4ZZ to 1ZZ Parts Upgrade Detailed How To Guide Throttle Body, Injectors, Intake Manifold

Join me as I stroll down memory lane and fit 1ZZ-FE parts to my old 4ZZ-FE Corolla E11. 1ZZ Throttle Body, Intake Manifold, and Fuel Injectors can increase HP by up to 26hp.
Credit to‪@schtekar‬ for some of the nice shots of the modification install.
Part Numbers:
1ZZ Celica Throttle Body = 22210-22070
1ZZ Celica Intake Manifold = 17120-22010
1ZZ Celica Injectors = 23209-22040
1ZZ TPS connection for sale:
a.aliexpress.c...
4ZZ TPS Connector for sale:
a.aliexpress.c...

[@wheresthegrillcheese]

You forgot to mention about getting a dual pipe exhaust for the car. Dual pipe will help release the gases to the chamber faster slightly giving more rev. Not by a whole lot but theres very small difference to it. Worth mentioning.

[@HobTecCars]

True, I actually had the car Dyno'd before I had the Exhaust system in place and it returned 113hp. That was also using 1zz inectors which was Rich burning.

[@Motorbikes-c6b]

I heard it's plug and play (e12 3zz to 1zz) if you use an Avensis manifold and throttle body and a Corolla Verso air intake hose. I'm interested in doing this but would like to check this is true because I don't fancy messing with wiring and vac pipes at my skill level.

[@squuuare]

Thanks a lot, this guide is very good!

[@HobTecCars]

Thanks a million, that means a lot :)

[@sergiopereira1041]

💯👌👋Thanks a lot, this guide is very good! Good. I would just like to know if the 119 HP were obtained with the 1ZZ injectors or the 4ZZ ones. Thank you very much.

[@HobTecCars]

Thanks alot, really appreciate it

[@HobTecCars]

The 119hp was obtained with 4zz injectors..I think I achieved about 113hp on the 1zz injectors. Importantly, the 1zz injectors made my car run rich though

[@sergiopereira1041]

113HP with the 1ZZ; It is 119 with the 4ZZ. Right? Or was it the other way around!!!! Thank you very much for your attention.

[@HobTecCars]

@@sergiopereira1041 Exactly that 113hp with 1zz injectors. 119hp with 4zz injectors

[@sergiopereira1041]

And what about consumption? Did you spend more or spend less?

[@tcommonsense]

Awesome video mate. Got the same Corolla in *almost* mint condition, silver, make 2000s ,1.4L VVT-I 4ZZ-FE. Doing some preventive maintenance these days , replaced plugs already (big improvement), cleaned the MAF and next planning to disassemble the air intake manifold to address an air leak issue (When you spray Carb cleaner near the intake manifold - revs go down and car chokes, only when cold=air leak nearby). Already bought the 17171-22030 Elring gasket. From the video I've learned a lot (I'm an amateur in this area, but enthusiastic to fix my own stuff). Any other parts you can recommend/suggest that I might need during this process, or some tips you can give to make it easy for a first timer?

[@HobTecCars]

Thank you for the lovely compliment, it really makes my day. Good work on tackling the maintenance yourself. While you are doing this type of work I'd recommend the following. 1. When fitting the intake manifold gasket. Some PH neutral soap like Fairy liquid make help put the gasket 17171-22030 in place if needed. 2. While you have the intake manifold out I'd spray crab cleaner down each of the 4 small plastic intakes on top and wipe down any excess black carbon with a microfiber cloth. Do the same for the main part of the intake manifold on the side that connects to the throttle body. 3. While you have the intake manifold out, spray carb cleaner all over the inside of the throttle body and wipe away the black carbon. This will improve airflow into the engine. Use your hand to open and close the throttle manually. Ensure the spray doesn't touch the MAF sensor. 4. Finally, I'd consider changing the throttle body Idle Air Control Valve Gaskets while you have these parts out. I've a video coming on this in a few weeks time so keep an eye out. Parts are: TOY-22215-7A680 You need to remove 3 or 5 Philips Head screws in the throttle body. And the I.A.C.V essentially pops out in 2 parts. Remove the old gaskets, carbon clean the whole IACV area. They are usually seized with carbon and dirt. Make sure the magnet can spin freely in your hand. Install the new gaskets. And put back in your car. These few things will ensure your 4zz-fe runs like a dream.

