Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1678 (EXHAUST SYSTEM)DIAGNOSTIC TESTSEXHAUST SYSTEMSYMPTOM CHART - EXHAUST SYSTEM

2009 Mercury Milan Premier, 3.0 1, AWD

Symptom Chart - Exhaust System

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Symptom Chart - Exhaust System

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Possible Sources	Action
Vehicle has low or no power - vehicle performance complaint	Exhaust pipe pinched or crushed Damaged catalytic converter Loose obstruction in exhaust	INSPECT the exhaust components for damage. REPAIR or INSTALL new components as necessary. TEST the system for normal operation. If the concern is still present, REFER to the Introduction - Gasoline Engines article.
	Restricted exhaust (possible frozen condensate in muffler)	CHECK drain holes for foreign material. PARK the vehicle inside to thaw. TEST the vehicle for normal operation. If the concern is still present, REFER to the Introduction - Gasoline Engines article.
Burning smell - usually occurs at idle, with possible traces of smoke	Foreign material caught in exhaust system Missing heat shields	INSPECT the exhaust system for foreign material or missing heat shields. REPAIR or INSTALL new components as necessary. TEST the system for normal operation after the repair.
Odor - described as a sulfur or rotten egg smell	Catalytic converter Excessive sulfur content in fuel	At times, a slight sulfur smell is normal for catalytic converters. The cause is the sulfur content in the gasoline being used. ADVISE the customer no repair is required.
	Rich fuel conditions Misfire conditions	REFER to the Introduction - Gasoline Engines article.
Visible rust on surface of exhaust pipes	Catalytic converter/exhaust system	Surface rust is a characteristic of materials used on exhaust systems. Exposure to heat or road salt may result in surface rust. INSPECT for perforations. If there are no perforations, the condition is normal.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.