SOURCE: tengo una gmc la sierra
Clean off the crankshaft pulley at the front of the engine and put some paint on the timing marks. Start the car
and turn off any accessories such as climate control, lights and the
radio. Start the engine until it warms up.
Connect the timing light to the
battery and then to the number one ignition wire. Locate the assembly
line diagnostic link also called an ALDL and use a jump wire to connect
the diagnostic terminal "B" to the ground terminal marked "A". The ALDL
is located under the left side of the instrument panel. Not all models
of the GMC Sierra have an ALDL.
Tighten the distributor mounting bolts and recheck the timing. Remove
the jumper wire from the ALDL with the engine running. Turn the engine
off and remove the tachometer and timing light. Reconnect the number one
ignition wire.
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