I took the egr valve off, hoping to see it carboned up. It didn’t seem to be, so I just periodically sprayed egr cleaning spray into it and where it attached to the engine. Had a little play with the valve and sprayed in there too. Left it overnight in a bit of a pool. Refitted with a new gasket and it seems to have cured the judder. I’ll not get too excited as I’ve read that it could soon return.
I’m getting into this diy car repairs.
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