My 99 had a full tune-up at the dealers about 6000 miles ago now it's running rough at idle (in gear). Not drasticaly but you couldn't even feel it running before, it ran so smooooth. Any ideas what could have happened before I take it down to the $Dealer$ ?

 

I am starting to have this issue too and more with warning lights, see this thread:
https://www.clublexus.com/forums/sho...hreadid=109739

 

Has anyone figured out and or fixed the engine vibration problem at idle under a load?

 

You ask about engine idle problem and in same sentence mention "under load"...

Please explain how car can be at idle and under load???????

Thats like coasting uphill..>?

//Fern

 

Quite easily it can be in gear with your foot on the brake

 

I noticed the same problem as well, when i stopped at a junction,while still engaged on 1st gear (auto),the engine vibrate sound can be felt,more than when the transmission is in neutral position.

Is there any adjustment to be made to reduce it?

Kelvin
2000 Rx300

 

Has anyone figured out and or fixed the engine vibration problem at idle under a load?

You ask about engine idle problem and in same sentence mention "under load"...
Please explain how car can be at idle and under load???????........FERNS GOOFY RESPONSE
Thats like coasting uphill..>?

Quite easily it can be in gear with your foot on the brake

I noticed the same problem as well, when i stopped at a junction,while still engaged on 1st gear (auto),the engine vibrate sound can be felt,more than when the transmission is in neutral position.

Is there any adjustment to be made to reduce it?

Kelvin
2000 Rx300

 

Well, i took the trouble to speak to my mechanic. He said to check on 2 things. One, he want to know if your idle speed (in neutral) is too high. Second, get someone to check out your engine rubber mounting.

He will look into my car today. But mine only run 25000km. fairly new.

 

Kelvin,

my response was not meant to sound GOOFY. I was just trying to explain that your question did not seam clear.

When you said "vibration at idle under load", did you mean, ie: car in drive and foot on brake?

If that is the case, my car also has a slight vibration when engine is cold and foot on brake while in drive and stopped at light. More noticeable if I have used lower octane fuel.

 

there is some misunderstanding here,I am Kelvin,and i didnt make that statement. That guy above must have copy and paste ... thus incld my name there.

I agree,what u said is correct,how can it be idle yet under load.


Kelvin
2000 RX300

 

I noticed this too just before I tightened the nuts holding the rubber mount on the right side of my car. No more vibration.

 

One more time...If the engine is running (even at idle) and you have it in gear with your foot on the brake..it is under a load. The car wants to move forward and you are not allowing it...thus it is under a load, granted not a tremendous one but a load all the same.

 

Turing on the A/C compressor will also add some additional load at idle.

 

Lexmexico,

What is the recommended idle rpm for RX ?


Kelvin