1UZ Engine Shutting off when temperature rises to half
09-18-13, 01:17 PM
#31
Driver School Candidate
MattLS400,
The caps are less than $10 (that includes shipping).
Compared to everything else you've done - this is chump change.
Regarless of whether it fixes your issue - I'm a believer in Yamae and Cowboy - your car will need the caps changed.
Good Luck - and let us know...
The caps are less than $10 (that includes shipping).
Compared to everything else you've done - this is chump change.
Regarless of whether it fixes your issue - I'm a believer in Yamae and Cowboy - your car will need the caps changed.
Good Luck - and let us know...
09-18-13, 01:23 PM
#32
Lexus Champion
it's funny how many skeptics we had at first, and how many people are thanking us now! - I guess folks have a hard time believing something that isn't taught in mechanic's school! 
09-29-13, 09:25 PM
#33
Moderator
This is about a TV. The ECU is slightly difficult but it is strange to me that boys can't do that.
I worry about the shorter life of many consumer products made at East Asian countries.
Especially electrolytic capacitors have shorter life compared with Japanese ones. Electrolytic capacitors are widely used even in a coffee maker to control the temperature precisely these days. Of course a TV has many of them. LED lights use them too. LEDs last much longer than electrolytic capacitors and I am currently busy asked by my friends to fix the power circuits of LED lights made in China.You'd better practice to change those capacitors using an ECU for a LS400.
10-01-13, 05:10 AM
#34
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My problem is ny temp on the computer is reading -7degrees I changed out the computer I also changed out the temp sensors and still i am consuming a lot of gass still because my temp is not reading correct what do you think
10-01-13, 05:22 AM
#35
Lexus Champion
you changed the 2-wire engine coolant temperature sensor under the hood near the passenger side coil and you used the real Toyota part from the dealership like you should?
what year is the car? - how much did you pay for the part and where did you buy it?
what year is the car? - how much did you pay for the part and where did you buy it?
10-01-13, 07:43 PM
#36
Pole Position
Thread Starter
Just an Update, with reference to advice from this thread;
https://www.clublexus.com/forums/ls4...problem-2.html
https://www.clublexus.com/forums/ls4...problem-2.html
After running my 1996 LS400 for approximately 15 minutes afternoon, which ran like a beast might I add...But was enough time to let the temperature reach the half-mark level, and then its back to my common nightmare these days....Rough Idle, followed by a shutting off of my 1UZ...
(See Post #1 of my thread https://www.clublexus.com/forums/ls4...s-to-half.html )
As advised ( and thankfully I am as a matter of fact, by Yamae and LSCowboy )
I have replaced the Fuel Pump Relay with a "direct" or "jumper wire" as indicated in the picture to the further below. However, to my dismay the situation is not improved and the rough idling still persists. Meaning the Jumper wire did not solve the problem. Therefore I guess my Fuel Pump ( which I replaced with a genuine new Toyota Fuel pump last week) and my Fuel Pump Resistor are in good working condition ??
(See Post #1 of my thread https://www.clublexus.com/forums/ls4...s-to-half.html )
As advised ( and thankfully I am as a matter of fact, by Yamae and LSCowboy )
I have replaced the Fuel Pump Relay with a "direct" or "jumper wire" as indicated in the picture to the further below. However, to my dismay the situation is not improved and the rough idling still persists. Meaning the Jumper wire did not solve the problem. Therefore I guess my Fuel Pump ( which I replaced with a genuine new Toyota Fuel pump last week) and my Fuel Pump Resistor are in good working condition ??
10-01-13, 07:53 PM
#37
Pole Position
Thread Starter
A girl is changing capacitors of a Samsung TV at below.
http://www.youtube.com/watch?v=8l0AUj8QUkg
This is about a TV. The ECU is slightly difficult but it is strange to me that boys can't do that.
I worry about the shorter life of many consumer products made at East Asian countries. Especially electrolytic capacitors have shorter life compared with Japanese ones. Electrolytic capacitors are widely used even in a coffee maker to control the temperature precisely these days. Of course a TV has many of them. LED lights use them too. LEDs last much longer than electrolytic capacitors and I am currently busy asked by my friends to fix the power circuits of LED lights made in China.
