From second link, I posted.
Originally posted by Ray:
Hey!
Explanation......The engine has, as tony stated, what you can consider two "airways" it can use. one, when the secondaries are not opened, is comprised of about half of the possible airways being closed with small round plates attached to a rod.
The smaller total airway creates an increase in torque (to get you going). Once moving, the IMRC "does its thing" and pulls the round plates 90 degrees, allowing air to flow through the other half of the airway as well, thus doubling your volume and creating a surge in horsepower........
If your problem is a faulty IMRC, then it would never open the secondaries. This would exhibit symptoms of normal driving any time you are below the secondary operation RPM, but a loss of power (since it isn't opening those plates) at 4K (or so).....
Ray
