Visual/Physical Inspection

Several of the symptom procedures ask for a careful visual and physical inspection. This step is extremely important. The visual and physical inspection can lead to correcting a problem without further inspections, and can save valuable time. Ensure that:

• The ECM grounds are clean, tight, and in the proper location.
• The vacuum hoses are not split or kinked, and properly connected, as shown on the Vehicle Emission Control Information label. Inspect thoroughly for any type of leak or restriction.
• The Mass Air Flow (MAF) sensor is properly installed. The arrows on the plastic portion of the sensor must point toward the engine.
• The air intake ducts are not collapsed or damaged.
• There are no leaks at the throttle body mounting area, the MAF sensor, or the intake manifold sealing surfaces.
• The ignition wires are not cracked, brittle, or carbon tracked.
• The engine harness wiring and terminals are properly connected and are not pinched or cut.