EXCESSIVE EXHAUST NOISE
by Mark Davidson

SYMPTOM SUMMARY
The vehicle exhibits excessive exhaust noise. The problem may be more noticeable when the engine is cold and may diminish once the engine is at operating temperature.

USUAL CAUSE
This symptom is usually caused by an exhaust leak.

DIAGNOSIS
A visual inspection of the exhaust system will be necessary. If there is a spitting noise that eminates from under the hood and diminishes after the engine is warm, the most likely cause is an exhaust manifold gasket. The round gasket that is between the exhaust manifold and exhaust pipe, sometimes referred to as a collector gasket, can also be the cause. If the problem is present at all times you should inspect the exhaust system from the engine back. Look for black exhaust marks from the mating surfaces of the parts of the exhaust systems. This is a key indicator of a leaking flange or joint. Inspect the muffler, pipes, and catalytic converter for damage.

PRECAUTIONS, TIPS, and NOTES
Be cautious when working around hot exhaust components and rotating engine parts. Always work in a well ventilated area. Exhaust leaks should be repaired immediately. The exhaust system is designed to route the harmful exhaust gases to the back of the vehicle where they are safely discharged away from the passenger compartment. An exhaust leak poses a considerable hazard to the occupants of the vehicle. Exhaust gases can be sucked into the vehicles passenger compartment through the ventilation ducts causing injury or death to the occupants.

(Mark gave up on sports when the Browns left Cleveland and now spends his Sundays working under a shade tree in the back yard tuning his son’s soap box derby car.)