QUOTE(mgp4591 @ Feb 24 2015, 12:52 AM)
QUOTE(914GTSTI @ Feb 23 2015, 09:35 PM)
Could the water at the TB be for anti-icing and then maybe emissions ?
From what I've seen it's mainly for emissions- it helps the tb heat up with the rest of the engine and keeps the fuel delivery balanced with engine warm up. That's why when they go bad you'll hear the rpms rise then drop, rise then drop over and over. The tb doesn't know that the engine is warmed up to operating temp until the O2 sensor tells it it's getting too much fuel. The newer engines may have more controls that make the older systems antiquated but I'm not bypassing my tb on my EG33...
It is emission related but only for this reason. When the engine is cold it produces lots of water vapor, that conduces again in cold areas. Since you have a PVC system on these engines that systems vapors gets re-interduced back into the intake track. This contains the same mix of crap that condenses elsewhere. And since it is going through a Venturi it will tend to cool the vapors and they can form crystals that can potentially freeze up the TB. That is the emission side of this equation.
The other side is if you live in cold climates the same effect can cause icing in the same way.
BTW, the TB is not a smart device, it might house a sensor or two, like TPS, and maybe an intake temp sensor, but beyond that it does noting. It has one function, help you maintain control of the engine. Gas engines control the entry of air into the engine, it is one of the three requirements for ignition process. Modren Diesel engines don't even have a TB, its all done via fuel. Some do have an a shutdown plate that blocks the intake track. This is because they can run on, off oil introduced into the intake. Newer TB units also have a stepper for drive-by-wire systems. Solves the packaging issue of a cable connected your TB. That is also there to help control the engine, but it allows the engineer to manipulate the system also easier, so things like traction control become much easier when the computer can control all inputs and out put functions. IT is a wonderful thing, and can be used for much good in our world. Emissions, fuel economy, stability and traction control, and the list goes on one on...
All good things, for the average driver. With out this stuff, would anybody in the general public be able to drive a Dodge Hellcat off the dealer lot.
So since I share the road with these lack of control "great drivers" I'm glad theirs and engineer on the other side keeping them close to being in control.
The hunting your explaining is a leak, and can come from the TB shaft, most likely from another source though. TB shafts can't be ruled out though. Replacing the TB, means you have replaced other items, or secured them and maybe solved the leak.
Hope that cleared some stuff up, and then made it about clear as mud.