DIY - 1.8L 1ZZ-FE TB Connector Chip Swap

[jkuchta]

I've got close to 10,000 miles on my chipped 1ZZ TB, so I don't think it went bad on him.

[PatrickJohnson]

I'm hoping he just removed it because so many are having issues and not because he is being a pissant...

[whooppee777]

i just did a swap last night from the stock throttle position sensor to a scion tc throttle body. i havent put the throttle body on yet to see it worked though. my corolla throttle body didnt set any cels when i installed it as is

[PETERPOOP]

my 1zz throttle body that i put on without switching the chip or adjusting the idle screw and was running perfectly for the last two weeks has just turned gay on me. It started oscilating the other day, and i unplugged the battery, replugged it and it was fine. However, again it is now back to oscilating and i can't disturb it by tapping the gas to interupt it. my only hope now is to do a chip swap; but i don't think i want to.

[eii]

Originally Posted by PatrickJohnson

I'm hoping he just removed it because so many are having issues and not because he is being a pissant...

Na, he always does this. We're not sure why he does though.

Originally Posted by PETERPOOP

my 1zz throttle body that i put on without switching the chip or adjusting the idle screw and was running perfectly for the last two weeks has just turned gay on me. It started oscilating the other day, and i unplugged the battery, replugged it and it was fine. However, again it is now back to oscilating and i can't disturb it by tapping the gas to interupt it. my only hope now is to do a chip swap; but i don't think i want to.

Why wouldnt you? I didnt even bother trying it with the stock 1zz chip since I heard almost everyone's problems being fixed by a swap. Swap it!

[blacksandiegovitz]

Originally Posted by eii

Why wouldnt you? I didnt even bother trying it with the stock 1zz chip since I heard almost everyone's problems being fixed by a swap. Swap it!

Just do the damn swap already Peter

[jkuchta]

Also...adjust the idle set screw and the problem will go away.

[fuji]

I would have to agree Peter, I have been running the throttle body with the chip swap with no issues yet. Never had a cel

[whooppee777]

i swapped the chips from the stock tb to a Tc tb. set a CEL the first day and had oscillating revs and high revs on cold engine starts. after 4 days cel went away and rev issues fixed itself. chip swap ftw

[mick.wheelz]

since OP is a douchbag and removed his shit, I will post my experience with this....

IMO, the 1ZZ TB upgrade is one of the best bang-for-buck mods that us yaris owners can do... What else can you pay $50 for performance wise and actually feel a difference?

Anyway, onwards with the DIY.

NOTES:

From my expirence you MUST do the chip swap... don't be a lazy fuck, just do it! If you dont, it will idle like a pig and oscillate.

Also, the idle screw NEEDS to be adjusted, but be careful, if you cock it up and strip your idle screw like i did, you will need to drill it out and tap in a new one. (You don't want to have to do this.)

Steps;

1. You need to remove your 1NZ TB, its held on by 6x 10mm nuts, and 1x 10mm bolt, you will also need to disconnect the cable that goes into the chip, as well as the coolant lines (be sure to clamp these if you don't want to lose coolant. also, now is a good time to do a coolant bypass.)

side note: for the coolant bypass, all you need to do is take one of the stock coolant lines, disconnect the other at the engine and connect the remaining one on, creating a loop.





2. Remove the stock TB, you will note it does not have a gasket. there is an o-ring in the plenum that it seals against.

3. Here are some comparison pictures of the 1ZZ and 1NZ TB's


1ZZ


1NZ


Side by Side

4. Take your stock TB and drill out the rivets, also do this with your 1ZZ TB.



5. Pull the 'chip' off the stock TB and attach it to the 1ZZ TB.




6. Get some small bolts to hold the new TB chip to the TB

7. Remove the glue from the idle screw and make sure you can adjust it before fitting it to the car.

8. Put the TB back in the same way it came out.

9. Reconnect all hoses and fittings. If you are still using the stock hose/airbox you can simply turn it around (be sure to use some grease to get it to fit on the new TB flange/airbox... you will also need a new PCV hose as the old one will now be too short.





10. If you have not done already, pull the negative off the battery and reset the ecu (just stand on the brake pedal for 30-60sec)

11. Wind the idle down a tad (wind the screw out) and try and start the car, it will fast idle quite high and settle down, ones it has, fiddle with the idle until its back to factory (or close)

12. You are done. The car may oscillate a tad at first and the idle might require re-adjustment, but after 100kms or so, it should be right.

Hopefully this helps :)

[tk-421]

Thanks for posting this info again.

What's the best way to replace a stripped idle screw? It was pretty worn when I bought the TB, and I ended up stripping it completely after a while. I don't think I can drill it (without hurting the TB) since it's pretty much level with the enclosure already.

I'm pretty much used to the high startup idle @ ~2.5K, but it goes down after 20 seconds or so. Not a huge deal, but I might fix it just to make it perfect.

As far as the bang-for-buck comment, I agree this mod is one of the best candidates out there for the Yaris.

[mick.wheelz]

Originally Posted by tk-421

Thanks for posting this info again.

What's the best way to replace a stripped idle screw? It was pretty worn when I bought the TB, and I ended up stripping it completely after a while. I don't think I can drill it (without hurting the TB) since it's pretty much level with the enclosure already.

I'm pretty much used to the high startup idle @ ~2.5K, but it goes down after 20 seconds or so. Not a huge deal, but I might fix it just to make it perfect.

As far as the bang-for-buck comment, I agree this mod is one of the best candidates out there for the Yaris.

All I did was get a big ass drill bit (~10mm) from memory, and drill the whole screw/etc out and tap a new thread.

edit: a pic



You can see the bolt used here. Once i got it right i putt a little glue down it to set it in place.

[tk-421]

Thanks!

I'll probably rethread the sucker once I get the TB spacer installed in the next week or so.

[marcus]

hmmmm...tb...part#

[Astroman]

If you can find a TB with #22030-0D030. I didn't have to do a darn thing.

[suckerface]

Originally Posted by Astroman

If you can find a TB with #22030-0D030. I didn't have to do a darn thing.

Do you happen to have the info of the car it came off of? (year, model, etc)

edit: nvm, found answer in other thread (05 corolla, right?)

[marcus]

can anyone confirm if this tb will work.. 1zz-fe part# 0d110

http://www.khengine.com/servlet/the-...Body-03/Detail

[Astroman]

Sorry that TB won't work for your Yaris, you need one thats DBW (05+).

Yup, mine is from a '05 Corolla.