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I have a LS400 Lexus thats will start then immediately dies, I've checked fuel pressure and have 40psi, it is not pulling any codes, has new battery, any suggestions?

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  • 133 Answers

Hello,

Does the vehicle rev up to about 2k RPM and then die? Does it do this every time, meaning can you start the vehicle every time but then dies?
Was there any other things happening before or several different things? Example - black smoke out tail pipe, would not hold a steady speed and jerked or hesitated? If you answered yes to these questions it is a good chance the vehicle computer needs replacing. (I had the same issue, different vehicle).

If not, do you have any more information?

I hope this helps!!!

Posted on Jan 22, 2013

  • 2 more comments 
  • kelvin Jan 22, 2013

    Yes it does this everytime, once it starts and dies you have to turn the key off in order to get it to start again. This is my sons car so not sure about history but do know it was running when front tie rod broke and the shop fixed it but when he went to pick up it starts and dies

  • Douglas Jan 22, 2013

    Is it still at the shop? Sounds like the shop is trying to get more money from you.

  • kelvin Jan 22, 2013

    No we picked it up and brought it home on a trailer, I am mechanically inclined so I have checked all that I know just not familiar with Lexus's. Any suggestions welcome not sure what else to check, it fires fine just won't stay running.

  • Douglas Jan 22, 2013

    Chances are its a sensor or the computer. Do you have a volt meter? You can start by finding the 'key on' voltages for the sensors and seeing if they are in tolerance. The Mass Air Flow (MAF) sensor voltage on a Mercury Cougar is 10.5. If you have a book these will be in it.

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SOURCE: battery drain 1992 lexus ls400 replaced battery 3

check alternator

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daves944
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You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

Posted on May 11, 2009

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SOURCE: 1993 Lexus LS400 acceleration stalls or surges

I HAD THE SAME PROBLEM WITH MY CAR. 93 LS 400. THAT WOULD BE YOUR FUEL FILTER OR THE FUEL PUMP GOING BAD. TRY CHANGING THE FILTER FIRST. THE DEALER TRIED TO CHARGE ME $980 TO CHANGE FUEL PUMP.

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terseo
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SOURCE: Car shuts off immediately after starting.

I think you are on the right track with the fuel. Find your fuel to the engine and disconnect it. Put it in a container and crank the engine over. How much fuel comes out? It should be a good steady flow if not you either have an obstruction in the line or a faulty pump. Hope this helps.

Posted on Sep 21, 2009

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


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

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

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http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.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://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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===========





Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.



From start to end troubleshooting these problems I suggest you to check the help link below and follow its procedure: -----


Mostly all types of car no start problems are discussed here with solutions:---

CAR NO START: ENGINE NOT TURNING OVER:

http://alltypesofpartsreplacing.blogspot.com/2012/11/car-no-start-engine-not-turning-over.html

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These will help.



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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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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

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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1 Answer

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http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

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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/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

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://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

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http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

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http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

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===========

These details will help.

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