jagtoes

Ok I'll try to find some info on it. So do I assume that in order to change the air volume (idle speed) the ECM needs to adjust the throttle plate .

jagtoes

OK here is one of the explanations I have found about the Lexus throttle body. Assuming the ES350 has a similar system it appears the throttle plate is adjusted by the ECM to provide the idle speed. So no IAC as used by the earlier version ES300. I guess the cleaning of the throttle plate would be important in this system.

heidihidin

i can confirm that throttle body cleaning performed by the dealer did not resolve low rpm at idle

dmullen137

I've got the same issue on my 2011 ES350 with 55k on the odometer. I've run Redline and Techron FI cleaners through it and had the TB cleaned. I reset the ECU to try and reset the idle. No improvement. I took it to the dealer and spent $200 on a complete diagnostic to find a root cause for the rough idle and they told me all was good.

My fix? Drive around with AUTO selected on the climate control which forces the compressor to be engaged (which adds about 75RPM as the ECU compensates for the additional load) I'm at about 650RPM at a stoplight in D.

It's nice because cold air is always available

I admit this is no fix, but I'm done messing with it. I've spent hundreds of $$ trying to find a fix.

I did read somebody here say that they replaced the Diamond OEM ignition coils with Densos and it resolved the problem....but $60ish x 6? I'll wait until it drives me crazy - which is getting close - or I lose cylinder 6. Then I'll just swap them all out.

Good luck and keep us updated with any findings!

Dustin