Throttle Body Cleaning
It's a good idea to clean up the throttle body every so often,
as the oil vapor in the PCV system condenses on the cooler walls
of the intake. This leaves a nice oily scum, which could potentially
cause problem with the throttle butterfly valve.
1) Remove the air filter & AFM. See the intake
page for assistance.
2) Remove the Throttle Body by removing the below circled hoses, bolts,
etc. Consult the BGB or Haynes for more details:
a) Green - Remove the VTV and it's hoses, take note
of which way the VTV is situated, black side to the rear of the car
b) Red - Air hose and clamp
c) Yellow - 4 coolant hoses
d) Orange - There's 2 coolant hoses w/ clamps here behind
the VTV. Both are full of coolant, so be sure to be ready for some spillage
as you remove them.
e) Purple - Remove the throttle spring and the adjustment
rod. The rod is removed by just prying and spinning it out.
f) Blue - Now you can remove the two 12mm nuts and two
12mm bolts that hold the throttle body in place. There's also a 12mm
bolt that connects the yellow-circled hoses to the TB, which you cannot
see in this pic. You will need to remove it too.
3) Here's the the intake with the TB removed. You can see the oily residue.
Clean up inside as far as you can reach, but don't drop anything down in
4) Just some pics of the TB cleaned up. It will be just as dirty as the
intake. So, take some carb cleaner to it and clean it up nicely. But! before
you do this remove the TPS, as getting brake cleaner on it will likely damage
it. Just remove the 2 screws and pull it out. You will need to readjust
it when putting it back on the car. Also, make sure to clean up the old
gasket on the TB and the intake manifold with a razor blade, making sure
not to scratch or gouge the surfaces.
Just a pic of the TPS removed:
5) When replacing the TPS it's a good idea to replace the screws with some
allen wrench type bolts. This way the TPS is easier to get to to adjust
while the TB is on the car. The name/size of the bolts to get from your
local Lowes/Home Depot is "4mm x 12mm cap screw socket". I also
used two 4mm washers.
5) Now you need to adjust the TPS. For help with that, go here.
6) Installation of the TB is opposite of removal. Use some Permatex RTV
for the gasket between the TB and intake manifold, or purchase a new gasket
from Toyota. Also, make sure to burp the coolant system once you get everything
back together. You also may need to adjust the idle speed screw that is
on the TB.