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Lexus LS400: Lexus 1991 LS400. When cruising in OD at about
Lexus 1991 LS400. When cruising in OD at about 1000 to 1200 rpm when I let off the accelerator slowly the engine will have a sudden drop of about 200 rpm feeling like a switch just turning the engine … read more
Chris (aka - Moose)
Chris (aka - Moose)
Technician
Vocational, Technical or Trade School
345 satisfied customers
Lexus LS400: I have a bucking/surging problem on my LS400 93
I have a bucking/surging problem on my LS400 93 model. In park/neutral it revs fine, will spring to red line as i would expect it to. When in drive if i slowly bring the revs up it will get up to abou… read more
LexusPro
LexusPro
Master Automotive Technician
1,002 satisfied customers
1992 lexus ls400. Surges/jerks when driving. RPMs fluctuate.
1992 lexus ls400. Surges/jerks when driving. RPM's fluctuate. Idles high most of the time, drives by itself without accelerating, very poor gas mileage!!!! What's wrong??? I already changed the air fi… read more
HondaPlatinum
HondaPlatinum
Vocational, Technical or Trade School
25,572 satisfied customers
94 ls400: at about 2000 rpm it starts stumbling..new fuel pump
94 ls400 at about 2000 rpm it starts stumbling. sounds like its running outta gas. new fuel pump and filter. nice smooth idle. tried different tps and no luck. pulled the plugs and they were all black… read more
LexusPro
LexusPro
Master Automotive Technician
1,002 satisfied customers
my 1994 lexus has a slow hesitation when starting of from first
my 1994 lexus has a slow hesitation when starting of from first gear all other gears seem fine. I have to push the pedal longer than normal it seems like the cars speed is slowly picking up to the eng… read more
LexusPro
LexusPro
Master Automotive Technician
1,002 satisfied customers
1993 lexus ls400: The car has 96K miles - underdriven for sure
I have a 1993 lexus ls400. The car is in near perfect shape. The car has 96K miles - underdriven for sure. Last week when I was driving it, the tach started to "jump" around. The engine was NOT changi… read more
HondaPlatinum
HondaPlatinum
Vocational, Technical or Trade School
25,572 satisfied customers
1992 Lexus ls400: jerk..accelerator..back down..fuel pump relay
i own a 1992 Lexus ls400. Recently it wants to jerk and decelerate like it's not getting any fuel.You can pump the accelerator and it wil rev up and idle down below 1000, then rev up again and idle ba… read more
LexusPro
LexusPro
Master Automotive Technician
1,002 satisfied customers
93 Lexus LS400: idling..you tilt the sunroof on highway..passenger
occassionally my 93 Lexus LS400 while idling fine will suddenly cut off.After that its difficult to start,doesnt idle on its own,and has very little power.Its like it has went into a limp mode.Fuel mi… read more
lexpert
lexpert
Lexus Master tech
Vocational, Technical or Trade Scho
2,100 satisfied customers
90 Lexus LS400: original owner..Runs great..Intermittent..high speed
Peter re '90 Lexus LS400, 168K, original owner - occasional loss of power. Spoke w'you bit about this year ago. Runs great, like new, excellent engine & transmission response. Intermittent big time lo… read more
lexpert
lexpert
Lexus Master tech
Vocational, Technical or Trade Scho
2,100 satisfied customers
1991 Ls400: replacing..starving..fuel pump relay is clicking
After replacing the starter on my 1991 Ls400 Lexus the engine is now starving for fuel....the fuel pump relay is clicking.… read more
Boxer54
Boxer54
Line Technician
2 years university - did not gradua
1,544 satisfied customers
92 lexus ls400: pass 3k it would jerk..back down..car was clogged
my 92 lexus ls400 was driving perfect when one day at a traffic light it would not want to gain power when i pushed gas to go. RPM did not want to move pass 3k it would jerk when i floored gas too see… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
1,848 satisfied customers
1990 LS400: revs up to 2000-2500 then drops down to 1000..park..warmed
My 1990 LS400 revs up to 2000-2500 then drops down to 1000. It does it while in park. Seems to do it when warmed up. It will continue this up and down thing until I shut it off. I've replaced maf sens… read more
CJ
CJ
Bachelor's Degree
106 satisfied customers
Smooth idle, vibrates at 2000 rpm, smooth again by 2500 rpm
99 LS400 with 145K miles started engine vibration at 2000 rpm in neutral (Park) or drive. Gets smoother but not perfect by 2500 rpm. Idle in neutral has slight vibration but smooths out nicely in gear… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
1,848 satisfied customers
Lexus: RPM..gas pedal..parking lot..the idling also reaches over 3000
Suddenly my Lexus RPM reaches 3000 without stepping on the gas pedal. I have to apply the brake, otherwise the car would run more than 70 miles per hour. Even in the parking lot , once I started the c… read more
lexpert
lexpert
Lexus Master tech
Vocational, Technical or Trade Scho
2,100 satisfied customers
90 LS400: loses power..the gas pedal until I can get the revs..cools
I recently bought a '90 LS400 with 250k miles that runs well most of the time but occasionally loses power when warm, surges at idle, and seemingly won't respond to the gas pedal until I can get the r… read more
lexpert
lexpert
Lexus Master tech
Vocational, Technical or Trade Scho
2,100 satisfied customers
2000 rx300: recently bought..check engine light..it started fine..die
I just recently bought a 2000 rx300 less than two months ago, it has been driving great the only problem the check engine light would came on, today I stopped and got gas went to start the car, and it… read more
ase_master327
ase_master327
Owner & Student
High School or GED
3,214 satisfied customers
I have a 93 lexus ls400 with 175,000 miles on it. My ...
I have a 93 lexus ls400 with 175,000 miles on it. My problems are: (A) I drive the car normal I have no problems, but when I get on the throttle (about half throttle or so) the car starts to sputter, … read more
lexpert
lexpert
Lexus Master tech
Vocational, Technical or Trade Scho
2,100 satisfied customers
shift gears..gears without jerking..converters, still same problem
Engine throttles up ok with no load but not enough power when put in gear to throttle up fast enough to shift gears without jerking. replaced mass air sensor, throttle control sensor, cleaned converte… read more
lexpert
lexpert
Lexus Master tech
Vocational, Technical or Trade Scho
2,100 satisfied customers
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Meet the Experts:

lexpert

lexpert

Lexus Master tech

2,100 satisfied customers

Master Certified with lexus, 8 years experience with Lexus

Skyvisions

Skyvisions

ASE Certified Technician

1,848 satisfied customers

Lexus Expert

Ron Z.

Ron Z.

- Lexus Tech -

454 satisfied customers

18+yrs experience. State Inspector and Lexus Diagnostics

Chris (aka - Moose)

Chris (aka - Moose)

Technician

345 satisfied customers

16 years of experience

AMD

AMD

Master Technician

270 satisfied customers

L1 Advanced Level Diagnostics Specialist

George H.

George H.

ASE Certified Technician

224 satisfied customers

15+ years ASE Master w/L1 Drivability certification

Tim Mohr

Tim Mohr

ASE MASTER

129 satisfied customers

30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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