1uz & 3uz VVti intake manifold. AVIS / ACIS and air assisted injectors explained

[@scottmacfarland6440]

Thank you for such a great explanation of the variable manifold system. I have a SC430 with the 3UZ. The control solenoid had failed. I replaced it but didn't really understand how the system worked until watching this. Thanks! 🇳🇿

[@CartuneNZ]

Glad it was helpful. Cheers Kelvin

[@BrandonSmerdon-i2d]

Hello i'm Brandon living in South Africa, I watch alot of your videos thank you so much ❤

[@andyhander4481]

I never realized the mild similarity in intake systems of my 4age and the 3uz in my ucf30. I have always been so intrigued by the T-VIS on 4age, especially early big port engines, where low end power relied on the plate of butterfly valves between the manifold and ports. Love the videos! Loads and loads of info, often jotting down on a notepad while watching!

[@CartuneNZ]

The concept between the 4age and vvti intake is very similar in concept. I started with 4age way back and then I grew up and discovered 8 cylinder , all alloy and the 4age parts were moved aside for the 1uz. Still like a little 4age in a small car. Cheers Kelvin

[@Lexusturbo]

Brilliant again mate. Need to figure how to blank those air holes off now for aftermarket injectors.

[@CartuneNZ]

Glad my video helped as understanding the system makes it super easy to blank the holes. Cheers Kelvin

[@dapetkov]

9:01 Hi Kelvin, I hope you are doing well. Does the collected oil in any way affect the operation of the engine and if so what should be done to fix the problem. Thanks in advance, cheers

[@BrandonSmerdon-i2d]

Thank you so much for your explanation an experience ❤

[@PoniatBtw]

Thank you for your time put into this. Thats quite a portion of knowledge. I just got myself an 01 LS with the 3uz. It has some kind of problem with the fuel i think. It would start and run fine but when i leave it for half a day, then it may have (not always) a hard start requiring several seconds of cranking and also it won't be liking to run on petrol so it will choke, until it switches to LPG fuel and drives fine. It had some vvti solenoid related codes & missfire, but I cleaned the valve, deleted the codes and nothing popped up yet. Also the car wasnt used for at least a month before i got it, so i filled it with fresh gasoline and gave it a new fuel filter. Thinking about next step in fixing that, cheers.

[@CartuneNZ]

ok. I would be connecting the scanner and checking the live data on as soon as it starts. I would also be checking the basics like sparkplugs , coils , AVIS operation. Cheers Kelvin

[@PoniatBtw]

@@CartuneNZ thanks for your reply. I was thinking about the symptoms (extended crank after a few hour stop & working worse on petrol than LPG) and i was pretty sure that it has to be some fuel delivery issue. Yesterday i took the fuel pump assembly out and put additional gasket where the pump connects into fuel filter and another one where the fuel filter connects to the top part (the original oring here was a little damaged). It felt better on my test drive and also started right away after sitting for about 20hrs. Im hopeful it will stay this way 😁 Cheers

[@fmn716]

It also has a 1uz sump

[@CartuneNZ]

Good spotting George. I have to be so careful as I dont want to put people wrong especially when an engine like this is a bit mixed up. Cheers.

[@ivandeak3702]

Mate you're fkn Awesome!

[@CartuneNZ]

Hello Ivan. Thanks for the compliment. Cheers Kelvin.

[@billygreenhorn9275]

Thank you for explaining those butterfly valves in the intake ! I had no idea how they worked...also I didn't know about air assisted injectors...Toyota V8's really are beautiful engines, thanks again

[@CartuneNZ]

Thanks for the compliment. There isnt much good info out there on the air assisted injectors or the AVIS. I found going through the intake manifold interesting, lot more in there than people realise. Cheers Kelvin.

[@hishamkamal101]

Very informative

[@CartuneNZ]

Cheers. Thanks for the compliment

[@BrandonLy3993]

I apologize if this was mentioned in the video, but if the AVIS solenoid or any component connected to the ECU fails, will it trigger a check engine light? How do I know if mine is still functioning?

[@tufff_695]

Very helpful video i have a 3uz fe wanted to know if you’d ever come across a problem like mine. Okay i have a whistling right upon startup and it does not go away until the engine is off any ideas?

