V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

What is this thing?

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Old Jul 19, 2015 | 04:10 AM
  #1  
knightinblackar's Avatar
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Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
What is this thing?

Morning all!

Just got my motor out and found something a bit weird. What is this thing? It's on the passenger side bank right at the back of the block above the headers. It had some sort of electrical connection to it.


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Old Jul 19, 2015 | 08:51 AM
  #2  
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From: Chasing Electrons
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Re: What is this thing?

My guess is that it is the dash indicator sender for engine coolant. If it had a dark green wire going to it, my guess is even more so that it is for the dash indicator.

RBob.
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Old Jul 19, 2015 | 09:14 AM
  #3  
knightinblackar's Avatar
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From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: What is this thing?

Right I'll check wire colour and get back to you. Thanks again.
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Old Jul 19, 2015 | 09:57 AM
  #4  
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: What is this thing?

No its something else I think, I know cause I unhooked it on purpose.

it and the CCP valve are both run off the same part of the ECM that will not throw a code if they short out as they then fry that section of the ECM but it still kinda works.
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Old Jul 19, 2015 | 09:59 AM
  #5  
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: What is this thing?

https://www.thirdgen.org/forums/dfi-...77302-ecm.html
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Old Jul 20, 2015 | 08:36 AM
  #6  
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From: Chasing Electrons
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Re: What is this thing?

What Gumby said. Look at the front of the driver side (left) head, if it has a similar sensor it will be for the dash indicator light.

RBob.
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Old Jul 20, 2015 | 01:09 PM
  #7  
knightinblackar's Avatar
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From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: What is this thing?

Ok so this is the wire to the sensor thing



And this is on the driver side head at the front

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Old Jul 20, 2015 | 02:22 PM
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From: Chasing Electrons
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Re: What is this thing?

Alright, we have it. As Gumby posted the picture in post #1 is the electric fan switch.

With the sender on the front of the cylinder head (last pic just above) is for the dash indicator light. I'd forgotten that the dash sender uses the slide on connector style.

RBob.
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Old Jul 20, 2015 | 02:51 PM
  #9  
knightinblackar's Avatar
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Joined: May 2006
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From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: What is this thing?

Ok so the rear one is the fan switch, which I know works as the fan has come in and out, and the front is the sender for the dash light. Does this also send data to the gauge or is this another sensors job?
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Old Jul 21, 2015 | 07:57 AM
  #10  
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From: Chasing Electrons
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Re: What is this thing?

Originally Posted by knightinblackar
...and the front is the sender for the dash light. Does this also send data to the gauge or is this another sensors job?
If the dash has idiot lights, it is for that. If the dash has a temperature gauge, then the sender is for it. Dash could have either, but not both.

RBob.
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Old Jul 21, 2015 | 10:44 AM
  #11  
knightinblackar's Avatar
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From: UK
Car: 1984 Firebird S/E
Engine: 1985 2.8 MPFI
Transmission: 1985 T5 5 speed manual
Axle/Gears: 3.42/4.03
Re: What is this thing?

It's has the gauge pack so it must be for the gauge. Thank you so much for your help with this
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