Asked in
Fuel and Engines
Emissions and Exhaust Systems
Mufflers and Tailpipes
EGR Systems

A car's tailpipe blows black smoke while cruising at 45 mph what is the cause?

Answer

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Wiki User
November 26, 2009 10:41PM

The car's fuel system is very "rich". You are probably getting terrible gas mileage. See your mechanic.