Alexi

2- all 4 ls400 OEM oxygen sensor has 4 wire, 2 for oxygen sensor, 2 for heater, if you find your sub with only 2 wires, i assume that they have been replaced with non OEM, so no reading is obvious

1- there is a way to test the oxygen sensor "in action", but i cant find the manual for you now, sorry

Thanks for your reply but yeah, the sub(rear) O2 sensors do have 2 wires only!

Look here.....

http://www.lexls.com/tutorials/EFI/suboxygensensor.html

Al.

Thanks for all your helpful input guys! Very helpful

Al.

Hi all. I decided to finally tackle my O2 sensor issue and have a couple of questions.

1) I tested the heater resistance of the main sensors (front) with a ohmmeter and the resistance was about 1.3 ohms on both sensors. Is that normal? The car had cooled down for about 2 hours so i'm not sure what the temp was. But is that reading ok?

2) I tested the resistance on the sub sensors(rear) and got no reading on both! Does that mean they're pooped or am i testing them wrong? There was only 2 wires on the sub sensors so i dont think i could've gone wrong??

Any help would be appreciated!

Thanks.

Al.

just took my headlight out of the car's bracket to see if there was enough room. for my observation there is just enough, actually if looks like a perfect fit. the lense may touch the headlight glass but that is what gives the best output. also i may even be able to keep the retaining ring and the OEM look! definately gotta file the opening a little larger and may need custom mounting brackets :cries: . the 1st gen doesn't have a seperate reflector bowl it's all the housing, so i may have to drill holes in it to mount the projector? but there's also some breather valves on the sides of the housing. i assume this is to let exessive water escape but i think that may hurt my HID's?

just wanted to let everyone know that the job will continue, rain, sleet, snow, hail!

P.S. will get camera next week!

Any updates bro?? Very intrested!

Think it's the same...

http://www.lexls.com/tutorials/lighting/upperstoplight.html

One more thing, as i was scanning after EGR job. I noticed the "od/off" light blinking.(traction off was not blinking this time btw). anyway,it was blinking in a pattern,so i thought i'd count that too. It blinked 6 times,paused for 1 sec. then 8 times. paused for 3 secs. and then over again(6 then 8). Which means ''68'' ?? anyone know whats up with that??? Again this is not the cel i'm reffering to . it's the ''od off''.

Thnx in advance..

Al.

**UPDATE**

I thought i'd tackle my EGR(code 71) problem today, and here's what i came up with.....

I started with the VSV.... Removed the VSV, tested it , it was ok. Then i tested the EGR vacuum modulator,it was ok.

And last i removed the EGR valve..........Sure enough there was my EGR problem! OMG was it ever clogged up with gunk and carbon!!!!!! I mean one of the ports(the top one if i recall) was COMPLETLY clogged up with gunk!! So i bought a can of throttle body cleaner and started cleaning it. then i noticed there is a plate (which the egr valve attaches to) that attaches to the intake manifold. the top port on the manifold was also completly clogged with gunk. it was only 2 nuts and two screws to the plate off , so i took it off , cleaned the back side of the plate(was also full of crap!) .Also attached to this plate is the EGR temp sensor if im not mistaken. I also cleaned all the crap off of that. Put everything back together and that was it! No more code 71!!!! i had the battery dissconnected the whole time i was working on it BTW.

The results... SMOOOTH shifts! No more code 71, SMOOOTH idle, and i'll bet way better fuel mileage. Unfortunatly the 0-60 is still the same(10 secs) But top end has improved dramaticlly!!! :D

Here are the procedures..........

http://us.lexusownersclub.com/forums/index...ost&id=4314

http://us.lexusownersclub.com/forums/index...ost&id=4177

"j.barleycorn" had these files posted in some previous threads. thanks .

i was also going to take off the throttle body and clean it, but i looked inside and it looked as if was cleaned recently. Even the back side of the back plate was clean! So that, i dont have to worry about . I still have to tackle the TPS problem. You guys think that has anything to do with my slow 0-60 ??

Well, time and tinkering around further more will only tell. Untill then i'll keep this thread updated . Just glad i'm through with the EGR prob. It was very easy to do BTW. I would recommend that everyone check there EGR valve. It is VERY easy to do and takes 5 mins to take off.

If there is a modurator following this thread please keep this thread on the first page for easy viewing for the members.

Thnx in advance....

Al.

