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DIAGNOSIS AND TESTING EXHAUST SYSTEM CONDITION POSSIBLE CAUSES CORRECTION EXCESSIVE EXHAUST NOISE (UNDER HOOD) 1. Exhaust manifold cracked or 1. Replace manifold. 2. Manifold to cylinder head leak. 2. Tighten manifold and/or replace 3. EGR tube to manifold gasket 3. Tighten fasteners or replace 4. EGR Valve to EGR tube gasket 4. Tighten fasteners or replace 5. Exhaust to manifold leak. 5. Tighten or replace V-Band Clamp. 6. Pipe and shell noise from front 6. Characteristic of single wall pipe. EXCESSIVE EXHAUST NOISE 1. Leak at exhaust pipe joints. 1. Tighten clamps at leaking joints. 2. Burned or rusted out muffler 2. Replace exhaust module, rear 3. Burned or rusted out 3. Replace resonator assembly. 4. Restriction in exhaust system. 4. Remove restriction if possible, or 5. Converter material in muffler or 5. Replace muffler, resonators and REMOVAL AND INSTALLATION EXHAUST SYSTEM REMOVAL It is easier to service the exhaust system module components (Fig. 2), when system is removed from (1) Raise vehicle on hoist. at resonator connector. (3) Separate exhaust module at front resonator from the converter downpipes. CAUTION: At this time, the exhaust system is held based lubricant on the isolators. This will damage (4) Support exhaust system with jack stand. pension crossmember and support brackets on body (6) Lower exhaust system and lay on the ground. NOTE: When replacement is required on any com- • To insure proper alignment with other parts in the system. • Provide acceptable exhaust noise levels and does not change exhaust system back pressure that could INSTALLATION (1) Install and loose assemble the front resonator to the converter pipes. 300M EXHAUST SYSTEM AND INTAKE MANIFOLD 11 - 3 |