Quick question about IRMC valve...

[5.0stang]

I was told by a mechanic that the IRMC valve sits vertical and when it is vertical it is open? That does not make sense to me. A throttle body lets in air by being horizontal (wide open throttle), so why doesn't the IRMC valve work that way?

Summary: He said when I ziptied it open that I closed the valve?

Hope that made sense, suggestions?

David

 

[naval-avi8or]

I was told by a mechanic that the IRMC valve sits vertical and when it is vertical it is open? That does not make sense to me. A throttle body lets in air by being horizontal (wide open throttle), so why doesn't the IRMC valve work that way?

Summary: He said when I ziptied it open that I closed the valve?

Hope that made sense, suggestions?

David

The secondary butterflie the are actuated by the IRCM are locate in the lower intake manifold which is mounted directly to the block. The air flow thru this area flows downward into the combustion chambers which results in vertical=open and horizontal=closed.

 

[NebraskaSHO]

http://www.shoforum.com/showthread.php?t=65839

Post 8 shows the IMRC box

 

[Wess]

The secondary butterflie the are actuated by the IRCM are locate in the lower intake manifold which is mounted directly to the block. The air flow thru this area flows downward into the combustion chambers which results in vertical=open and horizontal=closed.

In short, your mechanic had it bass-ackwards!

 

[5.0stang]

The secondary butterflie the are actuated by the IRCM are locate in the lower intake manifold which is mounted directly to the block. The air flow thru this area flows downward into the combustion chambers which results in vertical=open and horizontal=closed.

Looks like the mechanic was right.

Looks like I had it backwards. I thought it would act like a regular throttle body. Pushing against the spring opens the valve to let air in. I guess it does the opposite with the IRMC.?

Thanks guys!

 

[SHOZ123]

Here's what you need to see......

 

[5.0stang]

Thanks for the pic. Unfortunatly I do not have the car where I can readily look at it, so I just go by my "bad" memory.

I remember pushing 'against' the tension of the spring and holding it while I ziptied it. Would that not open the valve?

The mechanic told me that the valve is open when the car is off True?

 

[SHOZ123]

Yes and yes.

 

[HotRodKid]

they are designed so that if the actuator fails, the valves are always open

this way you loose SOME bottom end power, instead of loosing MOST of your top end power

 

[NebraskaSHO]

I thought if the box broke they were stuck shut?

 

[HotRodKid]

i might be wrong on the v8's ... so dont quote me ....

 

[SHOZ123]

V8 is shut if the IRMC setup fails as it is normally closed, cable to open operated. V6 is stuck open as it is vacuum operated, normally open.

 

[5.0stang]

I'm talking about a 96 SHO, a v8.

I got some saying that it is open when the car is off and some saying it is closed

When the car was off, I had to "pry" the spring to ziptie it. I assume I was opening the valve?

The mechanic told me that when the car is off, the valve is opened. I presume he was thinking of v6's, and not the v8, right?

 

[stephen newberg]

Correct, he is thinking of the 6, not the 8. On the Gen III V8 SHO the butterflies close when the IRMC fails. So, when you sire it against the pull of the spring on that arm, you are wiring it open.

pax, smn

 

[5.0stang]

Thank you very much, I thought I had a brain fart while doing it.

I thought the car had felt more sluggish in the higher rpms after the mechanic had worked on it.

I don't know how much the IRMC opens because the swivel that the cable goes around in the IRMC box broke and made slack in the cable to the butterflies. I guess it still partially opens.

So I'm guessing it is a matter of time before the light comes back on

 

[SHOZ123]

If you unplug the IRMC box it will sooner or later quit issuing a code.

 

[njsho38]

since were on the subject. my imrc just broke, you can hear the difference. i was thinking about zip tieing it before i remembered reading people wiring them open. I was wondering who knew what i had to wire up to make it stay open. Also i was thinking about wiring it to a switch so i could play with it alittle in the car, it sounds like i have to do something to the ground wire to open and close it???

 

[SHOZ123]

If it is broke how are you going to actuate it? I haven't heard of anyone electrically modifying the IRMC.

 

[njsho38]

before i was going to get a new imrc i was thinkin alternatives and i think that the actuator works by grounding it to open the short runners. i was thinking about putting in a switch at the ground if this was the case

 

[SHOZ123]

There really is no advantage to operating the IRMC differently than what the factory has.