[@tristanmoore2154]

Hi, first off just wanted to thank you for all the info you are putting out there, I'm planning a 1uz vvti conversion on my ln106 and all of these videos have been a lifesaver in working out what I need to do while planning the conversion. My question is, would I be better off keeping the factory FBW throttle body or swapping it for an aftermarket non FBW? I'm wanting to run a full standalone link ecu, I'm not looking for massive power or big mods, the Ute will be used as a work horse and daily driver, so I'm after reliability, low to mid range torque and fuel economy (within reason). Thanks again 👍

[@CartuneNZ]

Hello Tristan. Thanks for the compliment. The stock TB works just fine with a suitable ecu. Ive discussed this in the next wiring video on vvti. It will be out in the next month. Cheers Kelvin.

[@marioosa]

Thank you for this super informational video. Please can you advise how to get to ACIS VSV valve on 3uz ? ... as I have 2 codes popped up (P1651 and P0430)

[@CartuneNZ]

I happen to have a video for you. kzbin.info/www/bejne/jqPXYoeKqsqHicU

[@marioosa]

@@CartuneNZ God bless you. Definitely liked and subscribed 👌. Actually I bought my gs430 over a week ago with these codes and will need to get it done. I'm wondering if faulty ACIS would also trigger bank 2 CAT below threshold issue or is it separate issue ? The car is very low mileage for 2000 year (59k UK miles) and it looks like it last couple of years the servicing on it might have been neglected a bit but it still runs like a champ in general. Although, sometimes its lacking power or shall I say hesitating in range of 2,5 - 3,5k rpms but not always. So possibly the valve needs replacing (?) I'm thinking if the intake gaskets can be reused if they look fine or would the need to be replaced with new ones ? Also - would you have the part number for 2000 gs430 3uz please ? Kind regards.

[@kdfrkdfr]

Yet to watch this clip. I've a 1UZFE VVTI engine and have been told that blocked air assist channels cause shift quality problems with the A650E. Am experiening minor indecision from the transmission before it chooses a gear at low road and engine speeds and when I leave home and roll down the hill with no acceleration the box changes up and then back down, No flare-up, thankfully.

[@CartuneNZ]

I haven't seen transmission issues from Blocked air assist holes , normally I see idle issues. Cheers Kelvin

[@kdfrkdfr]

@@CartuneNZ thanks for your reply Kelvin. This thread brought me to this video. It's longish and if you don't have time to read it that's alright. Cheers, Kevin. www.clublexus.com/forums/ls-1st-and-2nd-gen-1990-2000/953534-a650e-shift-quality.html

[@explorehunter]

Hi there, thanks a lot for the very informative video and well detailed explanation! Enjoyed while learning new things.🌹👍. I want to replace my 3uz's vaccumme canister and vsv valve. Can you please help me on where to start and tools and parts required for the job. Do I have to remove any hoses, pipes, wires as well? It has 290k miles on it, so please recommend me on what else might need to be replaced along with them for good since I have to lift up the intake manifold. Do I need to replace the hoses if they are brittle?, what size/spec are these hoses?

[@CartuneNZ]

Hello. I must focus on my paying jobs but have a video of that exercise here. kzbin.info/www/bejne/jqPXYoeKqsqHicU

[@explorehunter]

@@CartuneNZ Thanks for the response.. I've seen the video and it's great. But thing is your engine is mounted on a stand and mine is inside hood 😀. It would be very helpful and much appreciated if you can do a video of the same for under the hood engines. Mine is a 03 GS430, it has codes P0420, 0442 & 0456 for a long time and it wouldn't go! 😢. Carry on with your works, and please do a video when you have time to do👍❣️. Have learned a lot from your videos. Take care. Cheers and thanks!

[@CartuneNZ]

@@explorehunter to me its the same job regardless of whether is in the vehicle or on a stand. He's the same job in a engine bay. My man flicks them apart fast. kzbin.info/www/bejne/rYismX2jmth3rJY

[@explorehunter]

@@CartuneNZ Thanks dear 🌹👍. Appreciate a lot for the support and info! Wishing you all the best and take care.

[@MrSilzla]

I'm currently doing a 1UZ vvti conversion into a Hilux and your videos have been a huge help, thank you! I've heard custom intake pipes can effect the fuel trims pretty drastically, I don't have the factory air box, do you have any recommendations on fabricating one? Size/length etc.

[@CartuneNZ]

We have the afm housings in stock. For the rest as close to factory as possible

[@joses5388]

Hi!! Your videos are awesome!! Could you help me with a 3uz vvti stock and I’m trying to tune it so that it reaches around 330hp! Could you tell me where to start !!

[@CartuneNZ]

Ok. 330hp engine with improved exhaust, quality air filter into the box and reflashed ecu (or aftermarket ecu) Done. More 3uz stuff coming soon.

[@joses5388]

CartuneNZ thank you! Air intake I purchased is coming in tomorrow! I know I have to tune my Ecu after so what else should I do!!