[@tcommonsense]

@@HobTecCars Roger that.

[@tcommonsense]

@@HobTecCars Question though : since the IACV has some coolant pipes going in/out of it - how worried should I be disconnecting those and letting some of the coolant leaking out while attempting to clean the actuator/magnet from carbon buildup?

[@HobTecCars]

Fair question. If you are disconnecting coolant pipes you will loose a small amount of coolant. When removing the pipes have a friend block the pipes or pinch them or tape them to stop them draining. Then once the IACV is refurbished and everything is back on the car. Remove the radiator cap and let the car idle for an hour. Air bubbles in the coolant will bubble out safely. Then reinstall the radiator cap and top up the coolant in reservoir (if required) When idling the car if the front of the car is slightly elevated on a hill it is better. As the air bubbles from the coolant will remove themselves easier. Happy DIYing

[@tcommonsense]

@@HobTecCars Alright. By the way, I've been searching all day for the additional gaskets 22215-74400 and 22271-22030 (as per my VIN and car model) but for the life of me cannot seem to find anything available and deliverable Belgium without being some crazy 30+ days delivery time and costing 10 times the price of the gaskets. Do you have some European websites/vendors that you can recommend that still sells parts for old cars like ours?

[@a2d600]

Thank u so much, i just ordered some of the parts so i can do this upgrade. but i won't run the 1zz injectors since i heard that it may cause the engine to run to rich and that the 4zz injectors where eneugh. i will update when i got the parts!

[@HobTecCars]

You are very welcome. I make videos for folks like yourself. Enjoy!

[@a2d600]

@@HobTecCars i was just wondering, the 5m in total with the hoses do u actually need it or is it just for show? cous looking of the pictures it just looks like the normal ones got replaced.

[@HobTecCars]

@@a2d600 You don't need that much hoses. But the seller only sold them in 2m lengths so I had lots to spare. The true length of the hoses required was about 2.5m. It was useful to have spares though for other projects :) But yes, you only need to replace the original hoses

[@a2d600]

Oh okay thx, man@@HobTecCars i really apreciate it and all the help u provided already!

[@a2d600]

@@HobTecCars update, car is still the same haha, i bought a intake manifold from a celica but came broken and seen it to late and noticed the throttle body of the celica doesn't rlly look OEM to the 4ZZ possition so i ordered the mr2 pieces. Now i tried to start the intstallation today but noticed the throttle body positions censor isn't the same like the 4zz so looking to fabricate a connector from the 4zz to 1zz. ps i also ordered an k&n airfilter but also wrong so haven't had a lot of luck😅😅. greetings from ur Belgian friend!

[@jimtsn8394]

Hi! Im looking forward to doing this mod to my 4ZZFE Corolla too. However, i was thinking of keeping the 4ZZ’s fuel injectors. You said you did the dyno run with the 1ZZ ones but then swapped the old ones back in. What was the difference between the 4ZZ and the 1ZZ fuel injectors? Do you think you lost hp with the 4ZZ ones instead of the 1ZZ?

[@HobTecCars]

1zz Injectors were making the car run rich was bad for the CAT. I think with 4zz injectors my fuel to air ratio was better. I think there was 3hp loss with 1zz injectors vs 4zz.

[@jimtsn8394]

@@HobTecCars thank you for the help and the video in general. I will consider these when buying the parts

[@laid8814]

Hello! First of all - great video I’ve got an E120 (e12 5 door) with the same engine (4ZZ-FE) and have a few questions. I’ve managed to source a celica 2002 throttle body and inlet manifold , part numbers all match up. Regarding the wiring of the TPS - you say you can source the male connector from the celica loom to then plug the wires into - if i cannot source one of these what do i do? Also - what size diameter is the silicon hose if you or anyone else knows? Did you give the inlet and throttle body a comprehensive clean before you put them on too?

[@HobTecCars]

Hi thanks for the compliment much appreciated. I can help you out a lot I think. So first thing is first. I've never done this mod on a E12 but the process should be 90% the same. A good friend of the channel has bought the 1zz male TPS connectors from Aliexpress. The part links are in the description. They worked perfectly for him. He hand wired his 4zz TPS loom into that connector. The Airbox pipe diameter I used for an E11 was 76mm in diameter. This was a perfect size for the 1zz throttle body. On the Airbox size it was a little loose. But a simple Hose clamp worked perfectly to seal it tight to my airbox. Finally, yes I comprehensively cleaned the Throttle Body, IACV, and Intake Manifold before install. I recommend doing it if you have the time. My car honestly ran like a new car after, I think it made a difference. Follow me on hobtec_cars Instagram and message me there for any further help I can give.

