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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 NOTE: Diesel engines mechanical diagnosis is the same as gasoline
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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