Here is the way how to cleaning the throttle body of your car.
Please prepare the following before attempting to start this DIY:
1. New Throttle Body gasket.
2. Carburator Cleaner.
3. Rags
4. Spanar Size-10
5. Flat Nose Plier
6. Long Nose Plier
7. Phillip/Star Screw Driver (Optional)
A. Disconnect the 12Vdc:
Plug off ONLY the NEGATIVE Terminal on the battery. Make sure this terminal will not have any contact with the NEGATIVE Battery Terminal while ur doing ur work, with or without intention.
DO NOT attemp to proceed to the next step if u fail to do this step.
B. Removing the Air Ram:To do so, u will need spanar Size-10 or Phillip/Star Screw Driver to un-tighten the clip at both ends of the Air Ram.
C. Removing the Throttle Body:
Once Step-A was done, u’ll see the Throttle Body as described below:
We’ll start by removing the throttle cable:
Follow the instruction given on which way to pull in order to loosen the clips. This was described as “D”.
2. Done with the Throttle Cable and we’ll continue by un-plugging the connection socket for
both ISCV and TPS Sensors. Both these sensors are described as “B”. U might need to use
long nose plier to pull off the safety clip attached to the socket before attempting to un-plug
it off.
3. Proceed by pulling off the vacuum hose connecting camshaft cover non-PCV output to
the throttle body’s inlet just before the butterfly. This was described as “C”.
4. The next step would be to unscrew the throttle body’s mounting off the 2-bolts and 2-
nuts using a size-10 spanar. This was described as “A”.
5. Now the throttle body can be lifted up, but it is still attach with the coolant hoses. Plug
off the coolant hose thats attached with the throttle body with a flat nose plier. Dont be panic when coolant flowing out while this hose was unplugged, its just a minor volume and topping-up the coolant after this process will not be neccessary.
No picture was shown for this step as the coolant entering throttle body of mine had already
been by-passed since day-1.
Done with the last step and the throttle body is ready to be taken out.
D. Cleaning the Throttle Body:
This is what u’ll see at the upper end of the Inlet Manifold:
shown in the picture was the location of the MAP Sensor...just for knowledge sake.
On the throttle body itself, look at how dirty it is on both sides:
Also shown in the picture are The Do’s and The Dont’s.
To clean the TB, use ONLY Carb-Cleaner (or TB's Cleaner if u could find one). But
definitely NOT WD40!!!
Spray the Carb-Cleaner onto the inner surface of the TB, before and after the butterfly/flipper. Once most of the oil were almost removed, use clean piece of rag to wipe dry the inner part of the TB. There is a hole whc looks almost like by-passing the butterfly, this is meant for the ISCV. Spray and soak it with Carb-Cleaner few times until its clean. This is part of the solution to most of the idling problem.
Very important...DO NOT adjust the TPS screw, the one which was marked with paint. U dont need to directly spray the Carb-Cleaner onto the TPS as well.
This is how it looks after the cleaning:
Top View:
Bottom View:
E. Reinstall the Throttle Body:
Once everything had been cleaned, put it back as how you dismantled it earlier. It is advisable to change the Throttle Body’s gasket to a new set.
Revision of what had been unplugged earlier that should be plugged-on this time:
1. New gasket.
2. Coolant hose on the Throttle Body.
3. 2-bolts & 2-nuts size-10.
4. TPS & ISCV Socket.
5. Throttle Cable.
6. Air ram.
7. Re-connecting the NEGATIVE Battery terminal.
Before u put back the TB, juz look down on the inlet manifold...few inches after the Throttle Body, thats the MAP Sensor. You can clean its surface with clean tissue if u want, but to pull it out can be a little bit tough as there is a rubber O-ring attached onto it.
Here's how a MAP Sensor looks like:
Here’s another picture comparing the BEFORE & AFTER cleaning the Matched Port on the Inlet Manifold:
How often should this be done?
advise at every 20,000km average...
Hope this post can give you some info.
