Hello Guys,
I am a newbie to this forum, and although my car is not a lexus - i do have the T180 engine in a corolla verso. I am also experiencing similar problems to Robbies original post, having serious turbolag issues that come and go as they please. I just wanted to add to this post after reading all about there being no diagnostic codes recorded in Robbies situation. If the high pressure fuel pump was becoming blocked/restricted, then i would have expected a diagnostic code to be flagged. The common fuel rail has a pressure/temperature sensor installed in it. Surely if the pump performance was decreasing, the pressure in the fuel rail was not being pressurised to the correct pressure (1600-1800 bar) all of the time - THIS WOULD BE REGISTERED AS A FAULT AND AN ERROR CODE STORED!? Maybe even to the extent that the MIL (engine) lamp would be illuminated.
I am still trying to get to the bottom of my problem - going to start with the MAF sensor and air intake and work from there.
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