IAC and Throttle Body cleaning FAQ

**Kirk** · 12-29-2007, 01:57 AM

By: TurboMatt on www.supraforums.com

IAC - if your car has a sporadic idle this might be the fix for you

The IAC is located at the rear of the intake on the valve cover side of the intake. You must remove the two 12mm bolts, harness plug, large 3/4" feed hose and two smaller coolant lines

Two coolant lines to remove.

IAC off the car - sorry for the color, camera freaked out

This check valve is what's inside the intake. Remove it and the rubber/plastic grommet after you remove the IAC from the manifold.

After cleaning the valve with the CRC air intake cleaner and the PLASTIC brush. Make sure you don't use a metal brush or you could damage the orange gasket.

After shots of the IAC nipple (?). This was gunked up but I forgot to snap before shots.

After shots of the other half of the IAC. This section is what bolts to the actual intake. Forgot to snap before shots as well.

After everything is cleaned and re-assembled you will need to reinstall the check-valve. This is how it is installed in the intake manifold.

Don't forgot to hook up these two hose BEFORE you bolt the IAC to the intake.

That's it! Now on to the throttle body removal and cleaning.

**Kirk** · 12-29-2007, 01:58 AM

Now onto the throttle body cleaning.

Make sure you unhook and remove the battery. This will make it a lot easier to get to the hoses on the bottom of the throttle body.

The first thing I did was to remove the throttle and cruise cables. This is done buy pulling the throttle blade into the WOT position then pull the slack up on the cable and slid the end out. Also, make sure you disconnect all of the electrical connections to the TC motor, TPS, etc.

Remove this hose on the drivers side of the intake manifold.

Remove these three hoses located on the bottom of the throttle body.

Now unbolt the two 12mm bolts on the top of the throttle body and remove the two 12mm nuts from the lower studs. Here is a shot of the drivers side stud. I used a 6" extension to reach in with a 12mm socket.

All shots of the throttle body after I removed it. Pretty eh?

I sprayed the throttle blade with the CRC air intake cleaner and let it sit for ~30 seconds then worked it with the brass brush. I repeated this 5-6 times and this is the final product.

Re-assembly is pretty easy. I hooked up the 3 lower lines before sliding the throttle body onto the studs. It's much easier to have those lines hooked up first.

A little trick to get the lower nuts on. Put a dab of bearing grease in the socket then place the nut in the socket. This works great when you need to get a nut on in tight places as with this.

As soon as I started the car the idle didn't start at 300-400 like it usually did. The idle was high (1200ish) for 10 minutes or so. After driving the car the idle settled at the first stop light I came do (~700). You'll notice that throttle response should be a bit more crisp with a clean throttle body as well!