This writeup is for you guys who need to replace your throttle body on your 4g63 motor. I performed this with my personal experience on my 2g 96 Eclipse GSX.
Parts needed:
New Throttle Body (Be sure it has new BISS Screw & O-ring/Shaft seals/Gaskets
IAC from present Throttle Body
TPS from present Throttle Body
Tools Needed:
12mm socket and ratchet 3/8 drive
10mm socket
8mm wrench
3/8 drive 3" extension
2 pairs of Vice-grips
Flathead Screwdriver
Phillips head Screwdriver
Pliers
Multimeter or Ohmmeter
Factory layout of 4g63 zoomed in on throttle body:
Step 1: Removing Throttle Body
First thing you need to do is remove the factory rubber IC pipe from the throttle body elbow. This is held on by a regular screw type clamp. Use a flathead screwdriver to loosen the clamp and remove the pipe from the throttle body elbow.
There are 2 bolts and 2 washers/nuts that hold the throttle body elbow onto the throttle body itself. The nut/bolt heads are 12mm. Remove these nuts and bolts and now you will be able to take the TB elbow off.
Next you remove the gasket between the TB elbow and the TB itself. Get a new one if possible. Take the IAC connector off by pressing the top of the connector and pulling it off the IAC. Remove the TPS connector by just pulling it off. Remove the 3 vacuum lines on the top of the TB as well. The throttle cable needs to be removed from the back of the TB as well.
Now with all that off, we need to unmount the cruise control box from the firewall to get it out of the way so that we can remove the throttle body from the intake manifold.
There are 3 bolts that have 10mm heads. Remove these 3 bolts and the cruise control box can now be semi-mobile. Be sure not to make the throttle cables loose.
Now with the cruise control box out of the way, we can now remove the throttle body from the intake manifold. Do this. There is a gasket in between the TB and the intake manifold. Replace this if possible. You will now see that the only thing keeping the throttle body in the engine compartment are two coolant lines that go on the bottom of the throttle body.
Use a pair of pliers to slide the clamps down. I used a set of vice-grip pliers to clamp the hose to hold the coolant back down and to not make such a mess. After doing this, you can now remove the throttle body from the engine compartment.
Step 2: Installing IAC and TPS on New Throttle Body
Now with the old throttle body out of the engine compartment, we need to take the IAC and TPS sensors off to put on the new TB. Each sensor can be taken off with a phillip's head screwdriver. I advise using a 8mm open end wrench to break the screws off as they may be too tight for a phillip's head screwdriver to break. Take both the sensors off the old throttle body.
The IAC is very simple to put back on. The new throttle body should've come with a new IAC O-ring. That sits right where the IAC will go. With the O-ring in place, install the IAC by using the same 2 screws that were used on the old throttle body.
The TPS is a little more complex than installing the IAC onto the throttle body. I advise using the haynes manual if you have one to help you on this step. If you put the TPS onto the TB, you can turn it and it will spring back. Make sure it does that and then screw the TPS onto the throttle body with the screw holes in the center of the TB holes where the screw head will sit on. You can check resistance with an ohmmeter or multimeter between terminals 1 and 3 with the butterfly at WOT and fully closed. The resistance on my TPS went between 200 ohms and 4710 ohms. This is normal. You can now put the TB back into the engine compartment and install the coolant lines. Installation is reverse of removal.
Step 3: Installing New Throttle Body on Car
Slide the throttle body back onto the intake manifold studs. You can now mount the cruise control box back onto the firewall. You may now put the IAC connector back on the IAC now along with the 3 vacuum lines on top of the TB.
You also can now install the throttle cable back onto the back side of the throttle body along with the TPS connector back onto the TPS.
Put a new gasket back onto the throttle body and install the TB elbow back on with the 2 bolts and 2 nuts/washers. Slide the intercooler pipe back on the TB elbow and clamp the pipe back down with the screw-type clamp. Start the car up and check for vacuum leaks. Adjust the BISS screw as needed with a phillip's head screwdriver to adjust idle. Take the car for a drive to see if it does anything funny. If and when you get back and everything's fine, you're done!
Now that you are done, enjoy your new Throttle Body! :)
Copyright Jack Stewart Writeups Inc. 2008
Linear Mode
