Visual/Physical Check

Several of the symptom procedures call for a careful visual/physical check. This can lead to correcting a problem without further checks and can save valuable time. Visual check should include:

• Air leaks at throttle body mounting area, Mass Air Flow (MAF) sensor and intake manifold sealing surfaces.
• Air intake ducts for collapsed or damaged areas.
• Ignition components for cracking, hardness, and carbon tracking.
• PCM grounds for cleanliness, tightness and proper location.
• Vacuum hoses for splits, kinks, and proper connections. Check thoroughly for any type of leak or restriction. See appropriate DIAGRAM in VACUUM DIAGRAMS article.
• Wiring for proper connections, pinches and cuts.