Question about 1997 GMC 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.
Posted on May 23, 2011
I have a 98 gmc 2500 that the tach is reading about twice what the engine is actually running at. It is a 5 speed if that makes a difference
Posted on Sep 09, 2011
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Posted on Jan 02, 2017
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