Project Lexus LS 400 Episode 33 - Solving high fuel consumption and stuttering acceleration
ฝัง
- เผยแพร่เมื่อ 22 ก.ค. 2024
- Yay, a new episode of Project LS 400! I have been working on my 1994 Lexus LS 400 off camera, and in this episode I'll get you up to speed and I dive into a longer-existing problem: the stuttering under acceleration. And this time: I fix things.
If you want to buy me a coffee, please use this link: buymeacoffee.com/arnoldsrepairs
0:00 Intro
1:09 Recap
3:11 This Episodes project
5:40 Removing the ECU
10:30 Test drive
11:33 Test results
12:54 Internet research and explanation of the problem
16:49 New sensor has arrived
17:30 New sensor is in
18:13 The test results (are amazing!)
Intro music: Kathmandu by Dave Whitcroft
Other music: Ratatouille's Kitchen by Carmen María and Edu Espinal - ยานยนต์และพาหนะ
![THE TOYS x NONT TANONT - ดอกไม้ที่รอฝน (spring) [Official MV]](http://i.ytimg.com/vi/pPa1d5cC8M4/mqdefault.jpg)
We all thank your friend for loaning you their LS-400 ECU so that you could troubleshoot with it: Bravo great friend !!!
Yes, I'm really greatful for that. But I'm also super grateful for your support Joe, that keeps me motivated!
Great to see some real ‘old school’ troubleshooting using the manuals and guides. Great work Arnold, a few more problems ironed out 👏👏👏
Thanks Mike, this was quite the challenge! And thanks for the coffee!
@@Carnold_YT well deserved, and no problem 😁👌
By the way I replaced the same sensor you replaced in the video, nothing happened with my car about high fuel consumption. Even Mine was completely broken, but there's no hesitation , but I changed it any way with the thermostat when I did the cooling system flush.
Wow! @9:08 I was very very surprised about how easy it is to access the ECU on a 1st gen LS-400 !!!
2nd gen LS-400's are located behind a new (larger) "glove/map/manual" box and rotated 90 degrees to vertical behind the Nakamichi CD changer which takes the place of where the 1st gen "glove box" is located.
Thanks for making another very informative LS-400 video that will be helpful to everyone now and in the future.
P.S. I hope that in the future an AI is trained on your LS-400 wisdom videos, and not on others out there...
Thanks so much for your comment Joe! Much appreciated!
Great video, congrats with the progress in troubleshooting!
Thanks for all the help and videos.
Thanks for watching!
#1 If there's an air leakage in air hoses between air filter body and throttle gate , this will cause high fuel consumption, you should make air leakage test .
#2 if the upstream oxygen sensors are weak or not functioning well or very old or broke, that's will cause high fuel consumption.
#3 very dirty mass airflow sensor, will cause high fuel consumption and hesitation .
#4 old weak spark plugs will cause high fuel consumption and hesitation.
#5 very old dirty fuel filter will cause hesitation.
#6 bad coils can cause hesitation , in your car , you have two coils connected to 2 electric distributions , one in each bank then connected to spark plugs cable s , this distributions sould not be Worn out from inside.
My advice start with upstream oxygen sensors, you will feel big difference.....
Disconnect the battery before replace them.
Waiting for your update.
During this project I have replaced all the parts that you mentioned. Apart from the Oxygen sensors, but I've measured them and the check out just fine. I will further investigate the wiring loom and vacuum lines, someone has tampered with that in the past. Thanks for your comment!
@@Carnold_YT if you replaced all above , then sometimes weak torque convertor make same hesitation issue .
I keep my fingers crossed that won't be the case. I have some other leads tgat I first want to investigate.
@@Carnold_YT it's easy to know, just watch the RPM especially in the highway , if you need to press the accelerator more and more to keep the vehicle in same speed, that's mean bad tourqe convertor or weak transmission , and high RPM mean high gas consumption. It's like the engine gives all its power to push the vehicle forward .
Arnold, ik stuit net op je video's over jouw LS400. Ik heb zelf ook een UCF10 (origineel NL zelfs) en jouw video's geven zo ontzettend veel goede tips! De mijne stottert momenteel ook soms, dus ik ga dit meteen proberen. Bedankt en groetjes!
Leuk om the horen! En een origineel Nederlandse UCF10 zie je nog maar weinig, wees er zuinig op!
Thanks!
You are welcome!
@Carnold_YT When I go to part store or order online, what is the EXACT name for temp sensor for ECU? I'm getting confused on the what I see at local part store. 😀
The OEM number is: 89422-35010 I hope this helps!
Hi there, replaced the sensor, no change, but discovered the wires on spark plugs were original, mechanic recommended a good tune up, maybe that will resolve the poor acceleration and fuel consumption! Thank you so much and I will keep you posted. 😊
@@cathefreeman8853 Oh, fresh spark plugs and leads are always a good idea. I will look into my fuel pressure regulator too, I think my remaining issues are a result of a low fuel pressure. Let me know what results you got from changing the plugs and wires!
How was the fan operation with the old temperature sensor? On my 1999 Corolla, the dash temp gauge sensor has started to show a bit colder than is normal sometimes since last year (after an oem thermostat replacement also, that didn't fix it), but I think the ECU sensor is fine because the fan still runs in stop and go traffic. Another good reason to follow fuel economy. I have my car registered on Spritmonitor for this reason! Very enjoyable videos, the Mash engine rebuild one got me hooked :) Cheers from Leiden
A low coolant temperature reading can also be caused by a sticking thermostat - this is quite common with older Toyota engines. Did you check that already? In my case, the fan operation was normal - the fan uses a different, seperate temperature sensor (it's a Lexus after all, why use two sensors if you can have three?)
@@Carnold_YT Oh ok I thought it would be the same 2-sensor system like my Corolla. Yep I changed the thermostat with a new OEM one and it didn't change anything. Mostly it shows correct besides having it drop a bit (at 8:30 instead of 9).
Next time I do a cooling flush I'll order new ones. 50 euro a piece from Louwman if I remember right, not bad for peace of mind :)