chevrolet Workshop Repair Guides

Chevrolet Workshop Service and Repair Manuals

Throttle Full Open Switch > < Idle Switch <--> [Throttle Full Close Switch]|Testing and Inspection|Page 2031
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Fig. 14 Wide open throttle micro switch adjustment

Diagnostic Code 21, Wide Open Throttle Microswitch

1.

Remove air cleaner and carburetor.

2.

Connect ohmmeter to switch as shown in Fig. 12. Resistance between terminals should be infinite.

3.

Open throttle gradually until ohmmeter indicates zero ohm. Measure clearance between throttle butterfly and carburetor bore, Fig. 13. Clearance
should be .29 - .33 inch (7.2 - 8.4 mm). If clearance is out of range, adjust by bending lever, Fig. 14.

Throttle Full Open Switch > < Idle Switch <--> [Throttle Full Close Switch]|Testing and Inspection|Page 2031