[@laid8814]

I’ve sent you a message over on instagram. I’ve managed to source a male plug for the tps from a celica. However is the idle air control valve plug changed at all or will that be the same as what is on my car already?

[@rarissimee]

Hi, Thanks a lot for ur content, the guide is on top but i have still a question about the car parts : Is it obliged to take celica 1.8 vvti parts or can we take from other models like verso/avansis ? (still in 1.8L vvti) cause other throttle body for exemple looks different than yours shown in video. Cheers from France !

[@HobTecCars]

Thanks for the compliment. :) You are not obliged to take Celica parts. MR2 1zz and Avensis 1zz I know for a fact work. However. You must make sure the Throttle Body isn't electronic. (The Celica one isn't so that's why I recommend it) The Avensis and Verso sometimes came with an electronic Throttle Body.

[@rarissimee]

@@HobTecCars ok, thank you for the answer ! I'll come black here to give some news when i'll swap the parts ;)

[@heezyhvps]

@@HobTecCarswhy i can’t use a electronics throttle body? Thanks!

[@aitorreyesperez]

for my e12 I just simply used Avensis parts, because is just plug and play, no modification is required, and Corolla verso air hose! also plug and play!

[@HobTecCars]

Thanks for sharing that. It might help someone else.

[@aitorreyesperez]

@@HobTecCars I made a document long time ago where i included parts reference I used, if you have email or Telegram i can send you

[@HobTecCars]

@@aitorreyesperez Hi, grab me on my Instagram please ' hobtec_cars ''

[@heezyhvps]

Is it “plug and play” more legal for inspections?

[@aitorreyesperez]

@ I have already passed 2 or 3 inspections with 1zzfe parts without problems in Spain.

[@alexisisdowntuned7624]

Just curious man where about does that T joiner piece go on? Been looking through the video and couldn’t really tell 😅 brilliant video otherwise!

[@HobTecCars]

Thanks, I don't have footage of it. So that's why I couldn't include the steps. I think its only required if the intake manifold was taken from a Celica. It's nearly invisible. On the bottom right of the manifold near the radiator cap there is a tiny black nipple. This is where you'll need to run a 4mm hose to. Then, connect the bottom of the T joiner to that 4mm hose. Then simply connect the T joiner to the 8mm vacuum hose that was already on your 4zz or 3zz. If you send me your email address I'll send you a picture of exactly the location

[@J11P338E]

Thank you very much.

[@J11P338E]

Do you mean you cannot connect throttle position sensor connector from 4ZZ to 1ZZ throttle body without mods?

[@HobTecCars]

@J11P338E Yes, in the E11 Corolla with a BOSCH ECU anyways. Maybe the E12 Corolla is easier?

[@orbitaaltube]

Geat instructions there lad. Im based in ireland myself and run a channel around repairs and with a few corolla videos in there for good measure. I daily a tsport but my mrs has a 4zz 05 hatch and i have often wondered about the specifics of how to go about the 1zz mod. One thing that would be important for me is a completely stock look so would be interested to know if the 1zz air pipe to the airbox is a straight fit of whether a reducer would be needed. Did you ever see any negative effects from running this mod over time?

[@HobTecCars]

Thanks for the compliment, appreciate it a lot. The 1zz airline for a Celica will fit, but best to trim a bit of the end of with a saw as it's really too long in the 4zz engine bay. This was the mod will be OEM looking. No negative effects I noticed on my car. Ran the mods for 4 or 5 years and drove 35,000 miles with them. If anything.... my car ran better with them.

[@MightyIsaac]

im interested in getting a 1zz-fe full engine complete build from a mr2 mr-s spyder roadster for my e12 corolla 4zz swap is it recommended please thanks!

[@HobTecCars]

Many people have done it. If the engine is from an MRS the JDM ECU needs a custom witing harness. If possible a MK3 MR2 or Celica would be less tricky of a swap. I personally know 3 people who have successfully done that swap.