[@CartuneNZ]

@@joses5388 if you want more power then camshafts. Also ensuring all the maintenance is up to date.

[@joses5388]

CartuneNZ thank you!! Could you recommend a specific brand for my 3uz vvti?

[@CartuneNZ]

Being that I'm in NZ we tend to use kelford cams.

[@jesiahsydow9301]

I have a question I was hoping you could help me with I’m running a 2500 elite haltech ecu with the premium flying lead and I’m doing that Avis wiring is it just ignition 12 V power And input ground

[@CartuneNZ]

Correct, like most solenoids a power and ground. Cheers Kelvin

[@jesiahsydow9301]

@@CartuneNZ I’m sorry wiring is hard is this fine so a B16 ground with a green stepper wire or should it be like ignition 12 V power from A26 and a green stepper wire cause I’m confused if the stepper wire is a ground

[@CartuneNZ]

@jesiahsydow9301 I have wiring videos for aftermarket ecus. Otherwise, I do book out personalized time for a fee.

[@quentinwheeler8531]

Is that screw atop the fuel pressure damper adjustable? Or is it pre set and not to be tampered with?

[@CartuneNZ]

Screw is not adjustable. Not to be tampered with. Cheers Kelvin

[@Mindmelter92]

I'm currently putting a 1uz vvti into my volvo 240 😁..is it possible to deleate the acis system, take out the butterfly valve section and leave it open and get the engine tuned for it??

[@CartuneNZ]

Absolutely possible to remove. It reduces the lower end torque massively and gives a horrible dead spot at the normal switch point. Stock vvti ecu can not be tuned easily, or in a viable fashion. If you want to remove the avis go ahead but when they come into my shop with it removed I refit the system.

[@Mindmelter92]

@@CartuneNZ thanks for the reply, ill be going with a stand alone ecu and is going into a volvo 240 😄, just done timing belt kit and water pump ect thanks to your videos, much appreciated!👍

[@andrewmontiel7168]

Hey man just wanted ask to confirm is the intake manifold made out of pure aluminum? I’m wondering because I’m loooking to paint mine

[@CartuneNZ]

If you look at the exact definition of "Pure" aluminum I think you will answer that question yourself to find the intake is not "pure" aluminum. It is however made of Aluminum and that shouldnt cause any issue for painting if the correct techniques is used. Cheers Kelvin

[@talentomaposse8007]

Please l need help for my 3uz l have outside pump but l keep changing after 5 weeks

[@unixsas]

Very good video, Thank you! We are struggling to get my 3uz passed 260 hp, it feels like something is preventing it. I have this vacuum solenoid blocked off and the flap not connected. Is it because of that we cannot get it passed 260hp? If so, is there a way of bypassing this flap or does it have to be connected and functional?

[@CartuneNZ]

I always connect this system and have it functioning correctly. With it not working you are missing out on bottom end torque and it also improves the rate of acceration of the engine so makes it gain revs faster. Are you on a stock ecu? Manual or auto?

[@unixsas]

@@CartuneNZ I am running a fully standalone ecu, its in my drift car running manual gearbox. I don't need low RPM as such, it's constantly above 5k RPM anyway

[@alonzoayala7894]

Will the vacuum canister cause the motor from not starting if broken?

[@CartuneNZ]

Unlikely. Id expect the engine to still start with a broken canister

[@justinae86man]

Question, with a 3uz is the main throttle body dose it control the idle or is there a ICV somewhere? But If I change it to a cable type throttle will I need to run a ICV ?

[@CartuneNZ]

Yes the 3uz is a full drive by wire unit. I always recommend running a IAC on all engines. Cheers

[@jaylockwood8417]

Is there a vacuum canister under the 1uz vvti intake manifold like the 3uz?

[@CartuneNZ]

absolutely Yes. Cheers Kelvin

[@LeviEnnen]

Are 1uz and 3uz intake manifolds interchangeable? I only see ITB kits for 1uzs

[@CartuneNZ]

Yes, 1uz vvti and 3uz vvti intake manifolds are interchangeable, the 1uz vvti is not and I have a video on that.

[@LeviEnnen]

@@CartuneNZ is 3uz-FE vvti? (I have a 2001 gs430)

[@CartuneNZ]

Yes, 3uz have vvti.

[@mattsmith7590]

Hey mate my 1uz just putted out it's got a stock ecu I was going pretty hard on it & it just cut out fuel seems to be coming through motor is turning but no go ?

