Condition | Possible Sources | Actions |
|---|---|---|
Catalytic converters | MOVE the exhaust system to simulate the bouncing action of the vehicle, checking for exhaust-to-body contact while moving the exhaust system. Using a rubber mallet, TAP on the exhaust components to duplicate the noise concern. Lightly TAP on the muffler and the catalytic converters. DETERMINE if there are loose or broken baffles in the muffler, or a loose or broken element in the catalytic converter. REPAIR or INSTALL new components as necessary. | |
Exhaust muffler/resonator drain hole enlarged due to corrosion | CONFIRM the drain holes are the noise source. INSTALL new components as necessary. | |
Hissing or rushing noise — high frequency sound and the vehicle performance is unaffected | Exhaust system Exhaust flow through pipes | CHECK the exhaust system for leaks. Using a rubber mallet, TAP on the exhaust components to duplicate the noise concern. Lightly TAP on the muffler and the catalytic converter. DETERMINE if there are loose or broken baffles in the muffler, or a loose or broken element in the catalytic converter. REPAIR or INSTALL new components as necessary. |
Pinging noise — occurs when exhaust system is hot, engine turned off | Catalytic converters/exhaust system | Cool down pinging is a result of the exhaust system expanding and contracting during heating and cooling. This is a normal condition. |
Vibration — occurs at idle and at low speeds. Also accompanied by a clunk or buzz type noise | Loose or damaged exhaust isolator | INSPECT the exhaust isolators for wear or damage. INSTALL new isolators as necessary. |
Loose or damaged exhaust isolator hanger brackets | INSPECT the exhaust isolator hanger brackets for wear or damage. INSTALL or REPAIR as necessary. | |
Exhaust system grounded to chassis | REPAIR or INSTALL new components as necessary. | |
Engine drumming noise — normally accompanied by vibration | Damaged or misaligned exhaust system | INSPECT the exhaust system for loose or damaged fasteners or isolators. REPAIR or INSTALL new components as necessary. |
Sputter type noise — noise worse when cold, lessens or disappears when the vehicle is at operating temperature | Damaged or worn exhaust system | INSPECT the exhaust system for leaks or damage. REPAIR as necessary. |
Thumping noise — from the bottom of the vehicle, worse during acceleration | Misaligned exhaust system | CHECK the exhaust system to chassis clearance. CHECK the exhaust system isolators for damage. REPAIR as necessary. |
Engine vibration — is felt with increases and decreases in engine rpm | Strain on exhaust system isolators | REPAIR or INSTALL new components as necessary. |
Drumming noise — occurs inside the vehicle during idle or high idle, hot or cold. Very low-frequency drumming is very rpm dependent | Exhaust system vibration excites the body resonances inducing interior noise | REPAIR or INSTALL new components as necessary. |
Copyright © 2016 Ford Motor Company
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.