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Please help to identify this PLUG under the hood!

Old 06-17-19, 08:04 AM
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Question Please help to identify this PLUG under the hood!

Hello all,

I came across a blue/yellow plug right behind the water pump hosing. Can't remember what it's for...
Could anyone confirm please?



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Old 06-17-19, 08:18 AM
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I could be wrong but I really feel like that is not a factory plug.
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Old 06-17-19, 08:43 AM
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The car is 1993 LHD, manual tranny.
The harness is original. So is the plug...
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Old 06-17-19, 08:49 AM
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Looks like it could be the EGR switch plug with the outer part of the connector's shell broken off. The non-Cali cars didn't have EGR switches so it's a not used plug.

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Old 06-17-19, 08:58 AM
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Yes, you are right - part of this plug's plastic shell is broken off.
If it's indeed for EGR switch, I don't see it this diagram...

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Old 06-17-19, 03:01 PM
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^Wow, that diagram has TONS of stuff wrong on it. Don't reference that!

If you search around, there are TONS of posts on the "what is this blue plug" - all 93's had that plug and only the California emissions cars had it hooked up. It's a very common question, up there with the mystery empty pipe in the rat's nest.

I'm 99% sure that's the EGR switch plug. Just leave it be, you're fine.

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Old 06-17-19, 04:15 PM
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LOL, that diagram is one of those pictures where the more you look, the more you find wrong with it
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Old 06-18-19, 11:04 AM
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Yes, the car runs fine without it. I was just curious.
Thanks all!
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