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Home >> GMC >> 1991 >> Syclone V6-262 4.3L Turbo >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Timing >> Adjustments
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Ignition Timing: Adjustments


To set ignition timing on this engine, put EST in bypass mode by disconnecting the timing connector. This is a single tan wire with a black stripe. This timing connector breaks out of the taped section of the wiring loom below the heater case in the passenger compartment.