Visual/Physical Check

Several of the symptom procedures ask for a careful visual/physical check. This step is extremely important. The check can lead to correcting a problem without further checks and can save valuable time. This check includes:
^ Inspect the PCM grounds for being clean, tight, and in their proper location.
^ Inspect the vacuum hoses for splits, kinks, and proper connections, as shown on the Vehicle Emission Control Information label. Inspect thoroughly for any type of leak or restriction.
^ Inspect the mass air flow (MAF) sensor installation. The arrows on the plastic portion of the sensor must point toward the engine
^ Inspect the air intake ducts for being collapsed or for having damaged areas.
^ Test for air leaks at the Throttle body mounting area, the MAF sensor, and the intake manifold sealing surfaces.
^ Inspect the ignition wires for cracking, hardness, proper routing, and carbon tracking.
^ Inspect the engine harness wiring and terminals for proper connections, pinches, or cuts.