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Automobiles: Vehicle Pollution Prevention

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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.

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