1G What's this harness for....

[o0GuitarKid0o]

I have this harness that I found under the manifold it's white and Black wires behind it what is it for? And there's some more pics of other ones I have no clue what there for thanks!

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[Archer Fabrications]

The pix are terrable..

Last picture could be a knock sensor plug.

 

[o0GuitarKid0o]

Srry I took pics from a video only way I could get even close to getting a pic the black and white wires have a connector similar Ina coolest temp sensor

To a*

 

[brads]

Try getting the wire colors for each one. Then compare them to the 1990 engine wiring harness info here. He spent a lot of time putting pics and wire colors up here, along with descriptions of what each connector is:

http://www.dsmtuners.com/forums/art...12841-1990-engine-control-wiring-harness.html

Pic 2 looks like the knock sensor, and pic 3 is probably the ignition timing adjust connector.

 

[VR-4 fanatic]

Might very well be the knock sensor. Do you have one installed that is not connected?

 

[95blackGsTurbo]

That is a 1g connector for a knock sensor. Typically it is unplugged when an engine is pulling timing, affecting performance, and the owner doesn't want to fix it the real way. The sensor are known for leaking and going back anyways so your best bet is to just replace the one that is or isn't there.

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[19Eclipse90]

Pic 1 I'd bet is a noise filter for a '90 tach circuit. Why it would be on a '91, I couldn't tell you.
Pic 4 is for the EGR temp sensor, only used on vehicles with California emissions.

 

[OCTalon]

Based on the 2G electrical post, I'd wager the knock sensor.

http://www.dsmtuners.com/forums/art...047-2g-engine-bay-electrical-connections.html

 

[1G Eclipse94928]

Based on the 2G electrical post, I'd wager the knock sensor.

http://www.dsmtuners.com/forums/art...047-2g-engine-bay-electrical-connections.html

this is a 1g

 

[OCTalon]

1G Knock Sensor

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FYI, this is what a 2G looks like for comparison.
http://www.dsmtuners.com/forums/151528363-post10.html