Imrc

[soxbaseball]

what is the IMRC and what does it controll and do

[B3NN3TT]

There are 12 runners on the intake manifold, but only 6 cylinders. So the lower intake manifold has 6 of the 12 runners blocked off at nearly all times, and only the long runners are used. Better low-RPM torque is achieved with less air volume and more air velocity.

However, when the engine reaches 3500+ RPMs, the IMRC activates, and opens the other 6 short runners in the LIM, giving your engine double the air volume as at lower RPMs.

This activity allows the V6 to have great low-end grunt, as well as high-RPM pull, without the problems or complications of variable valve timing.

[cwtIII]

So, is there a way to check to ASSURE that your secondaries are opening? (I feel like I don't have the higher RPM "pull" that I used to have but I'm not certain).
Thanks!
Charles

[B3NN3TT]

If it's not opening you won't wonder - you'll know. It devastates your powerband.

Take off the plastic shroud and unplug your IMRC, then go out for a spin. You'll see.

[Gorman]

you could rev the engine at the throttle body and at the same time look under the throttle body and see if the linkage moves when you rev above 3500 rpm.... G.

[B3NN3TT]

you could rev the engine at the throttle body and at the same time look under the throttle body and see if the linkage moves when you rev above 3500 rpm.... G.

Yes, but you can't FEEL that in the seat of your pants; and it could still work then but not on the road.

If you can feel first-hand a stuck secondary linkage by pulling the plug, then you'll know immediately when yours does actually stop working, and you won't have to ask about it.

[rbls4ever]

this car really is a pig with the secondaries not working. sometimes when the imrc starts to go bad the runners can flutter. making power output unsteady

[rekkymech]

It is an electronically controlled servo that operates the opening of the secondary butterfly valves remotely by means of a cable attached to the linkage.

[megeh piggeh]

It is an electronically controlled servo

ne ever try using a servo to do this or will it mess with the ecu...i have an idea on trying it but i was seeing if ne1 has done it b4