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?

2 Answers
202,485

Ed92626 answered about a year ago

There are a lot of reasons for a misfire. Is it random or specific to certain cylinders? Could be spark or fuel. Could be faulty sensors, coils, or wires, or clogged fuel injectors. You need diagnostic skills rather than just looking at the obvious.

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307,255

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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