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Improper ignition timing Reset ignition timing, See TUNE-UP Faulty accelerator pump discharge Replace accelerator pump Improper choke operation Check choke and adjust as required Defective EGR valve Replace EGR valve Fuel mixture too lean Reset air/fuel mixture, See TUNE-UP Choke valve initial clearance too large Reset choke valve initial clearance Exhaust Backfire Vacuum leak Inspect and repair vacuum system Faulty vacuum diverter valve Replace vacuum diverter valve Faulty choke operation Check choke and adjust as required Exhaust system leak repair exhaust system leak Engine Detonation Ignition timing too far advanced Reset ignition timing, See TUNE-UP Faulty ignition system Check ignition timing, See TUNE-UP Spark plugs loose or faulty Retighten or replace plugs Fuel delivery system clogged Inspect lines, pump and filter for clog EGR valve inoperative Replace EGR valve PCV system inoperative Inspect and/or replace hoses or valve Vacuum leaks Check vacuum system and repair leaks Excessive combustion chamber deposits Remove built-up deposits Leaking, sticking or broken valves Inspect and/or replace valves External Oil Leakage Fuel pump improperly seated or worn gasket Remove pump, replace gasket and seat properly
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Oil pan gasket broken or pan bent Straighten pan and replace gasket Timing chain cover gasket broken Replace timing chain cover gasket Rear main oil seal worn Replace rear main oil seal Oil pan drain plug not seated properly Remove and reinstall drain plug Camshaft bearing drain hole blocked Remove restriction Oil pressure sending switch leaking Remove and reinstall sending switch Excessive Oil Consumption Worn valve stems or guides Replace stems or guides, See ENGINES Valve "O" ring seals damaged Replace "O" ring seals, See ENGINES Plugged oil drain back holes Remove restrictions Improper PCV valve operation Replace PCV valve Engine oil level too high Remove excess oil Engine oil too thin Replace thicker oil Valve stem oil deflectors damaged Replace oil deflectors Incorrect piston rings Replace piston rings, See ENGINES Piston ring gaps not staggered Reinstall piston rings, See ENGINES Insufficient piston ring tension Replace rings, See ENGINES Piston ring grooves or oil return slots clogged Replace piston rings, See ENGINES Piston rings sticking in grooves Replace piston rings, See ENGINES Piston ring grooves excessively worn Replace piston and rings, See ENGINES Compression rings installed upside down Replace compression rings correctly, See ENGINES Worn or scored cylinder walls Rebore cylinders or replace block
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Mismatched oil ring expander and rail Replace oil ring expander and rail, See ENGINES Intake gasket dowels too long Replace intake gasket dowels Excessive main or connecting rod bearing clearance Replace main or connecting rod bearings, See ENGINES No Oil Pressure Low oil level Add oil to proper level Oil pressure sender or gauge broken Replace sender or gauge Oil pump malfunction Remove and overhaul oil pump, See ENGINES Oil pressure relief valve sticking Remove and reinstall valve Oil pump passages blocked Overhaul oil pump, See ENGINES Oil pickup screen or tube blocked Remove restriction Loose oil inlet tube Tighten oil inlet tube Loose camshaft bearings Replace camshaft bearings, See ENGINES Internal leakage at oil passages Replace block or cylinder head Low Oil Pressure Low engine oil level Add oil to proper level Engine oil too thin Remove and replace with thicker oil Excessive oil pump clearance Reduce oil pump clearance, See ENGINES Oil pickup tube or screen blocked Remove restrictions Main, rod or cam bearing clearance excessive Replace bearing to reduce clearance, See ENGINES High Oil Pressure Improper grade of oil Replace with proper oil Oil pressure relief valve stuck closed Eliminate binding Oil pressure sender or gauge faulty Replace sender or gauge Noisy Main Bearings
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Inadequate oil supply Check oil delivery to main bearings Excessive main bearing clearance Replace main bearings, See ENGINES Excessive crankshaft end play Replace crankshaft, See ENGINES Loose flywheel or torque converter Tighten attaching bolts Loose or damaged vibration damper Tighten or replace vibration damper Crankshaft journals out-of-round Re-grind crankshaft journals Excessive belt tension Loosen belt tension Noisy Connecting Rods Excessive bearing clearance or missing bearing Replace bearing, See ENGINES Crankshaft rod journal out-of-round Re-grind crankshaft journal Misaligned connecting rod or cap Remove rod or cap and realign Incorrectly tightened rod bolts Remove and re-tighten rod bolts Noisy Pistons and Rings Excessive piston-to-bore clearance Install larger pistons, See ENGINES Bore tapered or out-of-round Rebore block Piston ring broken Replace piston rings, See ENGINES Piston pin loose or seized Replace piston pin, See ENGINES Connecting rods misaligned Realign connecting rods Ring side clearance too loose or tight Replace with larger or smaller rings Carbon build-up on piston Remove carbon Noisy Valve Train Worn or bent push rods Replace push rods, See ENGINES Worn rocker arms or bridged pivots Replace push rods, See
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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