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CONDITION POSSIBLE CAUSES CORRECTION EXCESSIVE EXHAUST NOISE 1. Leak at exhaust pipe joints. 1. Tighten clamps at leaking joints. 2. Burned or rusted out muffler 2. Replace muffler resonator tailpipe 3. Burned or rusted out resonator. 3. Replace muffler resonator tailpipe 4. Restriction in exhaust system. 4. Perform Exhaust System 5. Converter material in muffler. 5. Replace muffler and converter DIAGNOSIS AND TESTING - EXHAUST SYSTEM Exhaust system restriction can be checked by mea- suring back pressure using the DRB III t and PEP module pressure tester. WARNING: THE NORMAL OPERATING TEMPERA- NOTE: For Special Tool identification, (Refer to 11 - (1) Disconnect and remove the upstream (before catalytic converter) oxygen sensor. (Refer to 14 - (2) Install the Exhaust Back Pressure Fitting Adaptor CH8519. (3) Connect the Low Pressure Sensor (15 psi) CH7063 to the back pressure fitting. (4) Following the PEP module instruction manual, connect all required cables to the DRB III t and PEP module. Select the available menu options on the t display screen for using the digital pressure gauge function. (5) Apply the park brake and start the engine. engine speed to 2000 RPM. Monitor the pressure t. Back pressure should not exceed specified limit. Refer to specification in table (7) If pressure exceeds maximum limits, inspect exhaust system for restricted component. For further EXHAUST BACK PRESSURE LIMITS Exhaust Back Pressure Limit (Max) Vehicle in Park/Neutral (no load) @2000 RPM 3.45 Kpa (0.5 psi) INSPECTION Inspect the exhaust pipes, catalytic converters, muffler, and resonators for cracked joints, broken NOTE: Slip joint band clamps are spot welded to ADJUSTMENTS A misaligned exhaust system is usually indicated by a vibration, rattling noise, or binding of exhaust Perform the following procedures to align the exhaust system: RS EXHAUST SYSTEM 11 - 3 EXHAUST SYSTEM (Continued) |