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.
