LEXUS LS400 STUCK IN LIMP MODE

[@prodriley]

Okay so my LS400 currently has an issue with cold starts. Takes about 10-15 cranks when cold. Yesterday I swapped out my current ECU (has 3-4 busted capacitors and has damage on the board) for a 2nd ECU I have (only has 1 busted capacator), and she fired up in 1 crank while cold!! Fixed my issue! But, is now stuck in limp mode 🤣 I’ve bought a totally pristine ECU that’s never had damage with the new super capacitors made by LScowboy for a hefty price, but I’ll have a life time warranty and all the capacitors will get replaced with the new super capacitors and the ECU should last another 20 years. Goodluck man.

[@LetsDriftMedia]

Nice man yea ive heard all kinds of weird problems caused by these leaking capacitors.

[@alfredosauceee]

Sucks to hear, yet glad you found the suspected culprit! Hopefully you get it running soon!

[@raymondlopez3987]

Yoo my LS is doin the same exact thing and took it to my mech and he couldn’t find the prob for two weeks he told me get a maf sensor, tp sensor, and still nothin so finally he its the ecu so i brought it home and pulled the ecu after i seen this vid dam near all capacitors are leakin so I ordered sum capacitors and now just waitin for them in the mail 🤞🤞 this works Also great vid, love ur content 🔥

[@LetsDriftMedia]

Nice man. These ecu when they go bad can really throw you in a loop chasing your tail. Hope it works out. Make sure you clean the board with some rubbing alcohol and q tips before putting the new ones in

[@G35host]

Having issue on my g35/350z with the HR MOTOR recently swapped the motor and now it won’t rev past 4k runs flawless but limits at 4k could it be my computer my transmission is also laggin when downshift but upping gears shifts way too quick and hard…once I stop and turn the car off and on its smooth fine but won’t rev over 4k here and there it might rev to 5k

[@bruhlioso2932]

I have a 1990 ls400 and it jumps rpms at 3k rpm only was thinking maf sensory or spark plugs but been hearing alot about ecu's was wondering since mine is 1990 if I can just get one from the junkyard and throw it in

[@carmine-capalot2251]

did you ever fix it?

[@israelgutierrez301]

My ls400 will go into reverse but when put into drive it won’t move any recommendation

[@zef27]

Brooooo....i am watching your channel about 4 years! I live in Athens and im a Toyota eletrician..... never fix a Lexus with this problem!!!! (because we dont have V8) hahaha

[@LetsDriftMedia]

Wow thanks man!

[@robertgardner4508]

Bypass the fuel pump ECU, and replace the capacitors on the Engine ECU is one of the very first maintenance things I did to my 93 LS400. I only now have a CEL for the MAF sensor. Will order a used OEM one off ebay and hope it's good and I will be good to go. Aside from fixing my other obvious LS problems lol.

[@jvst20051]

My 1994 supra is starting to do this today its revs up and down and sounds like it wants to turn of an plus there smoke coming from tailpipe the thing is I replaced the capacitors March of 2021 could they go bad that quick I got nichicon

[@AbdulMannan-c9f]

I have lexus ls400 1999 model my car has problems with breathing air so can you suggest me how I fixed tanx

[@LetsDriftMedia]

Breathing air?

[@iamdamnalex]

Damn, I am back to this video- bro, I am back to the same spot - you still active ? Looking to connect with you- got new capacitors- slow acceleration

[@VoltageDropDiagnostics]

I seen that you plan on just replacing the capacitors. You might need to end up fixing those traces as well. You can clean the board with isopropyl alcohol to get a better view of those traces. And hopefully theyre not too damaged. If the traces are damaged, you can jump them but it just takes a little more practice, patience and tooling. I have a video fixing a similar failure on a Tacoma.

