Question about 1990 Lexus LS 400

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High idle does not come down - 1990 Lexus LS 400

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  • wwatson356 Apr 20, 2009

    The idle is fine when sitting in the driveway in park but will advance to 1200rpm when coming to a stop while driving and in gear. The idle will return to 650rpm in approximately 45 seconds after the car is taken out of gear while stopped. Then continues to repeat the 1200rpm when stopped and in gear while driving. Any thoughts anyone?

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BAD IDLE SPEED CONTROL .the idle on this car's idle is controlled by the computer. Unless you have an accelerator cable is hanging up/stuck

Posted on Dec 30, 2008

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Posted on Jan 02, 2017

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High idle at start up 2200rpm then slowly drops but always seems high have to ride brakes to stop


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My van is idle high i cleaned the throttle boady and it idle down the a few hours later its high idle again why i replaced two sensor and still idle high


Hi Alexandra, Im AL the owner of Big As Auto Repair

There are several things that can cause high idle, but the 2 most common problems are as follows.

(1) You could have a vacuum leak somewhere on the engine. Here is how to check for that issue. Here's what I want you to do: Buy a can of CARB Cleaner and while the engine is running spray around the Intake Manifold, the manifold is the thing the throttle body sit on. Also spray around all the vacuum line as well. If while spraying there is a change in the idle speed then you have found your leak. If there is no change then move on to step 2.

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Hope this helps and should you need further help please visit my auto repair website. http://www.bigasautorepair.com/

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http://www.justanswer.com/toyota/1ktck-92-93-toyota-camry-fast-idle-turn-down-oem.html

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