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BASIC WARM ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING Accelerator pump defective Repair or replace pump see FUEL SYSTEMS Secondary throttles not closed Inspect lockout adjustment, see FUEL SYSTEMS Sag or Stall After Warmup Defective choke control switch Replace choke control switch, see FUEL SYSTEMS Defective accelerator pump Replace pump, see FUEL SYSTEMS Float level incorrect (too low) Adjust float level, see FUEL SYSTEMS Backfiring & Black Smoke Plugged heat crossover system Remove restriction CONDITION & POSSIBLE CAUSE CORRECTION Hesitation With Small Amount of Gas Pedal Movement Vacuum leak Inspect vacuum lines Accelerator pump weak or inoperable Replace pump, see FUEL SYSTEMS Float level setting too low Reset float level, see,FUEL SYSTEMS Metering rods sticking or binding Inspect and/or replace rods, see FUEL SYSTEMS Carburetor idle or transfer system plugged Inspect system and remove restriction Frozen or binding heated air inlet Inspect heated air door for binding Hesitation With Heavy Gas Pedal Movement Defective accelerator pump Replace pump, see FUEL SYSTEMS Metering rod carrier sticking or binding Remove restriction Large vacuum leak Inspect vacuum system and
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
DIESEL ENGINE TROUBLE SHOOTING BASIC DIESEL ENGINE TROUBLE SHOOTING CHART repair leak Float level setting too low Reset float level, see FUEL SYSTEMS Defective fuel pump, lines or filter Inspect pump, lines and filter Air door setting incorrect Adjust air door setting, see FUEL NOTE: This is GENERAL information. This article is not intended to be NOTE: Diesel engines mechanical diagnosis is the same as gasoline CONDITION & POSSIBLE CAUSE CORRECTION Engine Won't Crank Bad battery connections or dead batteries Check connections and/or replace batteries Bad starter connections or bad starter Check connections and/or replace starter Engine Cranks Slowly, Won't Start Bad battery connections or dead batteries Check connections and/or replace batteries Engine oil too heavy Replace engine oil Engine Cranks Normally, But Will Not Start Glow plugs not functioning Check glow plug system, see FUEL SYSTEMS Glow plug control not functioning Check controller, see
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
FUEL SYSTEMS Fuel not injected into cylinders Check fuel injectors, see FUEL SYSTEMS No fuel to injection pump Check fuel delivery system Fuel filter blocked Replace fuel filter Fuel tank filter blocked Replace fuel tank filter Fuel pump not operating Check pump operation and/or replace pump Fuel return system blocked Inspect system and remove restriction No voltage to fuel solenoid Check solenoid and connections Incorrect or contaminated fuel Replace fuel Incorrect injection pump timing Re-adjust pump timing, see FUEL SYSTEMS Low compression Check valves, pistons, rings, see ENGINES Injection pump malfunction Inspect and/or replace injection pump Engine Starts, Won't Idle Incorrect slow idle adjustment Reset idle adjustment, see TUNE-UP Fast idle solenoid malfunctioning Check solenoid and connections Fuel return system blocked Check system and remove restrictions Glow plugs go off too soon See glow plug diagnosis in FUEL SYSTEMS Injection pump timing incorrect Reset pump timing, see FUEL SYSTEMS No fuel to injection pump Check fuel delivery system Incorrect or contaminated fuel Replace fuel Low compression Check valves, piston, rings, see ENGINES Injection pump malfunction Replace injection pump, see FUEL SYSTEMS Fuel solenoid closes in RUN position Check solenoid and
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
connections Engines Starts/Idles Rough W/out Smoke or Noise Incorrect slow idle adjustment Reset slow idle, see TUNE-UP Injection line fuel leaks Check lines and connections Fuel return system blocked Check lines and connections Air in fuel system Bleed air from system Incorrect or contaminated fuel Replace fuel Injector nozzle malfunction Check nozzles, see FUEL SYSTEMS Engines Starts and Idles Rough W/out Smoke or Noise, But Clears After Warm-Up Injection pump timing incorrect Reset pump timing, see FUEL SYSTEMS Engine not fully broken in Put more miles on engine Air in system Bleed air from system Injector nozzle malfunction Check nozzles, see FUEL SYSTEMS Engine Idles Correctly, Misfires Above Idle Blocked fuel filter Replace fuel filter Injection pump timing incorrect Reset pump timing, see FUEL SYSTEMS Incorrect or contaminated fuel Replace fuel Engine Won't Return To Idle Fast idle adjustment incorrect Reset fast idle, see TUNE- UP Internal injection pump malfunction Replace injection pump, see FUEL SYSTEMS External linkage binding Check linkage and remove binding Fuel Leaks On Ground Loose or broken fuel line Check lines and connections Internal injection pump seal leak Replace injection pump, see FUEL SYSTEMS
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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