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Audi
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1990
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100 Base, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/O Codes
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Symptoms
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AFTERBURN In Exhaust System
AFTERBURN In Exhaust System
Ensure there are no leaks in exhaust system.
Ensure base timing system functions correctly.
Check fuel injectors for leaking.
Check cold start valve and thermo time switch operation.
Check coolant temperature sensor.