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IMRC linkage? I assume that has the linkage for the secondaries? I did notice some flatness before the tranny was rebuilt and shortly after but it seems fine now. Looks like I will have to switch to my win98 hard drive and run my '95 Ford CD and get an idea where I need to look for the IMRC linkage. Ray we have ATX's not MTX's  . Later. Pepse.
'95 Mystique LS Young America, Moonlight Blue, V-6 ATX, LOADED.
REMEMBER: Always fasten your seatbelt as it makes it harder for the aliens to suck you out of your car.
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Yes but ATX's have clutches just the same and they can slip. I don't think that is the problem though in my case as it is not consistent and I do not have symptom Ray describes. the IMRC linkage can be seen under the throttle end of the Upper intake manifold. You can see it operate if it is working when you rev the engine into the 3700-4000 RPM range. It opens up the secondary intake manifold butterfly valves for increased airflow. If the linkage has fallen off however only one bank of the secondary valves will open. If the IMRC is not working none of the secondary valves will open.
I wonder if the operation of the IMRC unit can be inconsistent?
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IMRC operation can be VERY flaky, especially under heated conditions.
Also, to note: the bushing on the forward edge of the IMRC linkage can break and the linkage will, for the most part, remain in its horizontal position. This would indicate, if simply peering under there, that both are working, when in fact the front bank isn't working at al.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Ray: The inconsistent IMRC operation would apply to both generations of IMRC I presume?
If is working when inspecting at rest how does one tell of it is working consistently? How can we monitor?
You seem to indicate that it possible for the IMRC linkage to operate but for the secondary valves not to open. I assume this could be sporadic as well depending on friction. Thus when engine is cold the bushing is tight and it slips when heated and expanded. If so any way to correct? (screw .... etc.)
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Okay.. before this gets any further out of whack:
95's have no "IMRC" per se. They have a vacuum operated actuator that is, by default (no vacuum) pulling the secondaries open. When vacuum is applied (after the car is started) the secondaries are allowed to shut.
96+ have an IMRC. the IMRC is, by default, not affecting the secondaries, and they are closed by a spring. when the IMRC activates they pull the secondaries open, against the force of that spring.
So..
The "flaky imrc" comment by me was misleading to your particular problem.
I would search for the following:
a broken secondary linkage (copper rod that connects one bank to another) broken, allowing one to stay open and one to work properly.
or
a vacuum leak that would affect operation of the linkage
You say that you have observed the linkage working while sitting still. What do you mean by that? What did it do, and what did you do to cause it?
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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I'm feeling stooopid, but are there some pics on this sight to show me what to look for pertaining to the secondary linkage? I looked at my '95 Ford CD and didn't see anything that would help. On the one hand I am enjoying this help on working on newer cars but on the other hand I am missing the old cars wherein if it makes a strange noise I could pinpoint the cause in notime verses longtime. Like I said I am feeling frustrated, stooopid, whatever. Just bear with me peoples I'm not used to a car beating me and I don't want people annoyed at me.  . Later. Pepse.
'95 Mystique LS Young America, Moonlight Blue, V-6 ATX, LOADED.
REMEMBER: Always fasten your seatbelt as it makes it harder for the aliens to suck you out of your car.
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Ray: Fully understand the operation of the secondary valve connecting link rod and the principles for having primary and secondary induction (smaller longer diameter induction 'piping' for low RPM for faster airflow to improve torque etc., etc. and shorter bigger diameter piping for higher volume of airflow at higher RPM to supply the engine (pump). I replaced both of the plastic bushings when cleaning the UIM/LIM and adjusted secondary valves to be very lightly open. Secondaries are opened when IMRC is actuated at the 3700 to 4000 RPM engine speed. I observed the actuation when intentionally reving the engine to that level. The secondary valves are acting in unison as the link rod (steel with cadmium plating) is secure within both bushings.
What I was wondering was if even if IMRC was working when tested with the car at rest, whether is does so consistently and how would one know. Is there a diagnostic to determine if the IMRC were 'flaky'?
Also even if IMRC was working OK and the link rod was secure between the front and rear valve assembkly, is it possible for the secondary valve assembly external bushing that the IMRC link rod connects to and rotates the valve rods to become loose on the valve rods and fail to open the valves? That is, it looks like they are being opened but are not at least some of the time. I will have to inspect and see.
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