S4 V8-4.2L (BHF) (2004)
Ignition Coil: Testing and Inspection
Ignition Coils With Power Output Stages, Checking
Recommended special tools and equipment
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V.A.G 1526A multimeter
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V.A.G 1527 B Voltage Tester
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V.A.G 1594A connector test kit
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V.A.G 1598/31 test box
NOTE: The ignition coil and power output stage are combined in one complete component.
Test requirement:
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Fuses for engine electronics OK
Procedure
Recognize a non-functional or misfiring cylinder as follows:
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Compare spark plugs of 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.