[@HobTecCars]

This guy is the person I'd contact. Steven Williams. facebook.com/profile.php?id=100057523446511

[@MightyIsaac]

appreciate it mate !@@HobTecCars

[@superjojo555]

Thank you for this great video sir. Did you notice any changes in the long term and short term fuel trims? i am planning to slap the 1zz throttle body and airducts on my mums car lol

[@HobTecCars]

@superjojo555 Thanks for the nice comments. Short term the fuel efficiency is less than normal. Maybe a -3 or -4mpg. But longterm, after the ECU learns the setup I found my MPG improved with the 1zz modifications. After 200 miles the ECU learns the setup. I saw a slight improvement of MPG. Maybe +1mpg difference. That improvement in fuel efficiency may have been down to my cleaning of the parts and having new gaskets fitted.

[@superjojo555]

@@HobTecCars Thanks for the quick response! have a great day sir.

[@danielhartai8219]

Helloo, great video and modification, but what type of water cooler you have? With the factory cooler there is no enough place for the main cooler hose, so I can't do this mod.

[@HobTecCars]

Thanks for the compliments. Not sure what you mean by water cooler? I am running the standard cooling system on the E11 Corolla. The Radiator hose from the radiator to the engine will fit fine, it is a little tight, but I promise it is fine.

[@danieloconnor6594]

Important to depressurize the fuel system before opening.

[@mark_daly]

How does this effect fuel economy? I'd be interested in giving my 1.4 e11 a bit more umph but would like to be able to keep the 40+mph it's giving me

[@HobTecCars]

I found it actually improved my mpg by 0.5mpg. I think its because everything was cleaned going in like the throttle body and intake manifold. I had a nice system where I'd a CAI intake into factory airbox which helped too. It depends on how you drive. But no drastic change to MPG eitherway

[@frjoethesecond]

Did you have any problems with the NCT or insurance? Did you revert the mod before each test or declare it at any point?

[@HobTecCars]

Great question. No problems with the NCT. The cars emissions were perfect after the modification. I drove this car for another 3 or 4 years after these mods with no issues. As for insurance I went about it the legally correct way. I got a SIMI approved dealer to do an Engineers Report on the modifications. I submitted that to the insurer and everything was above board. No increase in premiums or anything like that. Just declared openly and honestly.

[@frjoethesecond]

@@HobTecCars That's good to hear. Thanks for the video and for answering our questions. Have a great 2024.

[@sktos4046]

Just curious what insurance company you went with for declaring mods and im struggling im 23 with 2 years no claims thanks ​@HobTecCars

[@HobTecCars]

@sktos4046 At the time it was Liberty Insurance. I'd 5 years no claims at that point. The key for me was to get a SIMI Engineers report

[@ArtUltraInstinct-v9g]

Hello, I have a Toyota Avensis T25 1.6 2008 Manual 5 Speed 3ZZ-FE. Today I made a swap Throttle Body from Toyota Avensis T25 1.8 2008 1ZZ-FE. I also changed the hose from 1.8 because the hose from 1.6 didn't fit on the 1ZZ Throttle Body. I disconnected the negative battery when I did the process than put it back again when finished. The car was revving up and down to learn the 1ZZ Throttle Body, but now it idle at 1000 rpm. Before was idling at 650/700 rpm. What could it be? Thank you.

[@HobTecCars]

Not sure of the issue without seeing the setup. By the sounds of your comment, you didn't use a 1zz intake manifold?

[@ArtUltraInstinct-v9g]

@@HobTecCars Hi, I changed only the Throttle Body 1ZZ-FE and the Intake Hose, because the Intake Hose from my car didn't fit on the 1ZZ Throttle Body. Every time when I start the car in the morning, it revs up and down about 3 minutes than it goes down slowly at 1000 rpm. When I turn on the lights and the air condition the rpms goes down at 700 rpm, but when I turn the lights off and air condition off the rpms goes up again at 900 1000 rpm.

[@stevenbyrne7593]

Did u use the standard coolant pipe I heard they get squished with the bigger manifold, i see ye have a bit of foam there to stop it rubbing is it?

