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Volkswagen
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1991
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Jetta L4-1984cc 2.0L DOHC
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Engine
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Tune-up and Engine Performance Checks
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Air/Fuel Mixture
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Locations
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CO. Tap
CO. Tap
The CO Tap is a small pipe attached to the exhaust manifold which provides a place to connect a CO meter during testing. The pipe is about 8 in. long with a blue rubber plug on the end.