Hello,
I have an is220d 08 model. Im having an issue with carbon build up. I had the car fully serviced and the EGR valve taken off and cleaned. The mechanic sent me some pics and it was properly clogged. Even the manifold inlet pipe was clogged. He cleaned the whole lot out and the car changed in how it responded etc. FYI for the better! The service took place in November so it hasnt been that long at all. The issue is, is that im having similar issues to what i was experiencing before I had the service done which is slow take off. Then when i hit 2500rpm it kicks in! But on hills if im in 2nd gear its not going anywhere. So im thinking that the EGR valve is blocked up again and needs a clean.
I will do that this weekend, but wanted to know why it would get clogged up so quickly? The lexus garage (when i took it to them to reset the engine code) suggested it could be the EGR valve cooler??
Any ideas?