1995 GMC Suburban how to adjust timing

1995 GMC SUBURBAN
120,000 MILES • V8 • 4WD • AUTOMATIC
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SCOTT208
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My timing is too high and I am wondering how to adjust it. I am looking for the specifications. There is not a sticker under my hood.
Thanks
Feb 5, 2010 at 10:42 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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BIGRAYMARTIN
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I have asked a similar question, which may be helpful... my question is: "does this gmc have EST - electronic spark timing?" If it does, then you must unplug the EST in the relay box on the firewall before you use a timing light to view the "teeth" and the timing mark on the pulley, using a strobe light. Best done by a mechanic, amateurs are often injured by fan blades and belts.
Feb 7, 2010 at 11:43 AM