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BASIC ELECTRONIC IGNITION TROUBLE SHOOTING CHARTS - USING Open circuit between distributor and bulkhead connector Repair circuit Open circuit between bulkhead connector and ignition Repair circuit Open circuit between ignition switch and starter solenoid Repair circuit Engine Runs Rough Fuel lines leaking or clogged Tighten fitting, remove restriction Initial timing incorrect Reset ignition timing see ENGINE PERFORMANCE Centrifugal advance malfunction Repair distributor advance Defective spark plugs or wiring Replace plugs or plug wiring Component Failure Spark arc-over on cap, rotor or coil Replace cap, rotor or or coil Defective pick-up coil Replace pick-up coil Defective ignition coil Replace ignition coil Defective vacuum unit Replace vacuum unit Defective control module Replace control module CONDITION & POSSIBLE CAUSE CORRECTION Firing Voltage Lines are the Same, but Abnormally High Retarded ignition timing Reset ignition timing, see ENGINE PERFORMANCE section Fuel mixture too lean Readjust carburetor, see ENGINE PERFORMANCE High resistance in coil wire Replace coil wire Corrosion in coil tower terminal Clean and/or replace coil Corrosion in distributor coil terminal Clean and/or replace distributor cap Firing Voltage Lines are the Same but Abnormally Low Fuel mixture too rich Readjust carburetor, see
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
ENGINE PERFORMANCE Breaks in coil wire causing arcing Replace coil wire Cracked coil tower causing arcing Replace coil Low coil output Replace coil Low engine compression Determine cause and repair One or More, But Not All Firing Voltage Lines are Higher Than Others Carburetor idle mixture not balanced Readjust carburetor, see ENGINE PERFORMANCE EGR valve stuck open Clean and/or replace valve High resistance in spark plug wires Replace spark plug wires Cracked or broken spark plug insulator Replace spark plugs Intake vacuum leak Repair leak Defective spark plugs Replace spark plugs Corroded spark plug terminals Replace spark plugs One or More, But Not All Firing Voltage Lines Are Lower Than Others Curb idle mixture not balanced Readjust carburetor, see ENGINE PERFORMANCE Breaks in plug wires Replace plug wires causing arcing Cracked coil tower causing arcing Replace coil Low compression Determine cause and repair Defective spark plugs Replace spark plugs Corroded spark plugs Replace spark plugs Cylinders Not Firing Cracked distributor cap terminals Replace distributor cap Shorted spark plug wire Determine cause and repair Mechanical problem in engine Determine cause and repair Defective spark plugs Replace spark plugs Spark plugs fouled Replace spark plugs
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
BASIC DRIVEABILITY PROBLEMS TROUBLE SHOOTING CONDITION & POSSIBLE CAUSE CORRECTION Hard Starting Binding carburetor linkage Eliminate binding Binding choke linkage Eliminate binding Binding choke piston Eliminate binding Restricted choke vacuum Check vacuum lines for blockage Worn or dirty needle valve and seat Clean carburetor, see ENGINE PERFORMANCE Float sticking Readjust or replace float see the ENGINE PERFORMANCE section Incorrect choke adjustment Reset choke adjustment see ENGINE PERFORMANCE Defective coil Replace coil Improper spark plug gap Regap spark plugs Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Detonation Over-advanced ignition timing Reset ignition timing see ENGINE PERFORMANCE Defective spark plugs Replace spark plugs Fuel lines clogged Clean fuel lines EGR system malfunction Check and repair EGR system PCV system malfunction Repair PCV system Vacuum leaks Check and repair vacuum system Loose fan belts Tighten or replace fan belts, see ENGINE PERFORMANCE Restricted airflow Remove restriction
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
Vacuum advance malfunction Check distributor operation Dieseling Binding carburetor linkage Eliminate binding Binding throttle linkage Eliminate blinding Binding choke linkage or fast idle cam Eliminate binding Defective idle solenoid Replace idle solenoid see ENGINE PERFORMANCE Improper base idle speed Reset idle speed, see see ENGINE PERFORMANCE Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Incorrect idle mixture setting Reset idle mixture, see ENGINE PERFORMANCE Faulty Acceleration Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Engine cold and choke too lean Adjust choke and allow engine to warm-up Defective spark plugs Replace spark plugs Defective coil Replace coil Faulty Low Speed Operation Clogged idle transfer slots Clean idle transfer slots, see FUEL Restricted idle air bleeds and passages Disassemble and clean carburetor, see FUEL Clogged air cleaner Replace air filter Defective spark plugs Replace spark plugs Defective ignition wires Replace ignition wire see ENGINE PERFORMANCE Defective distributor cap Replace distributor cap
2008 Chevrolet Silverado 1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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