Sno_monsta

That picture is from before the 1st repair, so far no one has honoured their warranty on any of the repairs...

https://www.motorreviewer.com/engine.php?engine_id=118 I would hope you have the 3rd Gen engine.

The spark plugs fitted were Bosch FR7LDC+ with a heat range of 7, a correct fitment should have a heat rate of 5. Would that have made such a huge difference? Oil consumption wasn't too bad ,around a litre for a thousand miles.

The initial failure according to the owner of the garage was carbon build up on the valve, which he said was common for these engines. I have the valve somewhere it looks like it's been spark eroded. I suspected injector failure and the garage who repaired the head even said injector fault on their initial assessment. They might have forgotten in the 4 weeks that it took for them to complete the repairs... I asked for a new tensioner and chain as the head would be off. Owned by me for 3 years, last service May 2019, they have the plug type listed on the invoice, Bosch FR7ldc+ I don't know the reason for cyl 4's loss of compression, they wanted £380 to take the head off and look. I said I'm not spending anymore money, they said you best come and collect it then. Yeti is back home with me, triple cripple.

Within 800 miles of my newly built head. EPC light, engine fault light, display panel mesage: Engine fault! Workshop! Back I go to the local independent garage. They said they were very busy, but within a day told me loss of compression on cylinder 4! And that the spark plugs were not the correct ones, cyl 4 spark plug had burnt it's electrode. As they weren't the ones who fitted the plugs, they're claiming not their problem! The plugs fitted were Bosch FR7ldc+ which look like they're for an older Audi 1.8T engine. If they rebuilt the head, why would they put the old spark plugs back?

I had to have the head rebuilt, 16 new valves, camchain, tensioner etc. Not a cheap month by any stretch!