1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

Mystery Plug...?

Old Feb 20, 2025 | 1:11 PM
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Default Mystery Plug...?

Does anyone happen to know what this is? This is on a '98 Silverado 5.7. I've had the truck five years, never noticed this. Hopefully it's just a diagnostic plug. Thanks. - Jake

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Old Feb 20, 2025 | 1:35 PM
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From: Marysville, WA
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Looks "oldie-moldy" never in use before - but I don't know what it would go to
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