One problem related to loud engine noise has been reported for the 2007 Lexus IS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Lexus IS based on all problems reported for the 2007 IS.
I had Issues when the car starts-up. It make a loud noise every morning going to work and also the a/c makes noises when its on. Took it to Lexus and they told me that they can not duplicate the noise and also say that they found some type of garage in the air filter. The noise Is still there, its a loud thump as if metal to metal impact. Like a steel hammer hitting another steel hammer.