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The only place for a coil spring is up Zebedee's arse
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I was at a barbecue yesterday with some other car enthusiast folks, and one of guests mentioned that their Focus TDCi was smoking pretty badly. So of course out came the tools.

Apparently it did have a new turbo a while ago and although it goes okay the exhaust is very smoky. Now one of the things we noticed almost immediately is that coming off boost there's a hell of a flutter from the turbo - I mean real "because racecar" stuff. The other thing was that even at about 2000rpm the soft flexible hose from the compressor to the intercooler had blown up like a beachball!

We're thinking that the first thing to try is having the intercooler off and wash out any accumulated oil and crud - the air filter is pretty oil-contaminated and doesn't look like it's been changed for ages and there was oil lying in the filter-to-compressor pipe, but nothing ridiculous.

Any further thoughts?

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First thought is set fire to it, it's a focus,,,, on a serious note, check the egr valve, they can cause the smoke,, check engine breathers and clean the maf. Upon searching seems that a lot have the expanding pipe syndrome ! Make sure pipe connections are well sealed, 1 guy said remove pipe, clean and spray hairspray inside at both ends where it connects to inter cooler etc