supags

Hey I'm a new owner owner with 1500clicks 2006 rwd gs300 and today when I was driving and i stoped at a red light. The car seemed to vibrate on idle and the rpm would slightly go up & down.

sosoguju

Could be something simple like bad gas, did u fill up at a different place than usual? Premium or regular?

lexus ASM

Totally normal, vehicle's idle is dropping because the radiator fan is kicking on and putting a hefty draw on the electrical system, rpm shift has to with fan kicking on and off.

Also when the idle drops you feel the vibrations better because they are further apart.

supags

I have been putting Premium since i bought the car..but i don't know it never done it before just sometimes it feels its vibrate doesn't seem or sound so bad just wondering..but yeah the rpm does jump alot i seen..not like my old car maxima..lol

passnu2

iTrader: (33)

may not hurt to check your MAF, intake filter, and your throttle body to make sure they are all good.

lexus ASM

Your old maxima has fairly low compresion in comparison to your GS. Each time there is ignition you can feel the bang. Thats the vibration.

Go and sit in another GS3*0, you will feel the same thing. I did this with a customer for 4 cars before he conceeded. I wouldn't compare a car with direct injection and high compression to one thats not.

Unfortunately the days are gone of being able to balance a dime on your valve cover at idle. Fuel efficiency and EPA requirements have changed the direction of Lexus's pursuit.