[@CartuneNZ]

Hello Matt. Time to do some diagnosis. Checking power feeds, spark etc. Cheers Kelvin

[@jaylockwood8417]

Hi I have a 99 sc400 with the 1uzvvti and I have an engine code p0446 that has came up a couple of times. Do you think the solenoid underneath the intake manifold could be causing the code p0446 ?

[@CartuneNZ]

its always a possibility but I would think a small one. I would be checking the evap system more carefully. Often that code is a faulty solenoid itself. Cheers Kelvin

[@jaylockwood8417]

@@CartuneNZ what solenoid would you recommend checking for starters?

[@jaylockwood8417]

@@CartuneNZ I mean what solenoid is it that usually causes the p0446 code?

[@CartuneNZ]

The evap solenoid solenoid, which is what the code is for.

[@1uzsurfnz670]

I’ve got a Gen 1 1UZFE with being Forced induction by means of a supercharger. Thinking of upgrading my injectors. What do you recommend?

[@CartuneNZ]

Hello. Something bigger. Estimate horsepower and go 1cc flow per injector per horsepower is a good start. With supercharger then a bit extra for safety as often you end up cooling the air with the fuel charge at higher air temps. Find a local injector supplier with good backup for their product. I try to get accurate deadtime numbers to input into ecu if tuning modeled fuel equation. Cheers Kelvin

[@desertrcaz]

Okay well I Room removed my flaps and Runner bars for the ABS system because I figured that the computer doesn't run it anyways considering I'm running a standalone so that's going to hurt my power you think

[@CartuneNZ]

Do you mean you have removed the flaps from inside the intake manifold?

[@desertrcaz]

@@CartuneNZ yes I remove the flaps and the bar that goes through at 2 again because the Mercury II spitronics Mercury 2 stand alone ECU doesn't control the actuator of any kind so I figured they were just Dad room in there so I removed them

[@desertrcaz]

And the reason is the last engine I had in there ran off of a Mercury to stand alone and it didn't control those slaps either they were just in the way I figured so I took them out they're useless they weren't doing their job

[@CartuneNZ]

Ok. By doing this it makes a very noticeable reduction in bottom end power and torque. I had another customer do the same years ago and when the car was on the dyno there was a big reduction in the bottom end performance. Its common for the solenoid to fail and I have lots of people replacing the solenoid to make they system function properly again and all notice how much nicer the engine are to drive with everything working. Maybe you have chosen the wrong ecu as by doing what you have done you have lost power, torque and fuel economy. Cheers Kelvin.

[@Boostlifelex]

So if you switch the intake manifold from a 3uz and put that onto a 1uz will it make more power?

[@CartuneNZ]

The intake between a 3uz vvti and 1uz vvti are almost the same. Just some air holes between throttle body and manifold which are different for emission breathers. No power gains 3uz to 1uz vvti. Cheers.

[@mhmdbnmhfoz]

Can i use 2uz vvti intake manifold on 1uz vvti ? if yes what parts do you need to swap to make it happen ?

[@CartuneNZ]

Hello. I have never done it myself as 2uz arent so common over here however there is a thread on lextreme forum of a guy that has done the swap to the plastic intake. Some time on google you should find it. Cheers

[@kendy531]

Does 1uz manifold fit on a 3uz?

[@CartuneNZ]

Watch this. kzbin.info/www/bejne/Y5_ac6qrer15bNU

[@kendy531]

@@CartuneNZ thank you.

[@FlaccidPancakes]

which city are you located in mate?

[@CartuneNZ]

Not sure you have noticed there are no building in the background and its all farm and bush as Im not in a city. Very rural in the south waikato in nz. Cheers Kelvin

[@FlaccidPancakes]

haha sorry what i was meaning was which area of nz were you located in 😂 im located in auckland. Any chance you may know of anyone who has any unwanted supercharger manifolds for a 3uz laying around? mines a 2006

[@CartuneNZ]

Im in the middle of no where between Tirau and Rotorua. I may just happen to know of a complete Super charger setup for a vvti. 3uz and 1uz vvti interchange. Check out the twin turbo lancer video. The prado setup is for sale soon around $6k. Complete manifold, charger, injectors, water meth setup. Cheers Kelvin

[@FlaccidPancakes]

Cheers 😁 keep me updated. id love to see that lancer in person, it looks mental!! haha

[@CartuneNZ]

@@FlaccidPancakes if interested in the charger setup then flick me an email with your phone number and I can pass it onto Les. If someone has the cash he will flick it off but can be heard running first. Email in recent videos description. Cheers

[@saulhernandez1953]

No wonder my 3uz lost power because the canister switching valve is not working

[@CartuneNZ]

My own car has the same issue. Cheers Kelvin