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Old 09-02-2013, 08:30 AM   #61
badazz2010focus
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where is the actuator for the irmc?
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Old 09-02-2013, 10:58 AM   #62
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where is the actuator for the irmc?
Behind the throttle body, you'll see the little actuavor arm.
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Old 09-02-2013, 07:20 PM   #63
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When i had the flapless intake on and i turned the AC on i lost alot of power. Now i dont notice any difference if its on or off during normal driving.

The flaps really help its low end torque.
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Old 09-08-2013, 12:48 AM   #64
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Thanks for all the great information. I have a question I'm hoping someone familiar with the IMRC can help with.
I recently purchased a 5 speed 07 zx3 and I've been trying to troubleshoot a misfire which occurs at part throttle around 2000 rpm (only misfires once then stops, until I let off the throttle and give it throttle again). It also feels like the engine is surging while cruising on the highway, or anywhere at a steady speed and rpm with little throttle.
There is also a noise that I thought was a bad lifter, etc, but I've verified that it is the IMRC (tumble flaps) that are making the noise. Removing the vacuum line that goes to the IMRC diaphragm makes the sound go away completely. I think that the IMRC diaphragm or some part of the system is causing the flaps to open and close and is causing the problems with the misfire/surging and the ticking noise at idle.

Can this be repaired or does the whole manifold need to be replaced? Is it just the diaphragm that is bad, or is the linkage or flaps damaged?

Would it be better to drive around in the mean time with the vacuum line going to the IMRC diaphragm disconnected? Doing so caused a CEL.

Thanks for all the valuable information already provided and for any advice you have.
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Old 09-08-2013, 06:55 AM   #65
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If im not mistaken unhooking that line will leave the flaps open fully. The vacuum line only closes the flaps and helps control the air velocity between 500 and about 3-4k rpms after that i believe they are fully open

DO you have a tune? if you have a tune ill bet your tunner could read a log file and tell you exactly what the problem is.

coil pack, plug, injector could be many things.

How does it drive with the vacuum line off?

how many miles are on it? when do these engines nee da tune up?
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Old 09-08-2013, 01:51 PM   #66
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I plugged the vacuum lines and the misfire appears to have gone away as well as the ticking. Is it ok to drive like this until i get it fixed or will it cause problems? Can it be fixed with a new diaphragm or does it need another manifold? I do not have a tuner.
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Old 09-08-2013, 02:02 PM   #67
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I plugged the vacuum lines and the misfire appears to have gone away as well as the ticking. Is it ok to drive like this until i get it fixed or will it cause problems? Can it be fixed with a new diaphragm or does it need another manifold? I do not have a tuner.
As far as a misfire, that would have nothing to do w/ the imrc's. That'd be a plug or coil. I'd try replacing the plugs to start with. The ticking noise is the flaps in the intake manifold. To fix that= pull out the flaps or replace the whole intake manifold. The actulator just opens & closes the flaps.
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Old 09-08-2013, 02:09 PM   #68
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It may not be a misfire. I think the flap would open and then close and was causing the engine to stumble.
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Old 09-08-2013, 06:30 PM   #69
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I think there are 2 parts that control the IMRC the diaphram thing and then another unit that plugs to the diaphram.

The vacuum line runs from the front of the intake into the first unit and then into the diaphram maybe it monitors how much vacuum the diaphram gets?


When you removed the vacuum line from the diaphram did you notice any improvement in acceleration or power?

Ide be a little concerned myself with this "ticking" sound your talking about. If it went away when you disabled it.

The last thing you want is one of those flaps to get sucked into your intake ports. It can really damage your head and could detonate the engine.

Since ive pulled mine out, i have 4 new extra ones. If you have one about to break ill send you one but dont let it go and risk blowing your engine.

I didnt find it to be that hard of a job myself. THe hardest parts is finding the corrrect extensions to get to all the bolts and hooking and unhooking the PCV tube on the back side of the intake.

THe bolt on the bottom of the intake can be tricky to get to also
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Old 09-08-2013, 07:47 PM   #70
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The stumble it had is gone since disconnecting the vacuum line. There is another issue I'm trying to trouble shoot which i think may also be caused by the imrc, when decelerating below 3000 rpm i can feel the engine shuddering. I think this is because the ecu is tuned to close the flaps when decelerating and that is no longer happening. Had anyone else noticed an engine shudder when removing the flaps or disconnecting the vacuum line?
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