Brief Rattle or Knocking Noise on Initial Start Up on Lexus GS350

A brief rattle or knocking noise may be noted on initial start up. Our technicians tell us if the noise is determined to be coming from the timing chain area, there are updated variable timing gears available to correct this issue.

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Average mileage: 81,014 (43,000–130,000)
3 model years affected: 2007, 2008, 2009
19 people reported this problem
9 people shared problem details
2007 Lexus GS35074,000
Rattle every once in awhile when I start the car. It sounded like a loose heat shield to me at first, but it only happens once every 7-8 starts...seems to happen most when I start up the car in the morning, or after it sits for more than 12 hours without a start. I have heard this is a problem with the cam gears and that there is a service bulletin for this issue, but I am wondering if it would be covered for me since the car is out of warranty?
2007 Lexus GS35070,000
Every now and then, when I go to start the car I hear a rattling noise. I noticed it started happening at about 70k miles, it still does it now. I was a lil surprised to be hearing these type of rattling noises on a Lexus on start up, only happens when I go to start the vehicle. I do hope they can fix the problem. A lil annoying to say the least. So, is there a recall on this rattling on start up. I've had my car in several times for recalls, but they haven't addressed this rattling noise. If there is a recall on this problem, I hope someone contacts me, before I get into an accident, because of this. Jarrod Moses.
2009 Lexus GS35050,000
Brief rattle sound at cold start
At the start, there is an unexplainable knocking sound.
It is intermittent. Seems to happen more often when starting "cold" after the car has been sitting several hours in hot weather.
2008 Lexus GS35043,000
It doesn't happen every time but occasionally after my GS350 has sit over night it makes a rattle type noise when it first starts up.
Brief rattle upon iginition. Wont happen if I turn car off then turn on right there. Only after car has been off for at least 8 hours.
2007 Lexus GS35044,000
There is a brief rattle heard upon startup intermittently.
A brief rattle noise when starting says they can't duplicate. But it sounds like bearing tome
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