Visual Inspection

NOTE: Several of the symptom procedures call for a careful visual/physical check. DO NOT neglect to perform the visual/physical check. The visual/physical check is an important procedure that can lead to the correction of a concern without further diagnosis. The performance of the visual/physical check can save valuable time.

Inspect all the PCM grounds for secure and clean connections that are in the proper location. Check all vacuum hoses for splits, kinks, and proper connections and routing, as shown on the vehicle emission control information label. Check for air leaks at throttle body mounting area and intake manifold sealing surfaces. Inspect the wiring harness for proper connections and damage. Visually inspect all electrical wiring. Look for chafed, stretched, cut or pinched wiring. Check the vacuum hoses thoroughly for any type of leak or restriction. Inspect the air inlet ducts for collapsed or restricted sections. If necessary, see VACUUM DIAGRAMS - VIBE article to verify routing and connections. Inspect air induction system for possible vacuum leaks. Repair as necessary. If vehicle has a no-start condition, go to NO-START DIAGNOSIS .