05 s4 misfires!!

[s4me2kno]

so I have an 05 s4 with 117k that started having random misfires across 5 cylinders. brought it to a shop
that specialized in audi and they told me I needed to update my software so I went from version 10 to version 30.
It basically went from bad to worse after that. misfires got alot worse and it sputters and almost stalls whenever I take it out of gear and
coast to a stop.

they are stumped as to y its doing that and now im getting 10 to a gallon or less.

any ideas whats wrong????

[Tarrant]

Holy cow - I would start with a Seafoam cleaning as a baseline. After that change the plugs and check if coils are all working 100%.

Unhooked intake? Check the intake for leaks, and check your filter too.

[ECS Tuning-Audi]

I would be looking into coil packs, spark plugs, and ignition control modules.

Jason

[gwodark]

so I have an 05 s4 with 117k that started having random misfires across 5 cylinders. brought it to a shop
that specialized in audi and they told me I needed to update my software so I went from version 10 to version 30.
It basically went from bad to worse after that. misfires got alot worse and it sputters and almost stalls whenever I take it out of gear and
coast to a stop.

they are stumped as to y its doing that and now im getting 10 to a gallon or less.

any ideas whats wrong????

Did you replace the coils in the dealer recall? If not, that could definitely be part or even all your problem.

[WildHareMS]

Wish more people who post for assistance with problems would monitor their thread & hopefully replay to inquiries that are meant to assist. lol

[arcamlee]

Sound like an intake cam adjuster...

[WileyBrill]

What Codes is it throwing out? Suspect cat failure, both Banks. If they haven't had the originals replaced, mostlikely they're toast...

[s4me2kno]

sorry for never responding I have a short attention span. turns out the factory version 30 update that was installed was installed incorrectly. also some of the vibration that I was feeling when driving was because my flywheel was getting close to shitting the bed.

thanks for all the responses i really appreciate it.

[jbizzyblox]

your fly wheel being worn was present before poor flash how does this create misfires how does that work ? these cars are finicky !