S10/T10 Blazer 4WD L4-119 1.9L VIN A 2-BBL (1983)
Idle Speed: Adjustments
Base Idle Speed
NOTE: Check ignition timing and valve clearances before making engine idle adjustment.
BASE IDLE SPEED ADJUSTMENT
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Set parking brake and block drive wheels.
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Place transmission in neutral.
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Initial preparation:
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Engine at normal operating temperature.
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Choke open.
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A/C off.
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Air cleaner installed.
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Distributor vacuum line, canister purge line, and EGR vacuum lines disconnected and plugged.
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Idle compensator vacuum lined closed by bending rubber hose.
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Adjust throttle adjust screw to specification. See: Specifications
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If A/C is installed:
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Turn A/C "ON", "Max COLD", blower on "HIGH".
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Open the throttle to approximately 1/3 and allow the throttle to close. This allows the speed-up solenoid to reach full travel.
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Adjust idle speed-up controller to base idle specification. See: Specifications