Hi everyone -
Thanks for the solution. I did manage to pull out the screws after a bit of effort and found that the idle valve was a bit stuck. So, was able to complete the cleaning. And to my delight for the next 15 mins, the car ran as if it was brand new. But now :( since yesterday evening, its returned back to how it was, the idle is still hard (a little better than before), yet the humming sound with the low RPM ( around 750 ) is still there.
Any suggestions on what I should look at? Im the second owner and the previous owner have kept it up to date with servicing, timing belt changes, transmission oil change. But it was more garaged and has about 81K miles on it.
Any clues on what I should be looking to clean / replace to get this idle smooth? Thanks for DIY instructions anyways. Very helpful indeed. Learnt a lot.
2002 Lexus RX 300 - 81K
