Chevrolet Silverado / GMC Sierra. Manual — part 1227
Faulty High Speed Operation
Incorrect ignition timing
Reset ignition timing see
ENGINE
PERFORMANCE
Defective distributor centrifugal advance
Replace advance
mechanism
Defective distributor vacuum advance
Replace advance unit
Incorrect spark plugs or plug gap
Check gap and/or replace
spark plugs
Faulty choke operation
Check choke and repair as
required
Clogged vacuum passages
Remove restrictions
Improper size or clogged main jet
Check jet size and clean,
see FUEL
Restricted air cleaner
Check filter and replace as
necessary
Defective distributor cap, rotor or coil
Replace cap, rotor or coil
Misfire at All Speeds
Defective spark plugs
Replace spark plugs
Defective spark plug wires
Replace spark plug wires
Defective distributor cap, rotor, or coil
Replace cap, rotor, or coil
Cracked or broken vacuum hoses
Replace vacuum hoses
Vacuum leaks
Repair vacuum leaks
Fuel lines clogged
Remove restriction
Hesitation
Cracked or broken vacuum
Replace vacuum hoses
hoses
Vacuum leaks
Repair Vacuum leaks
Binding carburetor linkage
Eliminate binding
Binding throttle linkage
Eliminate binding
Binding choke linkage or fast idle cam
Eliminate binding
Improper float setting
Readjust float setting, see
FUEL
Cracked or broken ignition wires
Replace ignition wires
Rough Idle, Missing or Stalling
Incorrect curb idle or fast idle speed
Reset idle speed, see see
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
ENGINE
PERFORMANCE
Incorrect basic timing
Reset ignition timing see
ENGINE
PERFORMANCE
Improper idle mixture adjustment
Reset idle mixture, see
ENGINE
PERFORMANCE
Improper feedback system operation
Check feedback system
see ENGINE
PERFORMANCE
Incorrect spark plug gap
Reset spark plug gap, see
ENGINE
PERFORMANCE
Moisture in ignition components
Dry components
Loose or broken ignition wires
Replace ignition wires
Damaged distributor cap or or rotor
Replace distributor cap or
rotor
Faulty ignition coil
Replace ignition coil
Fuel filter clogged or worn
Replace fuel filter
Damaged idle mixture screw
Replace idle mixture
screw, see FUEL
Improper fast idle cam adjustment
Reset fast idle cam
adjustment, see TUNE-
see ENGINE
PERFORMANCE
Improper EGR valve operation
Replace EGR valve
Faulty PCV valve air flow
Replace PCV valve
Choke binding or improper choke setting
Reset choke or eliminate
binding
Vacuum leak
Repair vacuum leak
Improper float bowl fuel level
Reset float adjustment, see
FUEL
Clogged air bleed or idle passages
Clean carburetor passages,
see FUEL
Clogged or worn air cleaner filter
Replace air filter
Faulty choke vacuum diaphragm
Replace diaphragm, see
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
ENGINE
PERFORMANCE
Exhaust manifold heat valve inoperative
Replace heat valve
Improper distributor spark advance
Check distributor
operation
Leaking valves or valve components
Check and repair
valvetrain
Improper carburetor mounting
Remove and remount
carburetor
Excessive play in distributor shaft
Replace distributor
Loose or corroded wiring connections
Repair or replace as
required
Engine Surges
Improper PCV valve airflow
Replace PCV valve
Vacuum leaks
Repair vacuum leaks
Clogged air bleeds
Remove restriction
EGR valve malfunction
Replace EGR valve
Restricted air cleaner filter
Replace air filter
Cracked or broken vacuum hoses
Replace vacuum hoses
Cracked or broken ignition wires
Replace ignition wires
Vacuum advance malfunction
Check unit and replace as
necessary
Defective or fouled spark plugs
Replace spark plugs
Ping or Spark Knock
Incorrect ignition timing
Reset ignition timing see
ENGINE
PERFORMANCE
Distributor centrifugal or vacuum advance malfunction
Check operation and
replace as necessary
Carburetor setting too lean
Readjust mixture setting,
see ENGINE
PERFORMANCE
Vacuum leak
Eliminate vacuum leak
EGR valve malfunction
Replace EGR valve
Poor Gasoline Mileage
Cracked or broken vacuum
Replace vacuum hoses
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
VACUUM PUMP - DIESEL TROUBLE SHOOTING
VACUUM PUMP (DIESEL) TROUBLE SHOOTING CHART
hoses
Vacuum leaks
Repair vacuum leaks
Defective ignition wires
Replace wires
Incorrect choke setting
Readjust setting, see
ENGINE
PERFORMANCE
Defective vacuum advance
Replace vacuum advance
Defective spark plugs
Replace spark plugs
Binding carburetor power piston
Eliminate binding
Dirt in carburetor jets
Clean and/or replace jets
Incorrect float adjustment
Readjust float setting, see
FUEL
Defective power valve
Replace power valve, see
ENGINE
PERFORMANCE
Incorrect idle speed
Readjust idle speed
Engine Stalls
Improper float level
Readjust float level
Leaking needle valve and seat
Replace needle valve and
seat
Vacuum leaks
Eliminate vacuum leaks
NOTE:
This is GENERAL information. This article is not intended to be
specific to any unique situation or individual vehicle configuration.
The purpose of this Trouble Shooting information is to provide a list
of common causes to problem symptoms. For model-specific
Trouble Shooting, refer to SUBJECT, DIAGNOSTIC, or TESTING
articles available in the section(s) you are accessing.
NOTE:
Diesel engines mechanical diagnosis is the same as gasoline
engines for items such as noisy valves, bearings, pistons, etc. The
following trouble shooting covers only items pertaining to diesel
engines.
2008 Chevrolet Silverado 1500
GENERAL INFORMATION Trouble Shooting - Basic Procedures
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