Thanks for your response. Toyota tell me they checked the valves, and found no problems there. Have a meeting with them next Wednesday so will bring your suggestion up. The problem has been there from new, and a few alterations I have had done have not changed this. One of these is to put a block off plate on the EGR with a 10 mm hole to equalize pressure. I had read up that this could affect the amount of carbon being sent back into the intake, for emission control reasons, but which are not beneficial to the running of the engine. It surprises me the amount of carbon generated in the EGR, which would indicate inefficient fuel burning? Appreciate your interest, and will place more information if useful after my meeting.
Friday, October 23rd, 2015 AT 2:47 PM