Chevrolet Silverado / GMC Sierra. Manual — part 1220
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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