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I’ve had my Mini Cooper S for just over a year & have been told it is now a non runner due to carbon on the engine. I’ve had it in & out of the garage since October & they’ve only just discovered that it’s carbon buildup that’s the problem. I need some help with my options aside from giving up on her!
 

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as long as it has not caused the pistons to hit the valves its one of those try the wallnut blast then see what you got after, chances are the cat will be fairly damaged as well from past dealings
 

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I'd find a good independent mini specialist (most towns have them) Anyone worth their salt will be able to diagnose issues properly with some labour costs. Taking months to diagnose that sounds like they haven't got a clue and are guessing.

As mike said, and even if the buildup on the head was so much that valves and pistons have contacted it's still repairable, albeit with a big cost.

All they have to do is whip the inlet manifold off to tell. If it needs cleaning, only bother with blasting, do not, under any circumstances pay for terraclean or chemical cleaning, it just doeant do as good a job, remotely.
 

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I'd find a good independent mini specialist (most towns have them) Anyone worth their salt will be able to diagnose issues properly with some labour costs. Taking months to diagnose that sounds like they haven't got a clue and are guessing.

As mike said, and even if the buildup on the head was so much that valves and pistons have contacted it's still repairable, albeit with a big cost.

All they have to do is whip the inlet manifold off to tell. If it needs cleaning, only bother with blasting, do not, under any circumstances pay for terraclean or chemical cleaning, it just doeant do as good a job, remotely.
that terra clean what a rip off that is, can of seafoam in oil and can in fuel system does a better job, but carbon on inlet valves are pain in arse i use scrape tools and egr cleaner and seam foam even brake cleaner works,, takes me 3 hours ish normally to do the job getting pretty good at using a mirror and a light now,, i close the valves and spray a load in leave for 10-20 minutes then use a dremil and long wire brush attachment and go at it does work really do need to buy a wall nut blaster and start making money off it i guess,
trouble is with diagnosing stuff these engines are very much a mine field and so much can effect it,, i always start with the basics ie if not had a timing chain in last 60k then best to be done first then see what you got , start off at a known good point then
 

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Will this help? It’s in such an awful state 😢
What's the latest situation, Emma?

Not sure if this will help, but my engine was in a pretty awful state, and 2 engine flushes helped sort it out - not sure if yours is too far gone for that, but maybe worth a try, with Seafoam?
 
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