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Old 09-18-2015, 05:15 PM   #1
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Please help identify plug and relay

the plug is just forward of the carb and the relay is mounted at the rear of the drivers side valve cover. This engines has been converted to EFI, so I wonder what the original purpose was?
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Old 09-18-2015, 06:10 PM   #2
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Peter, I found that same relay on the 1986 345 that I dismantled. I did some research and the best I could come up with is the relay is used as part of the emissions system. I don't remember exactly what as I had no plans to use it on my Argosy.

Hopefully someone more knowledgeable will chime in with info.

Brad
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Old 09-18-2015, 06:12 PM   #3
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It is/was part of the AIR system. I remember it would actuate the valve that sat at the end of the injection tubes.
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Old 09-18-2015, 06:17 PM   #4
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Quote:
Originally Posted by overlander63 View Post
It is/was part of the AIR system. I remember it would actuate the valve that sat at the end of the injection tubes.
Terry, that makes sense. That 345 did have the air injection system.
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Old 09-18-2015, 07:11 PM   #5
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Quote:
Originally Posted by overlander63 View Post
It is/was part of the AIR system. I remember it would actuate the valve that sat at the end of the injection tubes.

thanks Terry and Brad, always can count on the guys with the experience.
One side of the plug is hot with ignition on, just dangling on top of the engine. I guess I can carefully remove everything related to that.
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Old 09-21-2015, 10:35 PM   #6
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Peter, I can't get the pic to display right now, but I believe I have the same "relay" on my '82 ('81 chassis). I also tried to figure out what the heck is is for. I do believe it has something to do with the emissions. I think one of the wires from the distributor electronics runs to it and I thought it did something based on engine rpm. I wish I knew as well. Of course here in Calif I have to keep all emissions equipment in working order as to be able to smog the MH every two years.


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Old 09-21-2015, 10:49 PM   #7
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It also could be something used if the original choke stove was converted to an electric choke. That had not been done on my AS 310, but had been done on my GMC motorhome with the 455 Olds engine and Q jet.
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Old 09-21-2015, 11:57 PM   #8
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Might have never been used...

Open the hood of any new vehicle and you will generally see several unused connectors. Depending upon what options were ordered (or not).
Even more if you look under the dash or at the wiring harness...

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