1992 Ford Mustang GT, 2D Hatchback, StandardFACTORY OEM SERVICE PROCEDURE

Chart 12-Backfire (Intake Or Exhaust)

DIAGNOSTIC CHART 12-BACKFIRE (INTAKE OR EXHAUST)

System & Component(s) Reference
IGNITION
  • Scope Engine For: Spark Plugs, Wires, Coil, etc.
  • Crossed Wires, Ignition Timing
 See BASIC TESTING article.
VACUUM DISTRIBUTION
  • Vacuum Hoses, Connections
 Perform a visual and audible inspection.
EEC
  • EEC-IV Quick Test
 See TESTS W/CODES article.
THERMACTOR
  • Thermactor System Components
 See I - SYS/COMP TESTS article.
BASE ENGINE
  • Intake Manifold and Gaskets
  • Compression Checks
  • Camshaft
  • Valves
 Check Engine Mechanical Condition.
EXHAUST
  • Component (Restricted)
 Inspect exhaust system.
FUEL/THROTTLE BODY
  • Fuel Filter
  • Fuel Pump
  • Water/Dirt/Rust Contamina- tion in Fuel
  • Fuel Lines
  • Fuel Pressure Regulator
  • Injectors
  • Fuel Sender Filter
  • Octane
 Perform a visual inspection. See FUEL SYSTEMS in I - SYS/COMP TESTS article.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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