Visual/Physical Check

Several of the symptom procedures call for a careful visual/physical check. This can lead to correcting a problem without further checks and can save valuable time.

This check should include the following items:

• ECM grounds for cleanliness, tightness and proper location.
• Vacuum hoses for splits, kinks, and proper connections, as shown on the "Vehicle Emission Control Information" label. Check thoroughly for any type of leak or restriction.
• Air intake ducts for collapsed or damaged areas.
• Air leaks at throttle body mounting area, mass air flow (MAF) sensor and intake manifold sealing surfaces.
• Ignition components for cracking, hardness, and carbon tracking.
• Wiring for proper connections, pinches and cuts.