What is causing misfire?

Asked by Steven Apr 06, 2023 at 11:16 AM about the 2004 Audi A4 3.0 quattro Sedan AWD

Question type: Maintenance & Repair

My 2007 Audi Ar 3.0L still misfires after replacing all sparkplugs.  Could it be the ignition coil harness?

1 Answer
310,265

Gene answered about a year ago

An 04 Audi could be any number of things, first thing get the codes, if it shows a specific cylinder misfire then test for a vacuum leak on that particular cylinder intake runner, injector pattern and a dry and wet compression, if all that checks out then you have an engine problem, like a cracked cylinder head, valve problem, piston burnt.

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