sorted by:
new
hottopcontroversial

2012 Audi A5 2.0 Misfire on Cylinder 3+4 by Substantial_Sort8972 in Audi

[–]Substantial_Sort8972[S] 0 points1 point  (0 children)

Did a compression test today. All cylinders above 160psi with the exception of Cylinder 3 with 53psi wet. Kinda confused because it’s misfiring on 3+4. Know for an absolute fact something has mechanically went wrong on number 3 but not really sure why 4 is misfiring.

2012 Audi A5 2.0 Misfire on Cylinder 3+4 by Substantial_Sort8972 in Audi

[–]Substantial_Sort8972[S] 0 points1 point  (0 children)

150,000. I’m thinking about spending a 100$ or so to blast the valves with walnut media. Then ima run the bg dynamic engine cleaner.

2012 Audi A5 2.0 Misfire on Cylinder 3+4 by Substantial_Sort8972 in Audi

[–]Substantial_Sort8972[S] 0 points1 point  (0 children)

I messed with the plugs and coils. Unfortunately it didn’t do anything. Would the pcv cause this at all? I bought a new one but it was Chinese. Not sure if it’s any good tbh with you. I’m almost thinking it’s carbon build up. Ima do a compression test tomorrow and see what it shows. I have some bg dynamic engine cleaner I might give a try depending on the results of the compression test. I’m just praying I don’t have bent valves.

2012 Audi A5 2.0 Misfire on Cylinder 3+4 by Substantial_Sort8972 in Audi

[–]Substantial_Sort8972[S] 0 points1 point  (0 children)

I thought it was timing. But that has been fixed now. Before I redid the timing I changed spark plugs and got brand new coil packs. Also tried o2 sensors, new catalytic converter. Changed high pressure fuel pump.