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I have a 98 Lexus gs300. When I start the car it starts normal but when it starts to idle it just shuts off. I have changed APP sensor, TPS sensor, MAF sensor, new fuel pump, filter and strainer. Can't seem to figure out the problem. Not throwing any codes at all.

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  • Cars & Trucks Master
  • 14,036 Answers

Idle speed too low.could have faulty spark plugs or wires.faulty fuel injector.worn timing belt slipped time faulty ECM.have vechicle code scan before buying new parts.

Posted on Jul 10, 2013

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Posted on Jan 02, 2017

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tripletauto
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SOURCE: 2000 Ford F450 with V10

have you cleaned the throttle plate? this is done by removing air intake hose and spraying out with cleaner and wiping it down open throttle and wipe off the butterfly and bore. this will usually cure a stumble.

Posted on Aug 20, 2008

  • 574 Answers

SOURCE: 94 ciera 3.1 new fuel

May have a vacuum leak somewhere these are sometimes hard to find. Start at the throttle body should be a couple lines there look for holes,cracks in the lines at throttle body and continue down the lines.

Posted on Sep 11, 2009

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1994 gs300 high idle when warm


check the TPS sensor and circuit

May 25, 2017 | 1994 Lexus GS 300

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Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...

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What is the problem if my 94 lexus es300 will crank and run but if you press the gas it shuts off


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Aug 24, 2014 | Lexus ES 300 Cars & Trucks

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We have a 1993 Lexus gs300 it won't start, ran great when it was turned off has plenty of fuel, turns over fine.


Try check the engine control unit.. It's located at passenger side under the plastic cover food step side wall.. I repair more then 30 units of this GS300 n ARISTO all with the ECU failure if check everything with the engine n sensor.. Also check if there is fuel supply coz some model build with hi-low fuelpump control module.

Feb 17, 2013 | Cars & Trucks

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I have a 1994 gs300 and my engine light stays on. It idles a little high on a cold start for about 1 minute then its fine but the light stays on. Does the erg system have a filter that could be causing...


High idle is expected because of settings the coolant and air temp sensors set up with the computer. "cold start choke" The light coming on can be contributed to a rich fuel mixture that lasts too long. The 02 sensor picks that up and triggers the light. So, Your engine coolant sensor may well be the problem.

Sep 28, 2009 | 1994 Lexus GS 300

3 Answers

98 lexus gs300 codes p1120 p1121


I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)

My symptons were:
VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).

During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would start...it happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.

The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from RockAuto.com (exacly same part toyota OEM)

THE PART THAT FIXED THE PROBLEM:
===========================================
"Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.

The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.

I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.

GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.

The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.

Nov 23, 2008 | 1998 Lexus Gs 300

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