QUOTE(thieaux)

Craig try to unplug the water temp sensor and runing the car , tell us what it did. (Its located right next to the thermostat housing it has 2 cables comig out of it. If you stand in front of the car it would be to the left of the thermostat housing just beneath the ignnition coil , right next to it thers the gauge temp sensor tha has only one cabel comig olut of it.

____________________________________

hi. i'm curious . how is that going to improve acceleration?? or did u mean something else?? reason i ask is cause i have a poor acceleration like craig.actually identical!

Al.

PS. Any updates Craig?? i'm all ears too!!!

gl

Keep us updated bro and good luck.....

Al.

Maybe the erg code was never cleared. Clear it by removing the neg battery terminal clamp for a couple of minutes. There is a fuse you can remove so you don't have to reset everything. But I am not sure which one it is. Be sure to disable or know the activation code for you stereo before disconneting the battery.

Code 41 is for the tps itself or the wireing harness, But as most codes go, the final prob. may be the ECM. Look at www.lexls.com for advice on adjusting the tps. You can buy a new tps from park place lexus in plano, texas for $75.00. www.newlexusparts.com

The codes narrow you to the system failure. The a service manual will lead you through the sequence of testing, Mainly ohm and voltage testing of each sensor or part.

Look at www.bgprod.com for info on having your erg system cleaned.

thnx for your reply.... i have dissconnected my negative a couple of times ,and both times for over two hours. i know there is a problem for a fact since my 0-60 mph is vey slow. last time it was about 11.33 secs. i also noticed when crusing at about 37 mph or 60 kph. Rpm's at about 1100 . i'll floor the pedal and the rpms will jump real high ,while the speed is not improving , untill the tranny shifts and then starts to improve.im also getting poor gas milage. so yeah. im pretty sure i have a problem within the egr system or the tps system.

I'll keep y'all updated as im really anxious to find and fix this problem, but in the mean time , ANY input would be appreciated.

Al.

Bump......

WOW!! Very good find buddy.

hello all! after having the ''CEL + Traction Off ''in my face for about 2 weeks now i finally got fed up and did the ghetto scan(jumping with paper clip), and i came up with two error codes..... (i also noticed while i was counting how many times the cel blinked, that the ''traction off'' light was constantly blinking??)

Can you point me ot the instructions on doing this?

TIA

Here ya go.....

Very easy to do btw

http://www.troublecodes.net/Lexus/

Al.

hello all! after having the ''CEL + Traction Off ''in my face for about 2 weeks now i finally got fed up and did the ghetto scan(jumping with paper clip), and i came up with two error codes..... (i also noticed while i was counting how many times the cel blinked, that the ''traction off'' light was constantly blinking??)

1) 71 (egr system malfonction).

2) 41 (tp sensor signal).

Now believe me i've been doing tons and tons of searches and reading ,but just need to know if i need to get it further diagnosed to pin point the problem within let's say for example: the egr system, or is it as simple as just replacing the EGR modulator?

I haven't been able to find a thread that explains exactly what these codes mean . ofcoarse i know the codes represent egr and tps , but thats it. any input would be highly appreciated..

Also i've been closely followin CanadaCraig's thread called(please do me a favor) and i thoght i'd try to see how long it would take my LS400 to reach 60mph , and it took 10 secs. i have noticed it is a bit slow(launch) and i cant spin the wheels from a stand still???? could that be assosiated with my egr or tps???

again. any input or thoughts would be really appreciated....

Al.

PS. it's a 1991 LS400 270XXX kms regularly maintaned by dealer,very clean engine/tranny, intake (k&N) just cleaned and oiled, records show lots of work was done to it. and BTW, the egr pipe was replaced 5 months ago....

Try this thread http://us.lexusownersclub.com/forums/index...365&hl=fans

Driving too fast?

Btw the stuff we put in was called duracool. what are your thoughts on this stuff?

Those fans don't come on unless the temp is really high, Like in the Sahara. As for the cooling in the cabin did you put freon in with gauges?

Hi. i'm going to actually get the pressure tested. a guy at auto value did it for me ... im betting its over filled therefore causing this????

Al.

btw. were would the relays for the fans be???

Hello everyone. I noticed there are two small electric fans on the radiator. can someone tell me exactly what those are for? i have noticed they never turn on??? reason im asking really is because i just got my A/C filled with a can of freon, and it's not that cold. just cool. i checked for trouble codes on the climate control , nothing. compressor is working and i dont have leaks. now a buddy of mine said his bmw is doing the same thing and its because his A/C fans are not working. Is this true??

Any input would be appreciated....\

Al.

It's a 91 ls400 btw