This info is for the TFI System, and would be about the same for most applications.
1. Turn off all lights and accessories. Set parking brake and place transmission in Neutral. Ensure A/C and heater are off. Distributor-to-computer signal must be interrupted to accurately check or adjust timing. Disconnect the single wire in-line spout connector near distributor. Some engines use a double wire spout connector which requires removal of the shorting bar (end cap) on the end of the wire connector.
2. Connect timing light. Start engine and warm to normal operating temperature. With engine at specified RPM check timing, and adjust if necessary. Reconnect spout connector or reinstall shorting bar. Check timing advance to verify distributor is advancing properly. Remove tachometer and shut off engine.
Degrees BTDC @ RPM
Auto. Trans. - - 10 @ 675 Max.
Man. Trans. - - 10 @ 775 Max.
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Ignition timing or valve timing?
10 degrees BTDC
The 1988 Chevy Celebrity uses distributorless ignition. There is no provision to alter timing, the engine control module takes care of that.
You will need a timing light, set it at 10 degrees BTD
0 degrees
10 degrees BTD
With the tan/black timing wire disconnected, with engine idling and warm, ignition timing should be set to 0 degrees.
Your engine has distributor-less ignition. The spark timing is controlled by the ECM, there is no provision for adjustment.
Check the ignition coil on the Cheyenne. If it is ok, check the timing. The timing chain could have slipped or broken causing the engine to not start.
10 degrees