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ENGINES Dirt or chips in valve lifters Remove lifters and remove dirt/chips Excessive valve lifter leak-down Replace valve lifters, See ENGINES Valve lifter face worn Replace valve lifters, See ENGINES Broken or cocked valve springs Replace or reposition springs Too much valve stem-to-guide clearance Replace valve guides, See ENGINES Valve bent Replace valve, See ENGINES Loose rocker arms Retighten rocker arms, See ENGINES Excessive valve seat run-out Reface valve seats, See ENGINES Missing valve lock Install new valve lock Excessively worn camshaft lobes Replace camshaft, See ENGINES Plugged valve lifter oil holes Eliminate restriction or replace lifter Faulty valve lifter check ball Replace lifter check ball, See ENGINES Rocker arm nut installed upside down Remove and reinstall correctly Valve lifter incorrect for engine Remove and replace valve lifters Faulty push rod seat or lifter plunger Replace plunger or push rod Noisy Valves Improper valve lash Re-adjust valve lash, See ENGINES Worn or dirty valve lifters Clean and/or replace lifters Worn valve guides Replace valve guides, See ENGINES
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Excessive valve seat or face run-out Reface seats or valve face Worn camshaft lobes Replace camshaft, See ENGINES Loose rocker arm studs Re-tighten rocker arm studs, See ENGINES Bent push rods Replace push rods, See ENGINES Broken valve springs Replace valve springs, See ENGINES Burned,Sticking or Broken Valves Weak valve springs or warped valves Replace valves and/or springs, See ENGINES Improper lifter clearance Re-adjust clearance or replace lifters Worn guides or improper guide clearance Replace valve guides, See ENGINES Out-of-round valve seats or improper seat width Re-grind valve seats Gum deposits on valve stems, seats or guide Remove deposits Improper spark timing Re-adjust spark timing Broken Pistons/Rings Undersize pistons Replace with larger pistons, See ENGINES Wrong piston rings Replace with correct rings, See ENGINES Out-of-round cylinder bore Re-bore cylinder bore Improper connecting rod alignment Remove and realign connecting rods Excessively worn ring grooves Replace pistons, See ENGINES Improperly assembled piston pins Re-assemble pin-to-piston, See ENGINES Insufficient ring gap clearance Install new rings, See ENGINES Engine overheating Check cooling system Incorrect ignition timing Re-adjust ignition timing, See TUNE-UP Excessive Exhaust Noise
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
ENGINE PERFORMANCE CARBURETOR TROUBLE SHOOTING: BASIC COLD START SYMPTOMS TROUBLE SHOOTING CHART Leaks at manifold to head, or to pipe Replace manifold or pipe gasket Exhaust manifold cracked or broken Replace exhaust manifold, See ENGINES NOTE: This is GENERAL information. This article is not intended to be CONDITION & POSSIBLE CAUSE CORRECTION Engine Won't Start Choke not closing Check choke operation, see FUEL SYSTEMS Choke linkage bent Check linkage, see FUEL SYSTEM Engine Starts, Then Dies Choke vacuum kick setting too wide Check setting and adjust see, FUEL SYSTEMS Fast idle RPM too low Reset RPM to specification, see TUNE- UP Fast idle cam index incorrect Reset fast idle cam index, see FUEL SYSTEMS Vacuum leak Inspect vacuum system for leaks Low fuel pump outlet Repair or replace pump, see FUEL SYSTEMS Low carburetor fuel level Check float setting see FUEL SYSTEM Engine Quits Under Load
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
BASIC HOT START SYMPTOMS TROUBLE SHOOTING CHART BASIC COLD ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING Choke vacuum kick setting incorrect Reset vacuum kick setting,see FUEL SYSTEMS Fast idle cam index incorrect Reset fast idle cam index, see FUEL SYSTEM Incorrect hot fast idle speed RPM Reset fast idle RPM, see TUNE-UP Engine Starts, Runs Up, Then Idles, Slowly With Black Smoke Choke vacuum kick set too narrow Reset vacuum kick, see FUEL SYSTEMS Fast idle cam index incorrect Reset fast idle cam index, see FUEL SYSTEMS Hot fast idle RPM too low Reset fast idle RPM, see TUNE-UP CONDITION & POSSIBLE CAUSE CORRECTION Engine Won't Start Engine flooded Allow fuel to evaporate CONDITION & POSSIBLE CAUSE CORRECTION Engine Stalls in Gear Choke vacuum kick setting incorrect Reset choke vacuum kick, see FUEL SYSTEMS Fast idle RPM incorrect Reset fast idle RPM, see TUNE-UP Fast idle cam index incorrect Reset fast idle cam see FUEL SYSTEMS Acceleration Sag or Stall Defective choke control switch Replace choke control switch Choke vacuum kick setting incorrect Reset choke vacuum kick see, FUEL SYSTEMS Float level incorrect (too low) Adjust float level, FUEL SYSTEMS
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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