Visual Inspection Chart

INSPECTION AND VERIFICATION

Exhaust Leakage or Noise
- Exhaust system performance complaints such as excessive back pressure, exhaust odor or excessive noise are usually noticeable by their effect on the performance of the engine.

- However, other malfunctioning components may have similar effects on the performance of the engine and be characterized by the same symptoms or complaints.

VISUAL INSPECTION
1. Visually inspect the components of the catalytic converter and exhaust system and related controls that may affect exhaust gas quality or cause a backfire or loss of power as follows:

- Leaking fuel injectors nozzle tips.
- Damaged air inlet passages.
- Inoperative Exhaust Gas Recirculation (EGR) valve.
- Exhaust pipe pinched, crushed.
- Damaged, loose vacuum hoses.
- Incorrect idle speed.
- Dirty engine air cleaner.
- Damaged catalytic converter.
- Misrouted, damaged wiring.
- Damaged ignition coil, distributor or spark plugs.
- Corroded, loose connectors.

2. Inspect and wiggle the wiring connectors and solenoids and other components for obvious problems due to looseness, corrosion, or other damage. This must be done when the engine is at operating temperature so as to activate the systems controls.
3. Check the vacuum tubing and connections for looseness, pinching, leakage, splitting, blockage, or other damage that may cause malfunction.
4. If a vacuum tube or orifice (restrictor) blockage is suspected as the obvious cause of malfunction, correct the cause before proceeding to the next step.
5. Check engine oil for fuel dilution.
6. If all checks are OK, proceed to the pinpoint tests.