusting screw. See:
Specifications
NOTE: On some carburetor applications the maximum extension adjusting screw will have a jam nut. It is important to tighten the jam nut to 25
lbs-in after setting the maximum extension screw.
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With the engine still running, put the fast idle screw on the kickdown step (second highest step) of the fast idle cam and adjust to specification.
See: Specifications
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Open throttle momentarily, reconnect the ECT sensor connector, and then shut off ignition.
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Reinstall air cleaner.
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Restart engine. Verify curb idle speed is within specification.
NOTE: If engine curb idle rpm is not within specification after performing this procedure, perform Electronic Engine Controls (EEC) Quick Test.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection
