What is this thing?
Senior User
Joined: Dec 2004
Posts: 233
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From: centeral Ohio
it's your coolant temp sensor sorta thingy. It does work with your egr somehow i've been told.
I hooked up my new water temp gauge in it's place and had no problems so it probably isn't a big deal.
I hooked up my new water temp gauge in it's place and had no problems so it probably isn't a big deal.
Senior User
Joined: Oct 2003
Posts: 215
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From: Central Coast, CA
It's a TVS or Thermal Vacuum Switch. When the coolant temp rises enough, it allows the vacuum to "carry through" the valve. Your EGR doesn't open up untill the engine warms up. This is how it senses the engine is up to temp. It should hold vacuum when cold and not when hot.
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From: Virginia Beach
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Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
They've done away with that on the FI trucks. My ECT just has the wiring harness on it, no vacuum line. Interesting.
I also like the Ford blue painted accessory bracket.
I also like the Ford blue painted accessory bracket.
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Junior User
Joined: Jun 2004
Posts: 64
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From: South Jersey
There should be another hose connected to another port on that TVS. The hose would go to a vacuum port at the base of the carb that provides vacuum only at partial throttle or decel. If you do hook it up make sure you don't use direct manifold vacuum or you will have stalling problems when the TVS opens after the engine reaches operating tempurature. The plastic the vaves were made from was very brittle and most of the time the nipples got broken off so you may not see the additional one on there just a hole where it used to be.
Any one that has TVSs on there vehicles should check them if they have drivability problems. They go bad quite often and especially if the engine was overheated. I used to change them when ever someone came in with a stuck thermo or overheating problem.
BTW TVSs were used before computer controls and solinoid activated EGR valves and such.
(I'm an oldtimer)
Any one that has TVSs on there vehicles should check them if they have drivability problems. They go bad quite often and especially if the engine was overheated. I used to change them when ever someone came in with a stuck thermo or overheating problem.
BTW TVSs were used before computer controls and solinoid activated EGR valves and such.
(I'm an oldtimer)
Last edited by Phantom; Jul 20, 2005 at 07:48 PM.
Postmaster
Joined: Feb 2003
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From: Spokane WA
Originally Posted by GeneStoner
Besides the EGR, what else would need such a vacuum signal?
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Posting Guru
Joined: Aug 2002
Posts: 1,493
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From: Great NW
Good info.
I just went down to the local NAPA store and found out those suckers are expensive! ($45.00 yeouch!).
I was going to just replace the thing while I had my t-stat housing off for good measure, but at that price, I'll just wait until it goes bad.
I just went down to the local NAPA store and found out those suckers are expensive! ($45.00 yeouch!).
I was going to just replace the thing while I had my t-stat housing off for good measure, but at that price, I'll just wait until it goes bad.
Junior User
Joined: Jun 2004
Posts: 64
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From: South Jersey
Originally Posted by oldhalftons
Some will switch the vacuum advance signal from ported to manifold vacuum at around 210 degrees. the timing is advanced and the idle goes up (and spins the water pump faster).
Back when I was a tech they were $8-$12 list... prices have definately gone up!
You may want to try a dealer for price, sometimes on odd things like this they are actually cheaper! I remember when 9004 bulbs first came out, parts houses were getting between $10 and $15 for them and my local Ford dealer had them for $4.99!
Last edited by Phantom; Jul 21, 2005 at 07:56 PM.
Junior User
Joined: Sep 2003
Posts: 65
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Originally Posted by GeneStoner
What is this item seen here on the middle? The vacuum line goes to the EGR but it is connected to the H2O neck...
I don't get it.
I don't get it.
I know this thread is old, but why is my connection to that middle senor wires and not a hose like this one on my 94 300 six?
Also my tube is very rusted so it that thing a one piece setup from the hose clamp to the threaded end when you buy it and what is it called?
