My 1996 Duratec Mystique has had continuous IMRC problems ever since my Merc. dealer replaced this unit to kill off a CEL. The car ran like a rocket before and was returned a dog. Of course the dealer could not see / feel what I was talking about when I returned to the scene of the crime. The secondary runners would not open as they did before so the engine would not rev beyond 5000 rpm and was very flat in acceleration.
I opened the secondary intake valve linkage by hand and found that a Stanley 2" "L" bracket can be wedged into the linkage directly under the main throttle body. This hold the secondaries open at 100% and allows the engine to once again scream to 6-7,000 RPMs with a dramatic , smooth power curve. Low end torque seems okay and the power sweet spot has returned beginning at 3,500 RPMs and up. I finally pulled the #4 and #11 fuses to re-program the main computer to the new air flow values. My car is once again a rocket and I do not have to purchase another IMRC for several hundred dollars.
I can also remove the "L" bracket for dealership / valet parking to protection in one minute.
