HOW DO I CHECK AND ADJUST THE TIMING

1990 Chevrolet Astro

Tiny

2CarPros-Archives

October, 22, 2010 AT 3:55 AM

1990 Chevrolet Astro 6 cylinders 4.3 liter. How do I check and adjust the timing?

FOUND 339 RELATED QUESTIONS

1 Answer

Tiny

2CarPros-Archives

October, 22, 2010 AT 4:06 AM

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.

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