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All LS400 owners with bad gas mileage READ THIS!

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Old 10-01-08, 08:37 AM   #46
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8942220010
there you go, was posted on first page.. recommended to grab it from the local toyota dealer instead of lexus.. same part number, same sensor.. save some money
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Old 10-01-08, 08:43 AM   #47
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thanks for that pic avalon.. how much ish did you need to unbolt to get to it? not really mechanically inclined..
I went all out and took off the entire intake to the throttle body, spark plug covers, spark plug wire covers. But I was doing that because I also figured to inspect my valve cover and spark plug gaskets, they're leaking bad. Next things on the list to do. Some said you could bypass all of that just by taking off the ignition coil off the front, but I don't see how you can because that's not really in the way other than being attached.

It should take an average person less than 1 hour to complete this. It's worth it though. I'm going to take a picture of my sensor to show you how far gone it was.
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Old 06-26-10, 03:11 PM   #48
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The Coolant tempurature is located on the front left top of the motor. you have to remove the all the plastic pieces from the top front of the motor. The far left is the coolant temp sensor...to the right of that sensor is the one wire temp sensor for the tempurature guage. There is a large sensor around these 2 sensors screwed in an angle from the front of the coolant jacket...this is the thermal time switch.
Based on your description of the location of the thermo time switch, I cannot find it anywhere. Dumb question, Where is the thermo time switch actually located. 94 LS400
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Old 06-26-10, 09:54 PM   #49
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It's right here.
so what did you pull off? all the intake system, you left on the throttle body? And the timing belt covers and thats it?
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Old 06-27-10, 12:23 AM   #50
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For first gen owners, read post 30 in this write-up for a second gen:

http://www.clublexus.com/forums/ls40...ange-pics.html
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Old 06-27-10, 12:25 PM   #51
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Has anyone accomplished this task for 98-00 LS400. If so what is you fuel tank mileage?
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Old 06-30-10, 01:41 PM   #52
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On my 98-00 LS Navi Model I get

18~19mpg on 91 octane.
20~21mpg on 87 octane.

Cheaper gas, more mileage. (I drive everywhere with Cruise Control on)

LOL
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Old 06-30-10, 02:01 PM   #53
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87 octane....
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Old 06-30-10, 02:16 PM   #54
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before anyone turns this into an octane fight please note that we have threads for that already, so dig them up and dont fight in here or dont make a new thread about it
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Old 06-30-10, 06:38 PM   #55
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I got all excited about this thread, until I read that your new "better" MPG is worse than my current highway mileage.
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Old 07-01-10, 08:18 AM   #56
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Certainly this mpg info & improvement is dependent on the vintage of your LS.
A finely tuned UCF-10 model is not going to get the mpg an LS430 is capable of. My 94 LS is certainly under 19 mpg in the city.
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Old 09-10-10, 10:41 AM   #57
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Can you post the current reading of ECT?
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Old 09-10-10, 12:05 PM   #58
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i cant believe i never found this thread when looking for gas mileage issues. glad it popped up here before i bought 2 main o2 sensors. im getting 18-19mpg almost all highway. leaned out the maf and made no difference. im gonna try to change this sensor this weekend and see how it does next week. i drive ~80 miles a day.
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Old 09-13-10, 06:22 AM   #59
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bought the sensor friday and put it in saturday morning. i couldnt beleive how much crap i had to remove to get to it. all the plastic covers over lap each other. anyway, took about 20-30 min from start to finish. once it was in i went for a test drive. well, it instantly seemed to run better. there used to be a slight hesitation sometimes at ~2k rpm, but i havent felt it since changing the sensor. as for gas mileage, idk. im going to fill up 2marrow morning and reset the trip computer so i can get an accurate reading. 90% of my driving is interstate, so im hoping for the 25mpg range. ive been at 18-19.
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Old 09-13-10, 08:48 AM   #60
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williamb82 have you changed all 4 oxygen sensors?
i can't wait to see how much MPG will be getting, since am planning to do this also soon!

For me i drive 85 MPH with cruise all highway i get 19-20 MPG
report back with your MPH/MPG .

User manual says that using 5W-30 engine oil will also increase fuel mileage, any one who noticed this?
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Last edited by qewani1; 09-13-10 at 08:52 AM..
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Old 09-13-10, 08:48 AM
 
 
 
 
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91, bad, box, coolant, ecu, forum, fuse, gas, lexus, ls400, mileage, oxegen, sensor, seville, temp, thermometer

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