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The timeing is ajusted by the computer there are two coolent temp sinsers one goes to the dash and the other goes to the computer depending on the temp outside the computer ajust for cold or hot starts so the only ajustment is base timeing this is done by bring the number one cylender to top dead cinter and then puttin a timeing lite on the plug wire and checking the degree the specks for proper ajustment are on the fan shrout sticker

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11y ago
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Q: How do you set timing on 1999 GMC Sonoma 4.3 ltr vortech?
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