[@LetsDriftMedia]

Thanks man, I read a pretty detailed forum on doing this repair hoping for the best, kind of sucks because the traces that have the burn marks are very tight so hope I will be able to clean them enough. I will check out your video

[@negativeindustrial]

@@LetsDriftMedia Did this ever fix yours? Yours is a UCF10? Mine is a UCF20 and I’m told these ECUs had been redesigned along with the gauge cluster issues but I can’t confirm. I can confirm that my gauge cluster is fully original and 100% functional. Any help would be appreciated. My 1JZ Twin-Turbo SC300 is having similar issues and my MR2T’s brand new ACT clutch just locked up, as well. So my whole fleet is down and I need to get to work.

[@LetsDriftMedia]

@@negativeindustrial yes I did an update video a few videos after this one was posted, I resoldered the leaking capacitors in the ECU and everything’s been good since

[@negativeindustrial]

@@LetsDriftMedia You replaced them or resoldered them? Thank you for the reply!

[@LetsDriftMedia]

@@negativeindustrial my bad. I replaced the leaking capacitors. Resoldered NEW capacitors into the ecu. I left the link in the other video to a good forum page with good detail and part info you’ll need.

[@billdaniels7815]

Well did it fix the problem

[@LetsDriftMedia]

yes

[@BasketballAve]

I’m having hell of a time trying to figure out my UCF10 it runs rich and shitty like a misfire but no codes ... you accelerate then let go of the gas...the idle dies ... already launched a parts cannon. Lol did the plugs rotors and caps ... did replace Ecu and MAF. Oxygen sensors pre cat are like a year old. But no codes it’s killing me. 😆

[@LetsDriftMedia]

Hmmm, I wonder if you have a stuck open fuel injector/multiple stuck open.take out one bank of spark plugs, disable spark, and crank the motor see if excessive fuel is shooting out of any of the cylinders.

[@jakp8777]

How can this be? Consumer reports and the Toyota lemmings tell me Toyota’s are perfect. Must be the suppliers fault.

[@LetsDriftMedia]

Lol

[@xevier6911]

Hey, How do you remove the ECU? I removed the bottom plastic cover (3 plastic clips), then 3 - 10mm screws holding a panel under the glove compartment... but can't remove that panel / trim... Is there a secret screw(s) holding it. I don't want to pull it and bust the tabs or whatever holds it. Thanks

[@LetsDriftMedia]

Depends what year yours is. Some my 94 only has the 3 10mms on the top under the felt glove box material and then you pop the lower clips out with a flat head screw driver.

[@xevier6911]

@@LetsDriftMedia 91 LS400… I guess first generation.

[@javiertorre7396]

Dam that sucks, hope you get a good deal on a used ecu

[@LetsDriftMedia]

Going to try to replace the bad capacitors first and if all fails replace the ECU.

[@kevinlopez6847]

what’s the paper clip trick? cause i’m having problems won’t rev up over 2k , ecu has been rebuilt as well

[@rodrigoaguayo5891]

Did you find the issue because mine is doing the same thing

[@bryanfuentez7640]

Maybe Keith from L1 Automotive Training can help you out with rebuilding your ECU

[@VoltageDropDiagnostics]

Keith is the man! I love that guy!

[@cameron8869]

Have you ever replaced any Lexus or Toyota melting dashboards before? If so, was it difficult to replace or no? Im wanting to replace my 2008 is350 dashboard

[@LetsDriftMedia]

Only the 07 camry era when we had the recalls. I've removed alot of newer toyota dashes there all very similar. That car probably just has more electrical connectors if anything.

[@JamesHetfield-hz9ed]

How much to get a new ecu? Is it plug and play? Going to look at one to purchase tomorrow and it won't go over 35mph, thinking this might be the issue. Is it still with it?

[@LetsDriftMedia]

Dont think you can buy a new one anymore, a rebuilt ECU is around 3-400 rn. and yes simply swap it out with your current ECU and you are good to go, just make sure you get the correct part number that yours has.

[@JamesHetfield-hz9ed]

@@LetsDriftMedia Thanks so much, man. I hope that's all it is or even something simpler. I'd love own one.

