Raddison

Just buzzed through the thread, and from what i've read, it seems a lot of people with the 1LS aren't getting much out of this.

When I head up to the shop in a few hours, I'm gonna get going on this, on my 90 that averages <300 miles a tank (~250 when its <75% highway driving!!!), from all the rave reviews, I'm pretty excited!

williamb82

my last tank was 15.6mpg. though i did start the car and let it idles for 10-15min to warm up and melt the ice on the windows etc.. cause its been in the low 20's the last week in the mornings. man this milage thing sucks.

shawnlexus

is the toyota part number the same for 95 and newer ls? i would guess so since they are running 1uz?

sam12345

iTrader: (1)

With your type of driving you should be getting between 25 to 28 MPG thats what I get

PureDrifter

iTrader: (10)

no. they arent.

many110

I was getting "p0141" obd code and when I looked up the code, it stated that with this code you could expect poor gas mileage. After changing the one bad o2 sensor, I do noticed an increase in gas mileage. I would recommend that you have the back o2 sensors tested to make sure that they are running up to par if not, then it may best to change then as well. I went with DENSO 02 sensor Direct fit Manufacturer Number: 234-4603 (for 95 ls400).

williamb82

as soon as i can afford to replace the 2 rear sensors i will. right now i need rear carrier arm bushings. need to get those first.

yotoy82

Changed my sensor today, the coolant sensor. It was corroded and broken in half and rusted and everything, seems smoother, will see how the mileage changes now

Scaritto

I'm about ready to invest in changing these sensors out...

1 fill up ago, I averaged 13.9 MPG with 50 miles of highway (at 70 MPH)
EDIT...went 130-some miles on half a tank

And today I filled up averaging 17.8 MPG with 200 miles of highway (again at 70 MPH)
EDIT... went 346 miles on full tank

I never noticed my gas mileage being this bad. I drive extremely conservative throughout town to save gas. I'm one of those people who accelerate so slow they tick you off.

I'm thinking that maybe the winter blend of gasoline may be to affect? Does that sound like a logical guess or no?

LS400BOY

would that location be for a 92 ls400 to????

benjanet

Scaritto - don't accelerate so slow. You should try to get up to your cruising speed without wasting time. Your stoichiometric fuel control is much better at steady state throttle angles and constant engine speed. I've driven around with an oscilloscope attached to both O2 sensors and watched this work. You will get into overdrive and get your torque converter locking sooner.

Scaritto

Thanks for the advice benjanet. I will start accelerating normal now. Can you just please explain this a little bit more to me? I'm not doubting you the least bit it's just strange to hear

EDIT-just went down to 11 MPG all city haha

whiteivory

iTrader: (4)

Can someone confirm there are three ECT sensors?
I have all three symptoms of faulty ECT sensors.

- Car running rich
- Car rough on startup
- Temperature gauge not functional on the cluster.

deanshark

He's saying there are 3 "coolant" sensors, 2 on the engine and 1 on the radiator, not 3 ECTs. (Engine Coolant Temp) It can't hurt to change your ECT, especially if your car is running rough. Running rich can also be your o2 sensors.

whiteivory

iTrader: (4)

cool.
so where are they?

and are they the same parts?