LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Mpg

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Old 12-15-11, 01:36 PM
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McPierson
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i believe there is a different sensor that the PCM uses. This is the sensor to change. The gage uses it's own sensor.

There are some writeups so do a search.
Old 12-17-11, 12:08 AM
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you mean i need to change the ETC sensor? would a malfunction ETC sensor cause the car's rpm to fluctuate differently accordingly to the weather? what i mean is for example, during the day when its sunny, my car's rpm would be at 400 at red lights while in drive, but at night when its dark and a little colder, my rpm would stay at 600 at red lights in drive instead of 400.
Old 12-19-11, 04:56 AM
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Originally Posted by FireEMT978
Is this just recently? May want to check the O2 sensors.
I bought the car 1month ago from copart.com so i don't have a clear history
Old 12-19-11, 04:58 AM
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Originally Posted by Zs05039558
I bought the car 1month ago from copart.com so i don't have a clear history
Though it should be new coz she only did 70.000 miles
Old 12-19-11, 04:59 AM
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Originally Posted by FireEMT978
Is this just recently? May want to check the O2 sensors.
Will do
Thx
Old 12-19-11, 05:02 AM
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Originally Posted by McPierson
May want to check for vacumme leaks. I had one that actually helped my MPG, but you never know. Check that you don't have a sticky brake.

Was that a hand calculation or the computers number?
I calculated by hand with the car odo.
Good point for the vacuum coz the breaks feel little funny
Thx
Old 12-19-11, 05:03 AM
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Originally Posted by xtremex626
heard changing out the fuel filters help as well. problem is we have two. one in the fuel line and one in the gas tank area.
Thx extreme
Old 12-19-11, 05:06 AM
  #23  
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Originally Posted by PureDrifter
guys stay on topic in terms of what the OP could do to better his mileage, we already have a couple dedicated gas mileage threads .

OP-how do you drive? if you are driving at high rate of speed in hot weather with the AC on, consistently, then that's the mileage you're going to get.

I don't drive with much thrust and big acceleration and i use the cruise whenever possible
Old 12-19-11, 05:12 AM
  #24  
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Originally Posted by timmy0tool
is the OP even a person, that sn looks awfully vague and computer generated. from the united arab emerates?! but heck i could be wrong.

to answer the ? i get a mixture of 20-22mpg mostly highway on the weekends only. i drive 5 miles to work weekdays on a bone stock car. my rpm hardly ever goes past 2k rpms and the ECT is on NORM. i would check your driving habits.


Yes i am a person

Z is for zaid
S is for my family name
And the digits are my cell no.
The sn was suggested by the computer
I am a human that lives in uae
I got the car online and i found your site like so
Old 12-19-11, 05:23 AM
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Originally Posted by whit3b0y
is the parking brake released?
Yup.
This was the first question by my mechanic
Old 12-19-11, 05:27 AM
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Originally Posted by Chilkoot
Its 12 years old, could be that the engine temp sensor is starting to go, making your car run rich as it always thinks the engine is cold.

Do you get white vapor from the tailpipes? Fuel smell?
The temp gage rises within seconds from starting
I persume this means the sensor is doing fine and the tailpipes are crystal clear
Old 12-19-11, 05:58 AM
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Originally Posted by McPierson
i believe there is a different sensor that the PCM uses. This is the sensor to change. The gage uses it's own sensor.

There are some writeups so do a search.
Forgive my ignorance but what pcm stands for?
Old 12-19-11, 06:21 AM
  #28  
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I'm not sure that's the vocabulary that Lexus uses, but GM uses powertrain control module (PCM).
Old 12-19-11, 03:07 PM
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It could be a vacuum leak in the intake ducting so that air is bypassing the MAF. The O2 sensors detect a lean condition and start dumping fuel.
Old 12-19-11, 03:31 PM
  #30  
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Originally Posted by McPierson
I'm not sure that's the vocabulary that Lexus uses, but GM uses powertrain control module (PCM).
lextoy uses ECU/ECM generally.
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