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Automobiles: Vehicle Pollution Prevention

Here are some things that may be wrong with your exhaust system, with their corresponding symptoms:

If smoke is coming out of the exhaust, it may mean:

• The fuel system is malfunctioning.
  
• The engine control computer system is malfunctioning.
  
• The engine may need major work due to worn piston rings or valves.
  

If an exhaust analyzer shows high carbon monoxide content, it may mean:

• The air filter is dirty.
  
• The PCV (positive crankcase ventilation) system is clogged.
  
• The cold start system is malfunctioning.
  
• The fuel system is operating too rich.
  
• The ignition timing is incorrectly adjusted.
  
• The thermostatic air control is malfunctioning.
  
• The air injection system is malfunctioning.
  

If an exhaust analyzer show high hydrocarbon content it may mean:

• Fouled spark plugs.
  
• Faulty spark plug wires.
  
• Faulty ignition cap or rotor.
  
• Incorrect ignition timing
  
• The fuel system is too rich.
  
• There's a vacuum leak.
  

For most cars, with modern computer-controlled sensors, accurate diagnosis is a "must" to save time, fuel and, of course, our environment.