Hi Guys


I have recently acquired a 2011 Audi A1 1.6 tdi. The car had a replacement engine in it and just needed finishing off.

After starting the car I have discovered this terrible knock.

I could not figure out where it was coming from. Few said it could be the injectors although it sounded a bit too loud for me to be the injectors but I have sent those out for testing. Turned out 3 out of 4 were bad.

I have purchased second hand ones on eBay and fitted those. Made zero difference.

I thought. Oh well time to strip out the engine and see if I can find anything. Pistons were good. Conrods and big end bearings looked perfect.

At this stage I have decided to go for a second hand engine as I didnt know the full story with the old one.

Here we are now. New engine in and the knock is still there! Not as bad as previously but still there! The only thing that was put back from the old engine was (flywheel,clutch,turbo and all the piping, injectors, fuel rail)

Here is a vid of it now



Any ideas? Could the second set of injectors be also faulty? Would it actually knock this bad?
Any input would be much appreciated.