Cold starting = loud motor??
 

My '07 GS350 is new to me(bought it in early November). It does not get driven much but, I've noticed that when I first start it and drive it a few miles, the motor is incredibly noisy. Once it warms up, it seems to quiet down. Curious if that is the norm with these 3.5L motors or what? Mine has had the valve spring fix by the dealer before I bought it but, just seems real noisy at startup. It runs great just noisy...

Thanks,
Todd

It could be the Cam gears. I just complained about a noise at my 35k service and they replaced the Cam gears under warranty. I believe there was a TSB on it. Good luck.

Shane

Hmmm. I guess I'll have them keep it overnight so they can start it cold and listen the next time it goes in for an oil change.

Thanks,
Todd

I did some research on the cam gears and from what I can tell, when they are problematic, they would cause the motor to remain loud. Mine is only what I cousider loud at start up and for the first few minutes and then it is fine.

Any others?

Thanks,
Todd

Same 07 gs350 AWD, cold start you can hear the injectors, after a while it all clams down and its smooth as butter after that.

I have an inside noise at the first startup of the day. It's a grinding sound when I press the start button - very annoying. It ends almost immediately, but it's very 'non-Lexus'.

How cold is it where you live OP? Anything below 40* F and the engine will rev high until the engine temp gets to 40% (between L and H). Rev high meaning about 1000-1100 RPMS while sitting at a light and 600 is normal.

It is normal for every car, unless you get the hybrid car.