- Visual/Physical Underhood Inspection

Several of the symptom procedures call for a Careful Visual/Physical Check. The importance of this step cannot be stressed too strongly - it can lead to correcting a problem without further checks and can save valuable time. This check should include:

^ PCM grounds for being clean, tight, and in their 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.

^ Mass Air Flow (MAF) sensor installation. The arrows on the plastic portion of the sensor must point toward the engine.

^ 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 wires for cracking, hardness, proper routing and carbon tracking.

^ Wiring for proper connections, pinches and cuts.