I am having problems understanding what the TVV Sensor ( blue top) located near the temp sensor and at the base of the top radiator hose leading into the block does. The plastic fittings on the TVV sensor have been broken off and the hoses are plugged. From the description in the Haynes manual 6-17 it shows the TVV is connected to port P on the intake and also the charcoal canister.

I have to assume that the water temperature opens and closes this vaccum switch, but since it is not functional, does it have an effect on the transmission shifting into 4th gear in cold temperatures below 20 degrees?

The car is 100 miles away I wanted to know if it would be best to keep the vaccum hoses plugged or couple them together? I'm sure the best thing would be to replace the TVV sensor, but not having a garage and temps below freezing, I'm not comfortable opening up the cooling system at this time.

Is it better to keep the hoses plugged or join them together?

Thanks

TVV allows fuel vapor from the fuel tank that is absorbed into the charcoal canister to be burned by the engine. When the engine coolant is above 129 degrees and a valve on the canister is open, the TVV opens and the engine sucks vapor out of the charcoal canister through the TVV and into the intake.

If the hoses you refer to are connected to port P and the canister, then plug them. If they are connected to TVV, then there is no effect either way. Plug port P and the canister line if they are open. Replace the TVV as soon as you can.

TVV has no effect on transmission shifting. The engine coolant temperature sensor would have an affect on transmission shifting.

There is a diagram on the evap control system on page EG1-149 and installation instructions on TVV on page EG1-151 of the '94 Camry manual stickied in the post at the top of this forum. Download here (http://www.camrystuff.com/manuals/Gen3/CamryRepairManual.rar) or reference here (http://www.turboninjas.com/camry/). I suggest you use this manual instead of Haynes.

Brian:
The vaccum hoses are not connected to the TVV sensor. So, I will make sure that the hoses are plugged until I can get a new TVV sensor and replace it.

Thank you for the explanation.

If you play golf, golf tees make good hose plugs.... :)