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Home >> GMC >> 2001 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.5L - Troubleshooting

Engine Controls - 6.5L - Troubleshooting

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Symptoms - Engine Controls
- Before Using This Section
- Visual and Physical Checks
- Verify Customer's Concern
Intermittent Conditions
- Notes
- Preliminary Checks
- Electrical Connections or Wiring
- Road Test
- Intermittent Malfunction Indicator Lamp (MIL)
- Loss of DTC Memory
- Additional Checks
Hard Start
Surges/Chuggles
Lack of Power, Sluggishness, or Sponginess
Fuel Knock/Combustion Noise
Hesitation, Sag, Stumble
Cuts Out, Misses
Poor Fuel Economy
Excessive Smoke
Water-in-Fuel Lamp Inoperative
- Circuit Description
- Test Description
Water-in-Fuel Lamp Always On
- Circuit Description
- Test Description
Engine Cranks but Does Not Run
- Circuit Description
- Diagnostic Aids
- Test Description
Fuel Pump Electrical Circuit Diagnosis
- Circuit Description
- Test Description
Fuel System Diagnosis
- Notes
- Fuel Lift Pump Flow Check
- Fuel Lift Pump Suction Line Check
- Fuel Lift Pump Pressure Check
- Fuel System Air Leak Check
- Fuel Lift Pump Electrical Circuit
Fuel Tank Leak Test
- Notes
- Leak Check Procedure
Fuel Injection Nozzle Diagnosis
- Notes
- Injector Balance Test
- Nozzle Opening Pressure Test
- Nozzle Leak Test
Contaminants-in-Fuel Diagnosis
- Notes
- Cleaning Water from the Fuel System
- Cleaning Gasoline from the Fuel System
Fuel Heater Inoperative
- Circuit Description
- Test Description
Glow Plug System Diagnosis
- Circuit Description
- Diagnostic Aids
- Test Description

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