Mechanics

HOW DO I CHECK AND ADJUST THE TIMING

1990 Chevrolet Astro • 6 cylinder 2WD Automatic • 100,000 miles

1990 Chevrolet Astro 6 cylinders 4.3 liter. How do I check and adjust the timing?
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2CarPros-Archives
October 22, 2010.




Disconnect the tan/black wire EST (electronic spark timing) by-pass connector located near the heater housing in the engine compartment on the S/T series, or near the distributor on all other V-6 models. Do not disconnect the four- (4) wire connector at distributor. Connect the timing light to the No. 1 spark plug wire. Check timing and adjust to "0" degrees BTDC. With the engine off, reconnect the EST by-pass connector and clear the ECM trouble codes by disconnecting the battery.

Tiny
2CarPros-Archives
Oct 22, 2010.


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