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A4 (2.8L)

NOTE: When ignition coil is triggered, spark is supplied to 2 spark plugs at one time. One spark plug fires during compression stroke and the other plug fires during exhaust stroke (waste spark).

Connect spark tester to ignition cable and check for a strong Blue spark while cranking engine. Disconnect and inspect all related ignition system harness connectors and terminals. Clean or repair as necessary.

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