Primary System Based Diagnostics: Overview

1996 Chevrolet G 30 Van V8-5.7L VIN RSECTION Overview
There are primary system based diagnostics which evaluate system operation and their effect on vehicle emissions. The primary system based diagnostics are listed in the following articles with a brief description of the diagnostic functionality.
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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.