You'd better practice to change those capacitors using an ECU for a LS400.
http://www.youtube.com/watch?v=8l0AUj8QUkg
This is about a TV. The ECU is slightly difficult but it is strange to me that boys can't do that.
I worry about the shorter life of many consumer products made at East Asian countries.
Especially electrolytic capacitors have shorter life compared with Japanese ones. Electrolytic capacitors are widely used even in a coffee maker to control the temperature precisely these days. Of course a TV has many of them. LED lights use them too. LEDs last much longer than electrolytic capacitors and I am currently busy asked by my friends to fix the power circuits of LED lights made in China.You'd better practice to change those capacitors using an ECU for a LS400.
After having come to the conclusion that my car is a 1996 JDM Celsior, would it mean that I would require a different set of Capacitors from what LSCowboy specified in his thread ;
https://www.clublexus.com/forums/ls4...capacitor.html
as
1995-97 LS400 requiring 6 caps as follows:
Qty. 2 of 10uF - 50v
Qty. 1 of 47uF - 63v
Qty. 2 of 100uF - 10v
Qty. 1 of 220uF - 16v
10-01-13, 08:32 PM
#38
Driver School Candidate
Join Date: Oct 2008
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Hi,
I think you will benefit from following the advice given by both LScowboyLS, Yamae, and several others who have advised changing out the caps. They have listed the year/models and the capacitors that should be ordered and replaced. If you have any doubts, look up the thread on ECU and you will realize that your engine issues are very likely linked directly to the failed/failing caps.
I have just changed 9 caps in my ECU and resolved odd behaviors with CEL intermittent and random bursts of low power output - all based on trusting the information from these very generous folks. Granted, the task of swapping out the caps is not for the fainthearted, but it should be done, and done correctly with the right caps and equipment.
Good Luck!
I think you will benefit from following the advice given by both LScowboyLS, Yamae, and several others who have advised changing out the caps. They have listed the year/models and the capacitors that should be ordered and replaced. If you have any doubts, look up the thread on ECU and you will realize that your engine issues are very likely linked directly to the failed/failing caps.
I have just changed 9 caps in my ECU and resolved odd behaviors with CEL intermittent and random bursts of low power output - all based on trusting the information from these very generous folks. Granted, the task of swapping out the caps is not for the fainthearted, but it should be done, and done correctly with the right caps and equipment.
Good Luck!
10-04-13, 08:56 AM
#39
Pole Position
Thread Starter
I have contacted my electrician (who was highly recommended by my local dealership) to inquire whether or not any work was done on the ECU. He then told me all capacitors were changed, as well as a full inspection was conducted on the entire board...with the same voltage and microfarad caps, however, I highly doubt that the recommended LOW ESR type capacitors by LScowboy were used....
I guess the only way to find out is to take pictures and upload !
I am currently looking for the Idle Air Control Valve (IACV) for this 1UZ-FE or even a part number would be helpful ...thanks
I guess the only way to find out is to take pictures and upload !
I am currently looking for the Idle Air Control Valve (IACV) for this 1UZ-FE or even a part number would be helpful ...thanks
10-04-13, 12:10 PM
#40
Pole Position
I have contacted my electrician (who was highly recommended by my local dealership) to inquire whether or not any work was done on the ECU. He then told me all capacitors were changed, as well as a full inspection was conducted on the entire board...with the same voltage and microfarad caps, however, I highly doubt that the recommended LOW ESR type capacitors by LScowboy were used....
I guess the only way to find out is to take pictures and upload !
I am currently looking for the Idle Air Control Valve (IACV) for this 1UZ-FE or even a part number would be helpful ...thanks
I guess the only way to find out is to take pictures and upload !
