Question about 1995 Lexus GS 300

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Driving on highway and my lexus gs300/97 suddenly ran hot and now it wont start, what could be the problem?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

mkv0525
  • 358 Answers

SOURCE: 2001 Lexus GS300 with an electrical problem

sounds like you may possibly have moisture in your fuse box in car.or a pin fit connection problem.

Posted on May 21, 2009

inchandrew
  • 2 Answers

SOURCE: Car wont start

change the battery, than try if not, buy a new car

Posted on Jun 21, 2009

  • 1 Answer

SOURCE: 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.

Posted on Jul 08, 2009

  • 811 Answers

SOURCE: 1995 lexus gs300 wont start. It turns over slowly

check if fuel is present, check for spark, make sure battery is fully charged

Posted on Sep 20, 2009

  • 163 Answers

SOURCE: I have a 1999 Lexus GS300. When trying to start

sounds like the pump and i think on moust lexus and toyota pump is in the gas tank under your back seat

Posted on Jan 02, 2010

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It appears that you have lost water and over heated the motor. The systoms you describe are what happens when an extra hot engine starts to seize the pistons in the bore. Cooling down allows the engine to restart but the noise comes from broken rings and aluminium being removed from the sides of the pistons. If you have an EFI car the cpu unit is probably limiting the engine revs just to get you to athe nearest service place.I suspect you will need a replacement engine

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Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.


Also it can be weak battery or starter.


But possibilities are to be inspected to confirm what exactly it is.------


To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------


Click the link below:------


1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?


http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

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http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

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http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These details will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

95 lexus ran hot while driving.car cool off . engine will turn over but will not start


How hot for how long? Aluminum heads on this engine are very easy to warp if overheated. You can start of by checking your oil dipstick. If you have frothy milk chocolate colored oil or foam, you have water in the oil. This would be a sure sign that you have warped a head, cracked a head or cracked an engine block. Check your coolant, if there is oil in the antifreeze it means the same thing. Check these items out and then repost. It could be something else.

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Sounds like a bad head gasket

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