Has anyone experienced slight vibration at idle with the ac on ranging from 780-825rpm n causes shaking. Don't remember it ever doing it before. Also once I off the ac it goes away. Also the car started dropping rpm a little when slowing down.

 

My car vibrates alot when i have the A/C on too but I started noticing that this year. it doesnt vibrate when off too. Not sure if its normal this car does have alot of vibrating problems... Well the car should drop RPM's when slowing down as long as you're not under 700-600 you should be fine....

 

Vibrations like that a usually due to mounts starting to wear...maybe not broken but becoming hard.

 

If it's an 06 GS 300 it's probably carbon buildup. And either the end of your car or a $6300 repair bill for new piston rings. And eventually you'll still have the same problem.

 

It's a 07 gs350 all maintenance has been performed at the dealer so shouldn't be carbon build up cuz it was performed on Lexus recommendation. It drives perfectly fine it's just when the car is coming to a stop it hesitates a little because of the way the car downshifts and it doesn't have no ticking either. So that's what got me confused.

 

- Gs 350 dont have the carbon build up issue... Well from what I heard of...
- Have u flushed the tranny? I haven't flushed mines and its been having rough shifts up and down... but its only gears 1-3.... Also could be solenoids anybody know? Does resetting ECU ( removing negative battery) work?

 

If it vibrates when a/c only that means the compressor is putting to much load on the engine. A lot of times because of dirt buildup between the radiator and condenser, easy fix, spray it out with a garden hose and some good pressure. Hit the front of the condenser first, cleaning the fins real good. Then the front side of the radiator as best you can. For best results blow out the fins with compressed air to finish

 

hmmm I'll try this when i got time... Where is the condenser? Isn't spraying water on the engine bay really bad? What if I have the broken cabin filter door?

 

The condenser is right behind the grill/front bumper and the radiator is right behind that, there's about a half inch gap between the two that should be cleaned once in a while. Just don't have the engine running and you shouldn't have any problems

Be sure not to bend any of the fins on the condenser or radiator, as we are trying to increase airflow through the two, and flattening these fins will do exactly the opposite and could cause poor a/c performance and even overheating, good luck.

 

i will try to clean it out tomorrow and see of it makes a difference. thanks everyone. if not i may just live with it lol

 

This just be how the car behaves after age? I have done mass airflow cleaning throttlebody Cleaning had the transmission flushed replace serpentine belt idler pulley and tensioner pulley all of this at 100k it fixed little bit of the vibrations but not fully whenever I come to stops I still get these vibrations and I’m just trying to pinpoint what it is and get the part replaced whenever I can but like I said the pulleys and belts did help a little bit.

 

More likely motor/transmission mounts. If you replace them, use oem, and replace all three at once.