Mystery wiring connector

[Matthew Ty]

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Could anyone tell me what this plug below the spark plug wires is?

 

[SUBURBAN5]

What year TBI is it? Im assuming Silverado?

 

[PlayingWithTBI]

If it's a C1500 5.7L the only 4 pin connector I know of is for the EST (Knock Sensor) module more towards the front of the engine (see red arrow). Will that wire loom reach that far?

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[SUBURBAN5]

I hope this helps you I actually have a different set up (vortec)

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[Matthew Ty]

It’s is a 1995 Silverado 5.7. Recently bought the truck and not sure what modifications have been done

 

[Matthew Ty]

Also the wires go into a larger section of the wiring harness with only about 1inch or free wires between the connector and the large segment of the harness

 

[SUBURBAN5]

If you do process of elimination of the pic and plugs do they all hook up? With nothing missing?

 

[Matthew Ty]

I didn’t see anything that wasn’t hooked up when I looked last. I’ll look into it more when I get off tonight. My new edelbrock air cleaner came in today so I’ll be under the hood tonight anyways

 

[Matthew Ty]

It looks like the plug next to the iacv in the picture you posted so I’ll see what I can find

 

[SUBURBAN5]

Sounds good keep me posted I'm sure we'll figure it out eventually