Wiring help! 97-99 sohc engine, can you identify this plug?

[410Fortune]

Okay dudes I am stumped
I have been trying to help find out where these two wires go
I have limited information

This was sent to me via email and pm on this forum by member @Colderjarl

For the last two days I have been trying to identify this wiring plug

All I know is 98-99 sohc engine
Passenger valve cover wiring harness for injector 3 has this extra wiring plug
Two pin,

Light green with white (lg/wh)
And
Light blue with orange (lb/or)


I remember from years ago dealing with this bracket on some years there are two things that hang on this bracket, I cannot for the life of me remember what the second thing was.?? I seem to remember there being two vacuum switches here or?

I don’t have books for a 97-98 sohc, only 2000+

All the trucks I have here at property are 04+ sohcs (different intake)

This has been driving me crazy so I turn to you guys for help!!

Whoever nails it gets a cookie and a big thanks so I can sleep at night

 

[J_C]

I already told him that I thought it was the Intake Manifold Communicator Control as that was the only thing I saw on a wiring diagram (attached below) with those two wire colors. I hadn't heard of this IMCC, but apparently it's a resistive gate sensor that gets opened under full throttle, should be near the base of the intake manifold.

I traced the leads from it on two other diagrams, green/white goes to PCM connector pin 46 (labeled IMCC) and lt blue/orange goes to fuse 13 in the under hood power distribution box (or another power feed fuse if the fuse box changed over years). All those diagrams are linked in my sig as 2nd gen wiring, "engine-controls-(n)-of-(n).pdf"

I don't really understand why that IMCC is needed, wouldn't the PCM figure out throttle from the TPS itself or MAF sensor? I'm wondering, since he's putting a '98 harness on a '99 engine, if Ford thought the same thing and got rid of this IMCC for '99 so he has nowhere to plug it in? IDK, but in some situations if the signal is supposed to be present but is wrong, it triggers a fault code P1549

 

[410Fortune]

Well shoot you got more details about it then I did … nice work! I spent 3 days trying to figure this out hahahaha

Anyone with a 97-98 can get a pic of this sucker?

If I was him I would be checking pins at pcm and c115 98 vs 99 and make sure nothing else changed

 

[donalds]

Knock sensor

AC pressure switch

 

[amj441]

Well shoot you got more details about it then I did … nice work! I spent 3 days trying to figure this out hahahaha

Anyone with a 97-98 can get a pic of this sucker?

If I was him I would be checking pins at pcm and c115 98 vs 99 and make sure nothing else changed

VIS Conversion

The 1997 and 1998 Explorer with the SOHC V6 came with a variable intake system (VIS) - also known as intake manifold runner control (IMRC). It was also available on some years of the Mustang with the DOHC V8 engine. I have found minimal documentation on the operation and performance of VIS. When...

www.explorerforum.com

Hey 410, found a post about the VIS system and I can see the module you are missing in the second post, second photo.
hope this helps!

 

[410Fortune]

Excellent!!!! Winner winner you guys rule

That was a wicked cool idea… I always called it a power valve because I never knew the proper name

 

[donalds]

Isn't that valve vacuum controlled based on manifold vacuum no electricity

 

[J_C]

This is just a sensor that tells the PCM the valve position. Without having the code to look at, ???

Edit: The above is not accurate, it's also (or instead?) a vac valve.

 

[amj441]

This is just a sensor that tells the PCM the valve position. Without having the code to look at, ???

Isn't that valve vacuum controlled based on manifold vacuum no electricity

Think of it as an Ac door actuator. The valve is controlled by this wire which allows for vacuum to be applied or not applied. The valve also has its own small vacuum reservoir that provides vacuum power during acceleration when vacuum is low. This valve is supposed to close at low speeds to increase intake runner length to increase torque and open at higher speeds allowing either bank to feed the other. this helps moderately with airflow. It was eventually an abandoned system that did not provide enough benefit for the added complication and vacuum leak points. I know my fathers explorer had this system and it felt like it worked, as my explorer never felt like it had the same punch.

 

[410Fortune]

Well said and explained

 

[J_C]

Think of it as an Ac door actuator. The valve is controlled by this wire which allows for vacuum to be applied or not applied. The valve also has its own small vacuum reservoir that provides vacuum power during acceleration when vacuum is low. This valve is supposed to close at low speeds to increase intake runner length to increase torque and open at higher speeds allowing either bank to feed the other. this helps moderately with airflow. It was eventually an abandoned system that did not provide enough benefit for the added complication and vacuum leak points. I know my fathers explorer had this system and it felt like it worked, as my explorer never felt like it had the same punch.

Thanks. This clears up some confusion I had, because on the wiring diagram, it is not shown correctly. There it shows this as only a resistive sensor, not a solenoid or other electro-mechanical vac valve, which is more obvious by looking at this picture of it.