Unknown Sensor please help
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Joined: Jun 2000
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From: Potsdam, NY, USA
Unknown Sensor please help
Hi, On my 350 TPI there's a sensor that I'm not sure what it is. And it's not hooked up. Anyway, it's on the cylinder head on the passenger side of the car, and is between the #6 and #8 spark plug, same location basically as the temerature gauge sender unit on the opposite cylinder head. The plug on this sensor is the same shape as the one on the knock sensor down by the oil pan. There is nothing plugged into this so I can't trace where it goes or what it does. Please help. Thanks
Joined: Jul 1999
Posts: 10,950
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Its the passenger side fan switch.
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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Joined: Dec 2000
Posts: 1,536
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From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
It's the fan switch! Controls when the fan kicks on and off! W/out that hooked up the fan won't kick on and off unless someone (you or a previous owner) has hooked up a fan switch elsewhere! The passenger side head is a b*tch to get to so I see that happen a lot! The guy/gal that owned my car before me welded a fan switch into a short metal pipe about the same diamater as the upper radiator hose and then cut the upper radiator hose and clamped this pipe between the two pieces!
If you decide to hook up your own fan switch, make sure you use a relay of some sort! I just bought an adjustable fan switch from Autozone for $20 and the adjustable device has a relay built into it already! Really simple to hook up also and it's very ideal if you want to go with a slightly cooler, 180 degree, thermostat!!
If you decide to hook up your own fan switch, make sure you use a relay of some sort! I just bought an adjustable fan switch from Autozone for $20 and the adjustable device has a relay built into it already! Really simple to hook up also and it's very ideal if you want to go with a slightly cooler, 180 degree, thermostat!!
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Joined: Oct 1999
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Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
You could do that or just have the fan come on with ignition 
. That's the cheapest way to keep things cool but it's not really good for the fan motor to be always on when it doesn't need to be.
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, Jon (350 TBI!)
91 Red My website
. That's the cheapest way to keep things cool but it's not really good for the fan motor to be always on when it doesn't need to be.------------------
, Jon (350 TBI!)
91 Red My website
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Joined: Dec 2000
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From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
<font face="Verdana, Arial" size="2">Originally posted by JPrevost:
That's the cheapest way to keep things cool but it's not really good for the fan motor to be always on when it doesn't need to be.
</font>
That's the cheapest way to keep things cool but it's not really good for the fan motor to be always on when it doesn't need to be.
</font>
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