How To Bypass Throttle Body Coolant Housing

[bmwguy325is]

.....Throttle body heat supplied by that coolant loop ensures there is never a risk of throttle icing.....

I would honestly love to see a car succumb to carb icing.
If you would like specifics when the outside air temp is between 80-25 deg F AND difference between the Dew point and the OAT is less than 20 deg.
Those are the conditions for carb ice.
So what are the dangers?
Now if the BMW had a carb Id be more worried. Fuel atomization with the drop in pressure makes for a great place for ice to form. Seeing how just air goes through the throttle plate its not as dramatic.
Now as the engine heats up so does all the metal attached to it. So thus the throttle body warms up as well.
As noted above in a post it helps the car run better when cold.
Oh and what if your throttle body ice of darn the engine quits and it wouod most likely be at cruise....... Pull over melt ice move on.

[JinormusJ]

Okay, I'm axing. I'm curious. How is it worse to replace the gasket?

Have you replaced one of these before?
I bought the gasket, and a new U-cap, and after putting it all together, it still leaked: NEW PARTS. This stupid little heater was keeping my car off the road for the better part of 2 weeks. Trust me, I'm OCD when it comes to small little details like this, and I tried everything I possibly could to keep the heater; if I could have, I would have. Granted not everyone will have such a horror story, there just isn't as much benefit To fixing it if it's such a headache. If you can manage to replace the gasket and it fixes the problem, by all means go for it. If not, this solution is for the other guys.

[StereoInstaller1]

I drove my car for about 20,000 miles with this hack in place, then I fixed it.

It ran much better fixed, especially in the winter. The gasket was only a couple bucks, but I replaced the hoses too, that was a few bucks more.

[5Toes]

Okay, I'm axing. I'm curious. How is it worse to replace the gasket?

5Toes says the 3/8" brass hose splice cost $2.52.

BavAuto sells the required gasket for $1.95.

plus atleast $3 shipping ;)

[nando]

See post #14 above.

At partial or small throttle openings there is a significant pressure drop from ambient atmospheric pressure down to manifold vacuum after the throttle plate. That pressure drop produces a corresponding significant temperature drop.

It is a misconception to think that throttle icing is only a risk in extremely cold climates. The risk is actually smaller in cold climates due to less humidity carried in the air.

The risk is highest in high humidity climates while operating at or above near freezing temps, if the resulting intake pressure drop causes below freezing temps on the other side of the throttle plate. The humidity that condenses out of the air will freeze to the throttle body and throttle plate, potentially jamming the throttle open, or ultimately choking off airflow altogether.

Throttle body heat supplied by that coolant loop ensures there is never a risk of throttle icing.

if yours is leaking it's not difficult to bypass the Throttle Body Coolant Housing as described above But it's equally not difficult to simply replace the leaky gasket.

too bad your wisdom will fall on deaf ears. the kids will continue to do pointless mods because racecar!!!!!1 I've pointed this out many times but it doesn't matter. they'll delete the TB heater "for better air cooling" then run a half crushed, completely filthy open "cold air intake" that sucks it's air right off the back of the radiator.

[Ferdinand]

If yours is leaking it's not difficult to bypass the Throttle Body Coolant Housing as described above. But it's equally not difficult to simply replace the leaky gasket.

False. It's worse

#AxemehowIknow

Okay, I'm axing. I'm curious. How is it worse to replace the gasket?

5Toes says the 3/8" brass hose splice cost $2.52.

BavAuto sells the required gasket for $1.95.

[travish325]

so glad i just found this. my shit is leaking like a mother right now.

sounds like a personal problem to me.


ewwwwww

[JinormusJ]

If yours is leaking it's not difficult to bypass the Throttle Body Coolant Housing as described above But it's equally not difficult to simply replace the leaky gasket.

False. It's worse

#AxemehowIknow

[Ferdinand]

I'm sorry, pardon my ignorance, but is there any consequences for doing this?

See post #14 above.

At partial or small throttle openings there is a significant pressure drop from ambient atmospheric pressure down to manifold vacuum after the throttle plate. That pressure drop produces a corresponding significant temperature drop.

It is a misconception to think that throttle icing is only a risk in extremely cold climates. The risk is actually smaller in cold climates due to less humidity carried in the air.

The risk is highest in high humidity climates while operating at or above near freezing temps, if the resulting intake pressure drop causes below freezing temps on the other side of the throttle plate. The humidity that condenses out of the air will freeze to the throttle body and throttle plate, potentially jamming the throttle open, or ultimately choking off airflow altogether.

Throttle body heat supplied by that coolant loop ensures there is never a risk of throttle icing.

if yours is leaking it's not difficult to bypass the Throttle Body Coolant Housing as described above But it's equally not difficult to simply replace the leaky gasket.

[5Toes]

If you live in an extremely cold climate, sure.

For you in cali.. none at all.

[paperclip]

I'm sorry, pardon my ingnerance, but is there any consequences for doing this?

[DooDanE30]

so glad i just found this. my shit is leaking like a mother right now.

[TheArtofEuros]

great write up. my IX just started leaking from the gasket. will this fix be ok in south jersey? we get all the seasons and I'm just wondering if it'd be ok to do this fix. thanks in advance!

[cobraken]

I welded the fitting on the back of the block closed and JB welded the thermostat housing. It will never leak again for me!!

[B&C]

I realize you're kidding, but just in case others don't get it...

The throttle body coolant housing has pretty much zero effect on the temperature of the air coming through the intake system of the engine. Its purpose is to heat the metal of the throttle body housing itself.

Other than that, the need for a working throttle body heater is more dependent on humidity levels than ambient air temperature. Cold parts of the world actually have less need for the heater, as frigid air carries less humidity.

Throttle body icing occurs because of the sudden pressure drop from ambient atmospheric pressure down to manifold vacuum as the air flows past the throttle butterfly plate. The effect is most noticeable at long-time part throttle openings, like steady cruising on the highway (not wide open throttle).

A sudden pressure drop produces a corresponding temperature drop. The drop in temperature reduces the air's ability to hold moisture, so water condenses out as the air passes the throttle plate. If the pressure/temperature drop is sufficient, ice will build up on the cold metal surface of the throttle body and throttle plate.

Well stated.

Under some conditions throttle plate icing can be a dangerous problem.