A4 Quattro Wagon L4-1.8L Turbo (AWM) (2001)
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Remove engine cover (arrows).
Recognize a non-functional or misfiring cylinder as follows:
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Check misfire recognition. See: Testing and Inspection
If misfires were recognized:
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Continue with test at indicated cylinder "If faulty cylinder is recognized".
If no misfires were recognized:
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Disconnect connectors from fuel injectors in sequence with engine running and observe engine operation.
or
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Compare spark plugs from all cylinders to each other. Check electrodes for carbon fouling.
If faulty cylinder is recognized:
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Switch spark plug from faulty cylinder with one from another cylinder.
If malfunction follows the spark plug:
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Replace spark plug.
If malfunction remains at original cylinder:
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Switch ignition coil from faulty cylinder with one from another cylinder.
If malfunction follows the ignition coil:
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Replace ignition coil.
Check Ground (GND) connection
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Disconnect the 4-pin harness connector -1- at the ignition coil -2-.
