Here is what the factory service manual says
OE does not publish a timing procedure for this vehicle. The timing is set by following the procedures on the Vehicle Emission Control Information label located in the engine compartment.
The spec is 10 degrees
Most vehicles have to be put into manual timing before setting base timing. On most GM OBD1 cars this can be done by jumping terminals A and B of the data link terminal.
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Thursday, October 7th, 2010 AT 7:09 AM