Brad's Car Manuals
: A 3rd party mirror of CHARM + LEMON car manuals
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GMC
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1997
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C3500 HD 7.4 J, Standard
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Repair and Diagnosis
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Engine Performance
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Engine Controls - Specifications - 7.4L
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Ignition Timing
Ignition Timing
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NOTE:
Ignition timing is controlled by control module and is not adjustable.