SOURCE: 1993 Lexus Ls400 loss of power at 2500-3000rpm
Check your MAF and MAP sensor. The first 80% of your throttle signal from the TPS works with the O2 sensor to try to keep the air fuel ratio to 14.7 to 1 with the ECM controlling the fuel injector spray time and timing the ignition. After the 80% to WOT the ECM puts the O2 sensor in to an open loop and takes the Reading form the MAF and MAP sensor to run the engine richer so there will not be any Detonation to the engine and burning holes in the valves for running too lean. That is why it always feel like you get a little more when you ease off on the gas peddle from WOT. Recap check the TPS, MAF,and MAP sensor and wires to those sensors, if you can get the car scanned that would be great and you may find out which sensor may have gone bad, the other thing to is the fuel pressure regulator may be going bad and at WOT the pressure may be to high causing it to run to rich causing the loss of power. Good luck and hope this helps.
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.
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.
SOURCE: 1993-lexus ls400 instrument cluster
WE ARE AN AUTO REPAIR SHOP IN ROCK HILL SC. WE HAVE RUN INTO THIS PROBLEM BEFORE. WE CAN REPAIR THIS, PARTS AND LABOR APPROXIMATELY 625.00, WITH A 12/12 WARRANTY. CONTACT EAST COAST PERFORMANCE AT 803-329-3868
SOURCE: how to change the fuel pump on 1991 lexus ls400
remove rear seat then remove cover in the trunk, you will see a cover remove thatcover and remove 8 bolts holding fuelpump in tank,also dissconnect connector to fuelpump with bolts removed the pump pulls right out.hope this helps.
To
troubleshoot the issue, click the link below:
Car Repair Diagram
http://technoanswers.blogspot.com/2013/03/car-repair-diagram.html
-------
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
===========
These
details will help.
Thanks.
HOT/WARM START ISSUE
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
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:------
http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html
-------------
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
------------
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
-----------
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These
details will help.
Thanks.
http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html
------------
1995 Lexus LS400: Running Hot?
http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html
------------
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
------------
Multiple problems on car: Car runs hot, A/C
blows hot and car starts surging?
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html
--------------
Delay starting on Toyota Prius?
http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html
-----------
Honda car will not start intermittently?
http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html
--------------
Vehicle
Starts, Runs and Loses Power
http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html
--------------
Intermittent starting issues on Volvo 760?
http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html
-----------
Car starts and cuts off immediately?
http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html
-----------
Car won't start when cold?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
===========
These details will help.
Thanks.
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