I am the owner of a Lexus IS 250 bought it May 2006, it has 20.000 kms and had only one service.
For some time now I am hearing a rattling noise which lasts for 2 seconds when I press the engine start button. The engine always starts so I do not have a starter problem but sometimes this annoying rattling noise is there. An average of 1000 starts I have heard this niose on about 90 starts. Usually when the car has not been used for 3-4 hrs, then I hear this noise but I repeat Its not always its unpredictable. I have recorded the voice as I thiought this would help the Lexus garage to understand whats wrong as it might not do it for 2, 3, 4 days and maybe it wont make the noise when will be checked in the garage of lexus.
Anyone can help?
The problem may be as simple as a loose exhaust mount or a pipe clamp not tight. Your service centre will have to check over the car carefully to find the culprit. This will take time, it would be best for them to hear the noise first hand, but with a little perseverance they will locate it.