How To: Install Throttle Body

I picked up a bigger, 69mm throttle body from Mace Engineering the other day, and was keen to install it!
So, here's the write-up:

First thing's first, make sure you have all the right tools needed to do the job.
What you'll need:
- 10mm & 13mm Spanner (or socket's with wrench)
- Flat head screwdriver
- Phillip's head screwdriver
- Torque wrench (with 13mm socket)


You'll also need to purchase a new throttle body gasket from Holden. They cost $6.



Once you have your tools ready, you'll need to open the bonnet, and disconnect the negative battery terminal.


Then, you'll need to remove a few sensors.
First remove the IAC (Idle Air Control) Valve and the TPS (Throttle Position Sensor).

Then the MAF (Mass Airflow) Sensor, and the IAT (Intake Air Temperature) Sensor


After that, you'll need to remove the air intake ducting. Loosen the two hose clamps as shown, and then remove the ducting.




Now remove the three 10mm nuts on the side of the throttle body, where the accelerator cable is, as shown.


Then, remove the two 13mm nuts shown in the picture.


And remove the bracket.


Once thats done, you'll need to remove the two hoses connected to the throttle body. The first you'll need to loosen the hose clamp, and the other will pull off.



Now, you can remove the throttle body.

You'll now need to disconnect the accelerator and cruise control cables. The accelerator just pops out (Left), and the cruise control needs to slide out (Right).


That's it!
Now, depending on whether your throttle body came with it's own sensor and valve or not, you may need to swap them over. To do so, just remove the two screws on the IAC Valve.


Then remove the two screws on the T.P.S, making sure to not loose the little plastic thing that is underneath.


Make sure you keep this.


Then, just put them onto the new throttle body.

Now, installation is just the reverse.

Make sure that you replace the Gasket as well.


And you tighten the two 13mm bolts to 15-20 NM with a torque wrench.


Once everything is finished, and you've made sure no more tools are in the engine bay, connect the negative battery terminal again, and then start the engine.
Once started, rev the engine to at least 2,000rpm and hold for 20 seconds. This will reset the computer on your car, to take advantage of the new throttle body.
If everything went well, it's time to take your car for a spin.
I didn't notice any power gains, but the throttle was a lot more responsive.