Routine 208-Backfire (Intake Or Exhaust)

DIAGNOSTIC ROUTINE 208-BACKFIRE

System & Component(s)	Reference
VACUUM DISTRIBUTION Vacuum Leaks	Visual and audible inspection.
IGNITION Scope engine for: Spark Plugs, Coil, Module, Secondary Wires, Distributor Cap and Rotor Base Timing Plus Advance and Retard Functions	See BASIC TESTING article.
BASIC ENGINE Compression Check Loose Intake Manifold Intake Manifold Gasket Camshaft Valves	Check engine mechanical condition.
EEC Quick Test	See TESTS W/CODES article.
Exhaust Components (Restricted)	Check exhaust system.
FUEL DELIVERY Filter Pump Water/Dirt/Rust Contamination in Fuel Lines Pressure Regulator Injectors Sender Filter	Perform fuel pressure test. See I - SYS/COMP TESTS article.