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Based on that the D40 doesn't have a boost control solenoid post 2010, I suspect not.
Hi thanks for that, I've got the turbo lag and plumes of black smoke going on, reading threads I thought I would try the boost solinoid but it seems I'm wrong on that! The seller who I bought the replacement soliniod from says the part in my image is a EGR VACUUM CONTROL SOLENOID, could this cause turbo lag?
 

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Worst case it is the electronically actuated boost controller, post 2010 this was part of the turbo, expensive to replace.

Plenty of other things could cause black smoke, the EGR is one of them.
 

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I'll clean the MAF in the morning, I hope I'm not having to go down this road https://www.nissan-navara.net/27-questions-answers-d40-diesels/104307-no-boost-black-smoke-

overfueling.html#/topics/104307?page=3
Have you checked the inter cooler pipes or the inter cooler are not leaking air ie are you getting expansion in the rubber hose on acceleration. That would be my first check rather than looking for expensive answers. usually any thing else will throw a fault code.
 
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