My EGR cooler shut off valve leaked smoke. It was sooty around thar area, I could see the haze at night with a green laser pen shining it under the bonnet.
It is a butterfly valve operated by vacuum and whatever the shaft ran it had gone, bearings or whaever leaving it loose in the holes so smoke could escape.
Last edited by snapdragon; 18th October 2018 at 07:36 PM.
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