2014 S3 loss of pressure

[Juggo22]

Hi all,
Does any one u’ve any idea ma what the following problem is:
My S3 Epc light came on as car went into limp mode! I made it to an Audi specialist garage, and found that cylinder 1 had a loss of pressure. Garage have taken the head of and said it’s looks as if the cylinder has ha d a foreign object in it and completely ruined it. So they advised I need a new engine. Found a new engine, the garage installed it today and again, miss firing in cylinder 1....I have no idea what’s going on can any one shed any light in this please

 

[rafletcher]

That’s the garages problem surely?

 

[Harvey]

Injector, spark plug, coil pack?

 

[Damo S]

Foreign object in the cylinder sounds like a load of rubbish. A likely scenario is that the injector isnt working properly and the misfires are pre-ignition / detonation due to that cylinder running lean, and they have killed the piston. If they just swapped injectors over then the original problem still exists. Likely: new injector. The garage need to try swapping parts over with cylinder 2 to see if moving them over also moves the misfires to number 2 (injectors, coil pack, spark plug). If the problem still persists on cylinder 1 after that then its either an ECU or wiring loom problem. Your car would have needed a new engine regardless but if they don't get to the bottom of the misfires then they will eventually kill that one too.