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Hi, about the 2006 Avensis 1.8 Petrol - Engine roughness did you able to find what was the issue? Cause I have absolutely the same issue and no one can figure it our from where it comes this vibrations.
Hi, sorry for late reply, been having intermittant trouble with internet and just saw your post.
I didn't clean or replace the oil control valve, as I am selling the car I haven't bothered, but after speaking to mechanics at a few garages, it very well could be the oil control valve. They all recommend changing, not cleaning as cleaning very seldom works.