Visual and Physical Underhood Inspection

Perform a careful visual and physical underhood inspection when performing any diagnostic procedure or diagnosing the cause of an emission test failure. This can often lead to repairing a problem without further steps. Use the following guidelines when performing a visual and physical inspection:

• Inspect all vacuum hoses for the following conditions:
  • Correct routing
  • Pinches
  • Cuts
  • Disconnects
• Inspect all wires in the engine compartment for the following conditions:
  • Proper connections
  • Burned or chafed spots
  • Pinched wires
  • Contact with sharp edges
  • Contact with hot exhaust manifolds