[@HobTecCars]

Yup standard coolant pipe was fine. I meant to mention that in the video. I just used some foam to stop it rubbing abrasively off the intake manifold. A perfect solution would be to replace that fix with a slightly more flexible one. I drove the car like that for 3 or 4 years with no issues

[@stevenbyrne7593]

@@HobTecCarsgrand job thanks very much , engine bay was immaculate in her👌

[@HobTecCars]

@stevenbyrne7593 Aye, I miss the car. The entire car was flawless.

[@CorollaSR]

Were you on Toyota owners club Ireland back in the day ? Rex Banner ?🤔

[@HobTecCars]

I was indeed, they were great days, a brilliant club and forum.

[@CorollaSR]

@@HobTecCars @HobTecCars I remember watching your build very closely because you have a lot of knowledge of Toyota and all the rare parts. Would you believe you and some guy in the UK inspired me back in the day. I had 2001 Corolla SR, you know basically the face-lift G6R. It a was nice red one with a genuine TTE stamped spoiler, red G6R seat belts and stupidly rare white TTE alloys, produced by MiM. Just changed my profile pic to it. Glad I found your channel, best of luck with it!

[@HobTecCars]

That's really cool to hear. I know the other guy you are mentioning. His username was steven252, he still runs a store building ZZ engine wiring looms. Your car looks lovely, on Irish plates too, very exciting. The MIM is a lovely wheel for the E11, essentially a WRC spec. I want to do a video on the full E11 lineup at some stage. It'll take a while to put together. I want to do one on the Toyota Levin ae111 next. I will definitely buy a G6R someday. Just need to shift a few others cars :)

[@JoseOrtiz-zx8sf]

Those Toyota See-Leak-As* are awesome :).

[@HobTecCars]

Haha 😄 Regional differences in accent. I used to say that but everyone corrected me to use: "SELL-EAK-AHS"

[@charlienevin293]

Gona, do this mod on mine. What did you use to pain the engine cover ?

[@HobTecCars]

@charlienevin293 I sanded it with 1000k grit sand paper, used plastic primer of a white colour. Finally used Toyota Super Red 3e5 as the colour on top. Used a laquer then to seal it all in then

[@BenJamin-ud9ux]

I’m going to do this on my 3zz 1.6vvti. I was wondering if I stroked the engine to 1.8 could I turbo it?

[@HobTecCars]

Hi there, short answer is YES. However, stroking these engines is fairly involved. By the time you buy a 1ZZ crankshaft, Pistons, and Con Rods and factor in labor costs..... you could have bought a whole 1ZZ-FE for the same cost. As regards Turbo-ing the engine, either stroked or factory low PSI boost would be best. The 1zz is a light block, TTE made a 1ZZ Turbo kit in Germany running low boost to make 180hp on the 1ZZ.

[@jollysouse]

Hi just a bit confused on where the t joiner goes, might be sounding stupid here but what does it connect to? As in which pipes etc

[@HobTecCars]

Hi, it depends on which intake manifold you have bought for the modification. I used a 1zz Celica one which has an extra vacuum inlet. It's located on the bottom lower right of the manifold. It's very small and about 4mm in diameter. The bottom of the T Joiner connects to that. Then the Left and Right sections of the joiner just run into join the pre exisiting vacuum lines that are already on the 4zz or 3zz. You will see these when you remove the throttle body and intake manifold. They are about 8mm in diameter

[@jollysouse]

@@HobTecCars thanks a million bud!

[@MihovIlian]

Hi, how did this affect your fuel consumption?

[@HobTecCars]

Hi, for the first 200 miles fuel consumption was up maybe 10%. But once the ECU learns the modifications I actually had a fuel economy increase of about 3%. I was achieving about 43mpg to 44mpg with the 1zz parts.

[@MihovIlian]

Thanks, I wanna put a 1ZZ intake on a 3ZZ motor on a 2005 Avensis and was worried about that bit. Not anymore

[@LewyDGAF]

Hi bro , i have a question to this , i have 3zz fe corolla 2004 and want to do this mod and i have a electric throttle in this , should i go for 22210-22070 or 89452-35020? You said 22210-22070 is for a manual ,so does 89452-35020 goes for automatic gearbox?

[@LewyDGAF]

and the most important question - is it any diffrence between this two throttles?

