- Visual/Physical Underhood Inspection

Several of the symptom procedures ask for a Careful Visual/Physical Check. This step is extremely important it can lead to correcting a problem without further checks and can save valuable time. This check includes:
- The 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.
- The Mass Air Flow (MAF) sensor installation. The arrows on the plastic portion of the sensor must point toward the engine
- The air intake ducts for being collapsed or for having damaged areas.
- Air leaks at throttle body mounting area, Mass Air Flow (MAF) sensor, and the intake manifold sealing surfaces.
- The ignition wires for cracking, hardness, proper routing and carbon tracking.
- The engine harness wiring and terminals for proper connections, pinches or cuts.