Underhood Inspection

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

• Inspect all of the vacuum hoses for correct routing, pinches, cuts, or disconnects.
• Inspect any hoses that are difficult to see.
• Inspect all of the wires in the engine compartment for the following conditions:
  • Burned or chafed spots
  • Pinched wires
  • Contact with sharp edges
  • Contact with hot exhaust manifolds