Audi s5 b8 2009 misfire cyl 1 idle

[Valentin]

Hi,

I come here to have some help and information. I have Audi S5 2009 B9 TIPTRONIC. I have misfire than more few month only on Cylinder 1 and only under 1100RPM. I can feel the misfire at idle and I can see with my vag com and I have check engine light and Misfire cylinder 1 misfire code P0301.
I made compression test all my cylinder have 12 bar (perfect engine condition from Elsawin)

I go to the Audi dealer and after 3 month and after changed engine ecu, swapped spark, coil and injector,..) after make compression test (perfect too) he send to me 2 invoice : 1- Change bottom complete engine 25000 euros 2-replace entire engine 26000euros..

Anyone can help me because for me its impossible to have dead engine if all cylinder have perfect good compression… and run perfect for driving. The symptom is only at idle and cold warn its better and no misfire and no check engine light..

Regards

Topic

[college man]

Has good spark and fuel been verified to that cylinder?

[Valentin]

all good. New spark and new injector.

[Valentin]

HELLO. I am back.

Today performed cylinder leak down test on cylinder 1.
And result is approx 5% leakage so seems to be good.
Link to the test video : https://youtu.be/gGSIiFQBosI

This problem make me crazy 1 years…
please help me !!

[Valentin]

My problem is uncommon ? Because I don’t have any professional idea 🙂

[Valentin]

It’s hard to find. I am only one have this ?

[Paul Lynch]

Hello,

Did you get to the bottom of this? I have the same issue with my V8 RS5, misfire only at idle on cylinder 1!

[Author]

Replies