After reading somewhere on here about how so many people have de-coked the 90` 'mixer elbow' on their D5 engines I thought I'd have a peek this morning and was pretty shocked at the build up. It wasn't as bad as some of the photos I've seen on here, but the small EGR hole at the side was almost closed over!! I cleaned the metal mixer, the two rubber hoses either side of it, the EGR plenum opening and the opening of the inlet manifold. Took a few before and after photos I thought I'd share.
Before:
After:
This is a dead easy job but VERY messy. Make sure you double glove and have a full tin of carb cleaner and a full roll of paper at the ready!!
Been for a brief road test and the car definitely pulls a bit harder but much more cleanly right through the rev range. Others have reported a good increase in economy too though it's a bit early for me to know that yet! Either way though, that much crud in your intake tract can't be good and for ease of the job, it's worth doing all day long!!
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