[@HobTecCars]

Hi there, I've been thinking over your question the last 24 hours and it isn't a simple answer. I'll try to be clear as I can. You cannot use the part number I've listed for the Throttle Body. If your car is an automatic with an electric Throttle Body you'll need to buy that version. It is completely different vs the manual version. See an image here on the right. uploads.tapatalk-cdn.com/20170220/4b3d1c6d79c50b4accd7025170fd14b0.jpg Then in theory you ou need to wire your 3zz throttle wiring loom into the new 1zz throttle body. I don't know of the wiring matches up so you might need to create a custom loom to match up the wires. The part number you gave me '89452' is just a Throttle Position sensor. It won't do anything to help the situation. In Europe, there are very few Automatic cars from this era. (I've never seen a ZZ engine in Auto) HOWEVER, I'm sure someone in the world has done this swap with an Automatic (Electronic) Throttle Body. I'm sure some searches from US websites or Facebook groups will have the answers you need. In my head it should be possible to does this swap, I just don't have the hands on knowledge to help you. Hope that helps a bit, thanks!

[@LewyDGAF]

@@HobTecCars hi bro , i did this mode , does you fix rev hunting like in all way? I have rev hunting at cold engine , then on warm i goes from 800 to 1100 rpm

[@lungelomhlengi8801]

Hi guys please help on how to connect vecum pipes it’s a 3zz engine

[@HobTecCars]

Hi, sorry I can't help you there as this car is sold, otherwise I'd go into the yard and check for you.

[@lungelomhlengi8801]

@@HobTecCars Thank you please

[@jaggass]

Does the 1ZZ mod make more torque and mpg?

[@HobTecCars]

1% to 2% better MPG, torque was largely unaffected with 120 to 130nm. Same as factory specifications

[@jaggass]

@@HobTecCars My engine has 96nm so with the 1ZZ-FE parts that will go to 120-130nm?

[@HobTecCars]

@@jaggass Possibly? If you follow my I.G. I can send you my Dyno runs

[@jaggass]

@@HobTecCars Will do i want a bit more pulling power as 4ZZ FE's don't do much under 3000 rpm.

[@jaggass]

@@HobTecCars Im going for the 1ZZ FE parts. Already bought 1.8 manifold and airbox pipe. Getting the throttle body soon.

[@V.LEPPA222]

hello, can i use the oem piping for the throttle body?

[@HobTecCars]

Hi there. You can't use the 4zz OEM pipe for the Throttle Body. It's diameter is too small. You need to use the 1zz OEM pipe. That will work perfectly with the 1zz Throttle Body.

[@V.LEPPA222]

ok, i have now gotten all the piping and also ordered the manifold+tb, will it give me a check engine light or other trouble if i use the stock 4zz injectors? thanks!

[@HobTecCars]

@V.LEPPA222 Great. No it definitely shouldn't if done correctly. I ran my 4zz injectors for 6 years with 1zz mods with no Engine Lights

[@V.LEPPA222]

ok, thanks. i subbed. i will tell you how it went😁

[@V.LEPPA222]

hello, i have now receives the parts, they are from a avensis 1zz. i noticed that i have 2 electric connectors on the throttle body, is this normal?

[@AzamT1914]

Can I get the 1zz parts from an e12 Corolla?

[@HobTecCars]

Hi, that should work. But as far as I know there was only a 1zz corolla in the US, New Zealand and Australian markets

[@AzamT1914]

@@HobTecCars yeah I thought that ended up getting scammed by a lad who was gonna send me the parts from america took the money and blocked me

[@HobTecCars]

​@AzamT1914 That's a shame, where are you based? If you payed with PayPal you are insured for scammers like that

[@AzamT1914]

@@HobTecCars Ireland. I did pay with PayPal so think I’m covered but it takes a while to process, I was also wondering how much the parts cost you back whenever you did the mod

[@HobTecCars]

@AzamT1914 That's great, gosh it was over a decade ago. I think they cost about €60 including postage from the UK.

[@kareemahmed3358]

Can 1zz intake manifold be compatible directly with 1nz motor ?

[@HobTecCars]

Hi. To the best of my knowledge it isn't. I know some folks swap the 1NZ Throttle Body with one from a 1ZZ. As done here: kzbin.info/www/bejne/h3XXfp1_m9OWrrMsi=utqDwpujBXRaj13q I imagine the power gains are quite minimal with that type of mod since the Intake Manifold is still quite narrow despite the wider Throttle Body.