[mtts60]

Recently I decided to do the 3M intake cleaning, of which step 2 required removal of the throttle body to spray the cleaner on the back side of the throttle plate.

I was quite surprised to find coolant hoses attached. Not ready for this, some leaked on to the floor.

Here's what needs to happen in order to remove the throttle body:

1. Remove the large hose that goes from the airbox to the throttle body
2. Clamp, then remove the two coolant hoses.
3. Pull the other hose off
4. Unplug the electrical connector
5. Remove the bolt holding a short metal bracket (on the front)
6. Remove the two bolts and two nuts holding the throttle body to the intake manifold.

When everything is cleaned & reassembled, do the idle re-learn procedure.

 

[bobbo]

I've never seen that 3M kit, but good on you mate - I remember being surprised by the amount of coolant too when I did the coolant bypass during a TB swap.

 

[mtts60]

I was surprised to see any coolant there. I'm still not sure why they'd run coolant to the TB. Maybe to keep the gear train warm and therefore free of ice?

 

[Amar]

maybe to cool it when it gets hot in the summer?

 

[t-rd]

There has always been coolant line running through the throttle body on Honda's.

 

[jfuredy]

Yes, the coolant lines to the throttle body are there for de-icing. At idle, there is a pretty good pressure drop across the closed throttle body, which causes a pressure drop. A sudden drop in pressure also causes a drop in temperature. Just like when you use a CO2 cartridge for BBs, or a can of air cleaner to blow the dust out of your keyboard. If the ambient air temperature is fairly low, and the humidity is fairly high, this can cause icing of the throttle body, causing it to stick closed.

I live in Phoenix, AZ and I have been thinking about bypassing/jumping these lines to keep the intake cooler. In this climate I don't normally have to worry about low temps OR high humidity.

 

[mtts60]

All good info. I'm 6 months in to owning my first Honda, so that "coolant in the throttle body" thing was new to me.

One thing about doing the entire 3M intake cleaning and/or idle re-learning: it got rid of the problems with launching the car smoothly from a standing stop. It would act as if I briefly mashed the accelerator when I didn't. I'm not sure which one fixed it since they were both done on the same day, but it doesn't matter. It's fixed and it only cost $25 and an hour's time.

 

[mtts60]

I live in Phoenix, AZ and I have been thinking about bypassing/jumping these lines to keep the intake cooler. In this climate I don't normally have to worry about low temps OR high humidity.

In PHX, yeah I guess you don't need it.

Having coolant in the throttle body kinda defeats the purpose of cold-air intakes that people waste (oops, I meant spend) money on, doesn't it? :wink

 

[t-rd]

That's why some people do the coolant bypass and do a loop instead, but if you forget to place it back during winter then you'll be in trouble.

 

[speedkar9]

Just to update this thread with my little DIY,

I cleaned my throttle body, idle air control valve and PCV valve. Car runs a bit smoother in drive.

Here's a video on how I did it:

https://www.youtube.com/watch?v=cwo1Hs_0aSI



I did have to remove the throttle body to get to the IACV screws. They didn't want to come out with a screwdriver so I gripped it with locking pliers and got them to break free.