Visual/Physical Inspection
VISUAL/PHYSICAL UNDERHOOD INSPECTIONA careful visual and physical underhood inspection must be performed as part of any diagnostic procedure or in finding the cause of a failure. This can often lead to fixing a problem without further steps. Inspect all vacuum hoses for correct routing, pinches, cuts or disconnects. Inspect all wires in the engine compartment for proper connections, burned or chafed spots, pinched wires, contact with sharp edges or the hot exhaust manifold. This visual/physical inspection is very important. It must be done carefully and thoroughly.