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Old 02-25-2011, 10:39 PM
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Has anybody ever seen this plug before??

1986 Pontiac Firebird VIN H
LG4 305. computer controlled carburetor. computer controlled distributor. 700R4 TRANSMISSION

I have no Idea what this plug is. I have looked through 2 different wiring diagrams and there seems to be nothing on this (I have gotten decent at reading the diagrams now too, I think.)
It is a 2 wire plug. The first wire is light blue, the second wire is tan (almost white) with a black stripe on it. This plug is right next to my TPS and o2 sensor plug (passenger side).
I have never messed with this harness. As far as I know it's all completely stock.

Here's a picture:



I know it's kind of a long shot in someone knowing this, I'm at the end of my rope though.

If anyone is bored and feels like taking a shot in tracking this thing here are the diagrams I've been using:

http://92b4crs.tripod.com/86wiring/86wiringindex.html

http://www.austinthirdgen.org/index.php?pid=19

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Old 02-26-2011, 12:18 AM
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I'm no professional, but It looks similar to those little sensors that plug into the window washer tank. If you've ever had to put a battery in a 90s GM car, (Monte carlo, grand prix etc) car, you'd know exactly what I'm talking about.
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Old 02-26-2011, 12:21 AM
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Poop. I've seen these on a few other things too. Fans and I think, and GM IAT sensors.
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Old 02-26-2011, 04:47 AM
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It looks like the plug for the charcoal canister,if that year had one.I am pretty sure it did.
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Old 02-26-2011, 06:26 AM
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got the washer tank labeled.

I'll look into the charcoal canister, thanks.
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Old 03-02-2011, 12:53 PM
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Might be the plug for the mixture control solenoid on the carb.
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