For 1990-2009 cars

• | Review the Exhaust System Description and Operation in order to familiarize yourself with the system functions. Refer to Exhaust System Description.

• | All diagnostics on a vehicle should follow a logical process. Strategy Based Diagnostics is a uniform approach for repairing all systems. The diagnostic flow is the place to start when repairs are necessary and may always be used in order to resolve a system problem. For a detailed explanation, refer to Strategy Based Diagnosis.

### Visual/Physical Inspection

• | Inspect for aftermarket or non-OEM devices such as, but not including; tailpipe extensions, mufflers, and exhaust hangers. This could affect the operation and proper performance of the exhaust system.

• | Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine temperature, engine load, and frequency of concern.

• | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause any symptom.

### Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed.

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• | Loss of power--Refer to Restricted Exhaust.

• | Poor acceleration--Refer to Restricted Exhaust.

• | Poor fuel economy--Refer to Restricted Exhaust.

• | Exhaust hissing noise--Refer to Exhaust Leakage.

• | Exhaust popping noise--Refer to Exhaust Leakage.

• | Exhaust rattle noise--Refer to Exhaust Noise.

• | Loud exhaust noise--Refer to Exhaust Noise.

• | Exhaust buzz, groan, hum noise--Refer to Exhaust Noise.