Lexus ES300 Massive RPM - idle?

Alex777 · 10-24-2009, 07:49 PM

Hello everyone!

I'm seeming to have trouble with my car. When I start it up and it's in park the RPM is unstable and is usually at 2000, when I put the car into Drive it goes back to normal of about 1000.

Car: Lexus ES300 2001.

Any help would be appreciated, Thanks!

**octaneman** · 10-25-2009, 05:42 AM

Hi Alex777

Check for codes that the computer may have picked up and please post them. By your description, the probable cause is the engine has a vacuum leak or a bad TPS sensor.

Alex777 · 10-27-2009, 06:23 PM

I replaced the TPS sensor and checked for vacuum leaks, and the computer doesn't throw out any codes.

Any other possibilities?

**octaneman** · 10-27-2009, 07:22 PM

Check the IAC (idle Air control) it maybe stuck from carbon deposits. The IAC on the Lexus is located under the throttle body. There are 2 hoses that block access ,disconnect them and then remove the 2 screws on the IAC. Once the IAC is out use decorbonizer spray clean the IAC and spray into the hole also to break up the deposits inside, also clean out the throttle plate. Reinstall everything and re-check the idle.

post back your findings.

10-24-2009, 07:49 PM	#1 (permalink)
Alex777 Registered User Join Date: Oct 2009 Posts: 2 OS: windows xp 3	Lexus ES300 Massive RPM - idle? Hello everyone! I'm seeming to have trouble with my car. When I start it up and it's in park the RPM is unstable and is usually at 2000, when I put the car into Drive it goes back to normal of about 1000. Car: Lexus ES300 2001. Any help would be appreciated, Thanks!

10-25-2009, 05:42 AM	#2 (permalink)
octaneman Mentor Home Support, Gearhead Automotive Center Join Date: May 2009 Posts: 548 OS: WINXP	Re: Lexus ES300 Massive RPM - idle? Hi Alex777 Check for codes that the computer may have picked up and please post them. By your description, the probable cause is the engine has a vacuum leak or a bad TPS sensor.

10-27-2009, 06:23 PM	#3 (permalink)
Alex777 Registered User Join Date: Oct 2009 Posts: 2 OS: windows xp 3	Re: Lexus ES300 Massive RPM - idle? I replaced the TPS sensor and checked for vacuum leaks, and the computer doesn't throw out any codes. Any other possibilities?

10-27-2009, 07:22 PM	#4 (permalink)
octaneman Mentor Home Support, Gearhead Automotive Center Join Date: May 2009 Posts: 548 OS: WINXP	Re: Lexus ES300 Massive RPM - idle? Check the IAC (idle Air control) it maybe stuck from carbon deposits. The IAC on the Lexus is located under the throttle body. There are 2 hoses that block access ,disconnect them and then remove the 2 screws on the IAC. Once the IAC is out use decorbonizer spray clean the IAC and spray into the hole also to break up the deposits inside, also clean out the throttle plate. Reinstall everything and re-check the idle. post back your findings. Last edited by octaneman; 10-27-2009 at 07:24 PM.