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Old 11-18-2012, 10:53 AM
 
383 posts, read 732,952 times
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Zombie thread?
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Old 11-20-2012, 11:24 PM
 
Location: East Dallas
931 posts, read 2,134,109 times
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What happened to the State Guys who would monitor cars and send demands to get car up to clean air compliance?
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Old 09-16-2014, 05:33 AM
 
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Default auto mechanic thomastown

The common causes of emission issues. Failing the emission test is likely the result of some common performance issues in your vehicle. Learning to anticipate and correct these issues can help you pass the emissions test, once you've got it scheduled. The most common system failures are:
-Out-of-spec fuel metering: This could be the result of the CPU, if your vehicle has one, or the fuel injection and carburetor unit.
-Worn-out spark plugs: These can cause hydrocarbons to spike during the examination.
-Vacuum leaks: These can occur because the MAP sensor is dysfunctional, or the hoses are faulty.
-Air-injection and EVAP malfunction: If the air-injection system in the engine malfunctions, it won't be able to control the hydrocarbon and carbon monoxide emissions properly
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