Question about 1990 Lexus LS 400

1 Answer

Idal to low - 1990 Lexus LS 400

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Lexus Master
  • 85,206 Answers

This problem is caused by a dirty idle speed control valve and throttle valve, do the following procedure i have used for many years to help improve this condition.

To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Nov 23, 2010


1 Suggested Answer

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Idal adjustment

The idle is computer controlled and not adjustable. You may have a intake manifold vacuum leak that is the cause of the high idle.

Jun 03, 2013 | 1988 Chevrolet C3500

1 Answer

Fuilinjection idal adjustment

You might try replacing the TPI sensor

Jun 03, 2013 | 1987 Chevrolet Blazer

1 Answer

I have a Mitsubishi magna 2001 model and I'm having computer problems the battery symbol keeps flashing and it keep stalling and won't idall properly

You need to have the Alternator tested, the battery symbol indicates the system voltage is low. The other problems are due to the low voltage.

Sep 18, 2012 | 2005 Mitsubishi Magna Wagon

1 Answer

The heater will not get warm without pushing on the gas at all times and does not work when idaling.


Dec 10, 2010 | 2003 Buick Rendezvous

1 Answer

My 1991 Sonoma idals low and will not pass emissons

You may have a worn out O2 sensor or catalytic converter. Maybe time for a tune-up?? Is the check engine light on?

May 29, 2010 | 1991 GMC Sonoma

2 Answers

Idaling 1997 2.7 800 +rpm

Turn idle control screw in (mounted on air intake by throttle control) It's recessed into the housing

Jan 27, 2010 | 1997 Honda Accord

1 Answer

Van does not put out heat when idaling or driving sometimes but mostly at idle

check you antifreeze level first off, if it is low you wont have heat as you need coolant running through your heater core

Dec 16, 2009 | 2000 Chevrolet Venture

1 Answer

2006 Dodge 2500 Diesel overheating, heater not working and blows cold air when stopped or idaling

sounds like you got a low coolant problem....any signs of a leak...check the coolant level

Feb 22, 2009 | 1999 Dodge Ram 2500 4WD

1 Answer

Hi idal

Idaling? Where the **** did you go to school.

Jun 05, 2008 | 1987 Ford Mustang

Not finding what you are looking for?
1990 Lexus LS 400 Logo

413 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lexus Experts


Level 3 Expert

85206 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Are you a Lexus Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides