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
202,345

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.

1 people found this helpful.
Mark helpful
307,235

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.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • What is causing misfire? 2 Answers

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

    2004 Audi A4 3.0 quattro Sedan AWD

    -

    Maintenance & Repair

  • I have a misfire what is wrong? 4 Answers

    2011 a4 Quattro misfire and white smoke

    2011 Audi A4 2.0T quattro Premium AWD

    -

    Maintenance & Repair

  • Misfire at idle 1 Answer

    Deathjam, i have a 2009 audi a4 2.0t quattro. Car would have trouble starting sometimes and when starts it bogs out. Didnt have the time to really mess around with it. Then i did a topend seafoam ...

    2009 Audi A4 2.0T quattro Premium Plus Sedan AWD

    -

    Maintenance & Repair

  • What is wrong 1 Answer

    I have a 1.8. I was just driving it and I heard a loud noise I pulled over I'm by the time I pulled over I heard a loud bang and the car has never crank back up what could that possibly be.

    2000 Audi A4 1.8T Sedan FWD

    -

    Maintenance & Repair

  • Misfire codes 1 Answer

    I have a 2007 Audi A4 2.0T with an FSI engine. Codes P0300, P0302 and P0304 pop up indicating a misfire on cylinders 2 and 4. I replaced all spark plugs and all ignition coils and have even moved ...

    2007 Audi A4 2.0T Sedan FWD

    -

    Maintenance & Repair

Shortcuts

Search Audi A4 Questions

CarGurus Experts

  • #1
    Deathjam4
    Reputation
    13,160
  • #2
    lukeyramone
    Reputation
    1,370
  • #3
    James III
    Reputation
    1,220
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used BMW 3 Series
59 Great Deals out of 1,213 listings starting at $2,500
Used Audi A6
7 Great Deals out of 117 listings starting at $5,600
Used Audi S4
90 listings starting at $17,000
Used Audi A3
11 Great Deals out of 375 listings starting at $5,499
Used Mercedes-Benz C-Class
74 Great Deals out of 1,399 listings starting at $3,500
Used Honda Accord
47 Great Deals out of 974 listings starting at $2,995
Used Lexus IS
23 Great Deals out of 426 listings starting at $4,400
Used Honda Civic
188 Great Deals out of 3,999 listings starting at $440
Used BMW 5 Series
24 Great Deals out of 302 listings starting at $5,299
Used Toyota Camry
47 Great Deals out of 1,118 listings starting at $2,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.