Thanks to the weather (Thats what Im blaming it on) I have a coolant leak now.

Its been in the low teens in North Texas and today on a sunny day I took the car out for a spin and I could smell coolant.

At first I thought it was line going into the intercoolers, dead wrong, Its a rubber hose to the right of the ECT sensor the rubber line has a pinhole and the whole line is swollen, not sure if thats the dreaded under the blower hose, but as soon as the car cools down enough for me start taking stuff apart I will know more.

May be able to cut and replce just that section of hose but we shall see.

Wish me luck.

 

Good luck. Whew! I hope that's the last of that..I'm ready for 100+ again...single-digits is too cold for NTX....

 

I was watching the weather channel and we are suppose to get round 3 late this week, we shall see.

 

Ok looks like it's the hose going or coming from the throttle body

I'm going to napa inthe morning to get a union and 3" of hose and that should fix it.

 

On second thought I think both of the lines go to the TB as the prewarming circuit for emissions,

I wonder if I should just eliminate that circuit all together.
Im not required to have emissions testing and I dont think it will make that big of a difference. emissions wise.

 

Good Luck on that Amigo! Take a pic after the install of the new hose/s; atleast you wont have to remove the SC

 

looks like yes, I can eliminate the throttle body warming circuit, which I will be doing tommorow, eliminating the under the blower hose rupture. since the lower hose will not be doing anything.

Im going to blow all the coolant from the line once the in/out from the coolant looped. So that there is no danger of the stagnant coolant causing damage to the throttle body.

 

Is that all it's used for? Warming the TB?
It's not for cooling the TB? Or anything else in the circuit?

 

As far as I can recall pumping coolant through the throttle body brings the throttle body up to operating temps faster and lowers emissions.

 

OMG. It doesn't seem worth it!
I guessed it must be to remove heat and so it would be essential.

Er.... why would warming the TB reduce emissions?

 

I'd believe it....that Rube Golberg collection of plumbing hanging on the 10 o'clock of my AJ16 is just to pump oxygen into the cats on cold starts to heat them up quicker...all in the name of the god of emissions. Well....that and its seemingly primary function of lighting the CEL every other month....

 

Traditionally, when petrol is atomized, either by a carburetor or an injector into a fast air stream, cooling of the mixture has to happen. It's just physics. Under very heavy fuel flow even icing can happen. The heated manifolds, heated throttle body, or exhaust gas derived 'hot-spots' under the butterfly valve seek to replace the "lost heat". Exactly the opposite happens when you compress air by a turbocharger/supercharger -- hence the need to have an intercooler which gets you a few extra horses.
Atomizing petrol fuel does not turn it into a proper gas, its just a cloud of droplets. Replacing the lost heat makes the droplet size smaller and therefore subsequent combustion after compression is more efficient -- i.e. more power or more fuel-efficient.
If you're running on propane/butane as with LPG, it's ALWAYS a proper gas as soon as it comes out of the vaporizer. The vaporizer is the device which replaces the lost heat, using spare heat from the coolant. If the coolant is cold, cases have been known where the LPG pressure is too low to operate the engine properly, and the vaporizer is covered in frost.
Leedsman.

 

Ah, thanks!
What's odd, though, is that quite a few people say they want to avoid heat soak into the air intake as it causes lower power. Wouldn't they want to disconnect the TB cooling?
I've never seen that put forward.

 

It took some work, but the circuit has been eliminated this am, took it out for a spin and all seems normal, I guess time will tell when it gets cold again here in texas the negative impacts, in the mean time monday I will order a new hose, just as a precaution

 

I'm not exactly sure of the purpose either, but I did the same thing on my Rangie, since it is a leak prone area. I had read that it aided in cold starts or something like that if it was very cold. Dunno, but the Rangie starts up fine in the cold without it. Passes emissions too.

 

well the dread hose under the blower the TB return hose, I shouldnt have a problem with that hose, if its not being used.

 

I'm having trouble visualizing how this is going to work?

It was my understanding that the hose under the supercharger which is failure prone was part of the intercooling circuit?

Is that incorrect?

Is it really a throttle body warming circuit?

Bob S.

 

Looking at the diagram (from GTR, now TOPIx), it looks like there's a (smallish bore) hose from a T off the engine coolant outlet. That hose goes to the EGR valve, then the TB, then the water pump, then back into the engine. (The water pump also gets coolant from the main radiator-via-thermostat hoses, and that's the main input to the water pump by the look of it.)

Oh. Closing off the hose for the TB should prevent warming/cooling of the EGR valve. Good? bad?

There's a separate SC pump taking coolant to the charge air coolers and back round through the SC radiator.

 

sat in traffic at a stop for 30 min, and car is running great, nothing noticably different.

 

I think Leedsman came the closest. Throttle icing is nothing to mess with, I don't think. I wouldn't defeat my throttle body heating, even if I did live in Texas.

The attached is sort of dry reading, but it explains the phenomenon really well.

Cheers,