[@neverfinished646]

What year ls400 do you have I have a extra ecu is for a 90-92

[@LetsDriftMedia]

Dammit i have a 94. Pretty sure connectors are different

[@nestorlugo.]

I has my boss order some of those cabinets. They had a good sale this past labor day weekend

[@LetsDriftMedia]

Nice hopefully you guys get em soon

[@moocheej9658]

Dude my ls 400 traction control light is flashing on and off, but runs fine, occasionally the engine light comes on, I coded it and it said 02 sensor, what you think 🤔 brother, help please

[@365687]

Hey did u ever find out problem ?

[@jonathanalvarado2657]

Did you end up getting it fixed and what was it?

[@LetsDriftMedia]

Yes, opened the ECU and found leaking capacitors, soldered new ones in and been working fine ever since, I have a second video to this problem posted recently.

[@prodriley]

Don’t buy an ECU online. Their going to give you the same issue. I have a refurbished one right now, popped off the warranty seal and it’s all corroded still.

[@carmine-capalot2251]

Get a flagship ecu that’s had all 6 capacitors changed its 200$ more than some junkyard ecu but is completely rebuilt

[@gervais5540]

I need serious help anyone please So recently I bought this 92 Lexus ls400 and nothing was wrong with it until bout 3 weeks ago it started moving sluggish it didn’t want to accelerate at all so I’m think it could be a spark issue so I changed sparks and coil and still nothing had a mechanic come looks at it and he told me cats was clogged so I change cats and still nothing idk what to do anymore someone please help me

[@LetsDriftMedia]

How does the motor sound? have you checked the timing to see if the timing belt skipped a tooth possibly? checked spark to verify your actually getting spark? done a compression test to see mechanical health of the motor? Checked fuel pressure?Could be alot of things. Wouldnt hurt to pull out your ECU and remove the covers to see if you have any leaking capacitors as well since they are known to cause all sorts of issues.

[@EduardoMartinez-fp6ib]

You still do twitch?

[@LetsDriftMedia]

I havnt streamed in forever lol kind of gave up on it

[@babbypaw9235]

part out? lol jk its prolly just ecu

[@LetsDriftMedia]

🤣🤣🤣

[@QuickAF]

Time for a Haltech!

[@pushhrodd01]

definitely sounded like a tps sensor.

[@LetsDriftMedia]

Im about 99% sure a new TPS wont fix the problem. Ive done it in the past and going to go with my gut instinct, Plus seeing inside the ECu confirmed it even more for me.

[@swamhtet3664]

Hello fellow LS400 owners! Have you guys ever had the problem with engine fan running at the full speed all the time ( no matter the coolant temperature, even in cold winter mornings) ? Mine has been having that problem since a few weeks and I’ve no idea why is that happening. It is really annoying that the fan noise is so loud my car sounds like a pickup truck now. How do you guys think about that issue ?

[@sumperv6645]

Perhaps it’s the fan clutch, I had that exact issue

[@negativeindustrial]

It’s either the temp switch, the fan clutch or the wiring.

[@joshuahernandez2657]

Just bought a ls 400 guy told me everything was fine and it did this smh

[@LetsDriftMedia]

It’s not that bad of a fix if it’s your ECU

[@xkawi543x]

Dammit!

[@xkawi543x]

That sucks!

[@LetsDriftMedia]

I know. Easy fix at least

[@donfrancis1375]

Glad you didnt just send it to josh beaumong like every other fool

[@LetsDriftMedia]

Who is that?

[@gioarteaga3984]

Yeah he's gonna cry in the car.

[@LetsDriftMedia]

Might have shed a tear or so after the video.

[@6spd1uz]

I’m a tech for Lexus if you need an info lmk!!

[@LetsDriftMedia]

Appreciate it man. Luckily TIS has lexus info for me at toyota as well.

[@wtw2103]

Buddys got an ls400 and after replacing ecu sounds blown need help please lmk