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GMC
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1991
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C3500 HD 6.2 J, Standard, NV4500/MT8
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Repair and Diagnosis
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Engine Performance
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Engine Controls - Adjustments
Engine Controls - Adjustments
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Engine Mechanical
Engine Compression
Valve Clearance
Ignition Timing (Gasoline)
4-Cylinder Ignition Timing
2.5L (VIN E)
V6 Ignition Timing
2.8L (VIN R)
3.1L (VIN D)
4.3L (VIN Z)
V8 Ignition Timing
All Models (Except Diesel)
Injection Pump Timing (Diesel)
6.2L (VIN C & J)
Idle Speed & Mixture
Gasoline
Notes
Minimum Idle Speed Adjustment (7.4L Only)
Idle Speed (Diesel)
Curb Idle
Fast Idle
Purging Fuel System (Diesel)
Throttle Position Sensor (TPS)
TPS Adjustment (Gasoline)
Notes
2.8L (VIN R)
TPS Adjustment (Diesel)
6.2L Light Duty (VIN C)
6.2L Heavy Duty (VIN J)
Vacuum Regulator Valve/ Detent Switch Adjustment (Diesel)
WASTEGATE Actuator Adjustment (Turbo)