ID this sensor please!
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
ID this sensor please!
'94 4.0L, was attached to the back of my air filter box. I thought it was the IAT (intake air temp) sensor...but it seems to be a vacuum tube inside. Do I need to find a place for it on my new intake? If so...do I need to relocate the thing inside the box that it was attached to as well?
http://i112.photobucket.com/albums/n...ensorSmall.jpg
Thanks.
http://i112.photobucket.com/albums/n...ensorSmall.jpg
Thanks.
Elder User
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What you are holding in your hand is a vacuum line.. possibly for a heater control valve, EGR solenoid, or maybe it connects to another line that goes inside the vehicle for heater door operation.
Immediately to the left of your hand is the blower motor resistor.
Immediately to the left of your hand is the blower motor resistor.
Senior User
Joined: Dec 2005
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From: Beaver, Pennsylvania
If my guess is right -- that vacuum line goes to the top of the air box with another beside it. The other hose should go to the butterfly valve in the air intake under the alt.
When your engine is warming up that valve deverts the warm air from around your p/s exhaust manifold to your air box. after warm up it will open and pull air from grill area.
Its an emission thing! In some states it has to be there, In others it's not imprtant.
When your engine is warming up that valve deverts the warm air from around your p/s exhaust manifold to your air box. after warm up it will open and pull air from grill area.
Its an emission thing! In some states it has to be there, In others it's not imprtant.
Post Fiend
Joined: Feb 2003
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From: Eastern WA
Actually, the system operated by that vac line is a bit more than an emission thing. It keeps ice from forming around the butterfly valve in the TB and thus your throttle from sticking under certain weather and driving conditions.
Senior User
Joined: Dec 2005
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From: Beaver, Pennsylvania
Good point! The reason I thought emission oriented is that in my state they make sure every vacuum line is hooked up & hooked to where it's supposed to be.
Never thought about the Ice in the throttle body.
Never thought about the Ice in the throttle body.
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
It wasn't the vacuum line to the anti-ice valve on the intake...I have that one, this one goes to a "T" near the A/C evaporator.
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Postmaster
Joined: Jan 2003
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From: Durham, NC
Originally Posted by RangerPilot
...I have that one, this one goes to a "T" near the A/C evaporator.
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
Originally Posted by Bob Ayers
The A/C evaporator is in the airbox on the firewall with the heater core......
Here's a picture from further out. You can see the sensor, on the left side of the pic, and the "T" in the approximate center.
http://i112.photobucket.com/albums/n...nsorsmall1.jpg
Post Fiend
Joined: Feb 2003
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From: Eastern WA
The item behind your hot-air intake/filter and near the blower motor is not a sensor, it's a vac line connector that should be connected to the sensor that was mounted on the lid of the original cold air intake.
Postmaster
Joined: Jan 2003
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From: Durham, NC
Zach, you would be better off with the OEM airbox, and connect everything back up. With that conical air filter, you are pulling in hot air from the engine compartment, which isn't good!! Sorry you wasted your money!!!
Post Fiend
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What intake did you get,I didn't know anyone made one for a 94. A good quality intake for the proper year should have all the corect hookup's on it with detailed instructions. Also a good intake should have an airdam that as a rubber seal, when the hood is closed it should seal to the bottom of the hood to help keep out some of the hot air. I couldn't get the pitures up to see, I'll try again.
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
I made it myself...kinda got bored in shop. It does have an air dam Wendell, the install wasn't close to complete when I took the picture. I'm finalizing it a little bit (lots of little things the dam had to go around), but it should be done soon. Then I've just got to run the ram air, which is going from the passenger side behind the bumper up...I'll get some pics up once I'm done.
And still...nobody has said what the sensor it connects to does. It's running fine with the line capped and the sensor in the stock airbox in the shop...so I'm not too worried about it.
And still...nobody has said what the sensor it connects to does. It's running fine with the line capped and the sensor in the stock airbox in the shop...so I'm not too worried about it.
Post Fiend
Joined: Feb 2003
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From: Eastern WA
I just don't understand how, after all this, it's still unclear 
. The item you keep asking about is a plug on a vac line that engages with a temp sensor that regulates vac supply to the damper operated by a vac motor for your heat riser. This is (was) part of your former cold air intake which apparently has been replaced with a warm air intake. Heat riser operation and components are explained in the Ford or Alldata service CD that you mentioned awhile back that you have; I'm looking at one right now (on CD) for an old 94 Ranger 4.0. Have you looked in yours? Also, there should be a vac routing diagram on your core support; manufacturers do this during new vehicle assembly. Do you have one? Such info might be of interest. I left out details on the heat riser operation, such as why ice will form at the butterfly valve when in fact intake air temperature is above 32 degrees F because didn't want to further confuse you. Hopefully, knock on wood, this is all explained and understood.
. The item you keep asking about is a plug on a vac line that engages with a temp sensor that regulates vac supply to the damper operated by a vac motor for your heat riser. This is (was) part of your former cold air intake which apparently has been replaced with a warm air intake. Heat riser operation and components are explained in the Ford or Alldata service CD that you mentioned awhile back that you have; I'm looking at one right now (on CD) for an old 94 Ranger 4.0. Have you looked in yours? Also, there should be a vac routing diagram on your core support; manufacturers do this during new vehicle assembly. Do you have one? Such info might be of interest. I left out details on the heat riser operation, such as why ice will form at the butterfly valve when in fact intake air temperature is above 32 degrees F because didn't want to further confuse you. Hopefully, knock on wood, this is all explained and understood.
Last edited by CowboyBilly9Mile; Jan 29, 2007 at 01:28 PM.