I am currently looking for the Idle Air Control Valve (IACV) for this 1UZ-FE or even a part number would be helpful ...thanks
I don't think you'd want to pay dealer price for a new one but you can clean and rebuild yours. (if it's bad)
10-10-13, 08:13 PM
#42
Pole Position
Thread Starter
http://www.ls400.ru/lexus-89-2000/il...f/iacv/ovi.pdf
My IACV on my 1996 Celsior is working. Nevertheless, I removed it in its entirety and serviced it. It was very dirty.
However, this is not the solution to my problem. The rough idling once the engine is warm still persists.
10-10-13, 08:27 PM
#43
Pole Position
Thread Starter
From the following picture, using an OBD 1 Toyota Codes Scanner;
Codes 21 and 28 are coming up.
I believe these are 21- MAIN OXYGEN SENSOR
and 28 RIGHT OXYGEN SENSOR
Please provide me with a part number or an e-bay link to source these 2 sensors new please.
Codes 21 and 28 are coming up.
I believe these are 21- MAIN OXYGEN SENSOR
and 28 RIGHT OXYGEN SENSOR
Please provide me with a part number or an e-bay link to source these 2 sensors new please.
10-11-13, 01:06 AM
#44
Lexus Champion
21 = Main oxygen sensor signal (on left bank)
28 = Main oxygen sensor signal (on right bank)
● these are both of your MAIN O2 sensors (i.e. the ones between catalytic converter and engine, also known as pre-cat)
● make sure your mechanic changes the correct pair - don't worry about the ones after the catalytic converter (known as post-cat or tattletale O2 sensors) unless you live in an area with emission standards.
● the Denso part number for both of them is 234-4169 - so you will need to order quantity two of these - best deal is at amazon
● normally I would advise more testing to make certain these have gone bad, but on a nearly 20 year old car, it's time to replace this most important of all sensors, this is the main sensor that affects how the car runs!
O2 sensors have it rough, they get hit with hot dirty exhaust their whole life and still are expected to report critical information! - I have included a photo of this exact Denso 234-4169 sensor.
Last edited by LScowboyLS; 10-11-13 at 01:13 AM.
10-11-13, 05:51 AM
#45
Pole Position
Thread Starter
the codes are:
21 = Main oxygen sensor signal (on left bank)
28 = Main oxygen sensor signal (on right bank)
● these are both of your MAIN O2 sensors (i.e. the ones between catalytic converter and engine, also known as pre-cat)
● make sure your mechanic changes the correct pair - don't worry about the ones after the catalytic converter (known as post-cat or tattletale O2 sensors) unless you live in an area with emission standards.
● the Denso part number for both of them is 234-4169 - so you will need to order quantity two of these - best deal is at amazon
● normally I would advise more testing to make certain these have gone bad, but on a nearly 20 year old car, it's time to replace this most important of all sensors, this is the main sensor that affects how the car runs!
O2 sensors have it rough, they get hit with hot dirty exhaust their whole life and still are expected to report critical information! - I have included a photo of this exact Denso 234-4169 sensor.
21 = Main oxygen sensor signal (on left bank)
28 = Main oxygen sensor signal (on right bank)
● these are both of your MAIN O2 sensors (i.e. the ones between catalytic converter and engine, also known as pre-cat)
● make sure your mechanic changes the correct pair - don't worry about the ones after the catalytic converter (known as post-cat or tattletale O2 sensors) unless you live in an area with emission standards.
● the Denso part number for both of them is 234-4169 - so you will need to order quantity two of these - best deal is at amazon
● normally I would advise more testing to make certain these have gone bad, but on a nearly 20 year old car, it's time to replace this most important of all sensors, this is the main sensor that affects how the car runs!
O2 sensors have it rough, they get hit with hot dirty exhaust their whole life and still are expected to report critical information! - I have included a photo of this exact Denso 234-4169 sensor.
Thanks Cowboy!
Query: According to your Amazon link, it doesnt fit a 1996 LS400
Also, seeing that I need Main O2 Sensor ( Left Bank) and Right O2 Sensor (Right Bank)
would it make a difference if I state that my car is RHD ? or would these said pre-cat sensors be the same on both RHD and LHD
