andru1313

Ok had my carbon clean done a month ago... After car is cold and sits I have been getting a misfire code. p0300, and misfire in cyl 5 and 6. p0305.p0306..
I changed all my spark plugs same issue. I did notice i have the old version of coil packs. I replaced coil pack on cyl 5 and 6 and still having issue. I just replaced coilpack on cyl 1 ( i am going to see if I can get all mine replaced under recall)

Am I going down the wrong path here? Sometimes when the car starts the CEL will blink at idle then go off. Other times it will blink and stay on. I then have to clear the code. The code is always the same, the 3 above....

What more should I be looking at? Should I add the G17 Fuel additive? Could this be a fueling issue? Any input would be great thanks.

ginch73

Pretty much guarantee you have leaking injectors! I had the exact same issues. Have your dealership run an injector pressure test. It will tell you which injector isn't holding pressure. I had 3 that were leaking but decided to change all 8. No issues since!

andru1313

Thanks.. UGH not what i wanted to hear.. Those injectors are not cheap..

andru1313

Well just booked an appointment at the dealer for next week. Not looking forward to hearing what they say..

Datadatum

For those more knowledgeable than I:

Does running injector cleaner help at all with injectors lasting (not leaking), or is the failure mode unrelated to buildup?

Mike9999

just wondering what the results were.

Reggie

ditto

DrCondor

As i have noted previously, there was at least one Required Vehicle Upgrade (RVU) for cold start misfires. Accordingly, ask your dealer to check on this (and other) RVUs.

I am told that most dealers simply perform RVUs during standard maintenance visits, and don't always advise the owner that they have done so.

FWIW.

Newtdog73

I think I paid 75 buck for one. It is an easy fix and you can do it yourself. If you have a VAG it will tell you which one is bad and then just replace it.

ELEVENS

I'd run injector cleaner for a few tank fulls and see what happens. Actually, I already do! Been doing that for years and years. Sure it's indodotal evidence, but I've never had an injector fail. But I use it mostly for the purpose of combustion chamber scrubbing in the RS4. 25ml every tank of fuel. IIRC it costs around $50 per gallon, which lasts 3 years or more. Cheap peace of mind.

http://www.renewablelubricants.com/p...onditioner.pdf