Quest. About CAI For 2006 4.7 - Jeep Commander Forums: Jeep Commander Forum
Intakes Questions or advice about intakes? This is the place...

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post #1 of 14 (permalink) Old 10-05-2009, 04:00 AM Thread Starter
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Quest. About CAI For 2006 4.7

Wanted to know if any one thats installed the k & n CAI on a 4.7 V8, if you have to keep the intake plenum(the black thing that says 4.7 V8 under the hood) off, after you installed the CAI. I know its really a useless piece of plastic but i actually like it! Oh, im new to this site but really love it. Pics coming up next week!
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post #2 of 14 (permalink) Old 10-05-2009, 07:08 AM
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Yes in order to use the K&N you must remove that piece.

06 Sport-4.7L with QT2

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post #3 of 14 (permalink) Old 10-05-2009, 06:09 PM Thread Starter
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Thanks J! Is it the same with all the CAI(AFE, AEM,Airaid)?
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post #4 of 14 (permalink) Old 10-05-2009, 08:00 PM
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I believe so. A quick check of their websites should confirm.

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post #5 of 14 (permalink) Old 10-05-2009, 09:50 PM
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K&N you remove the plenum, AFE uses the plenum since that's where the Mass Air Flow sensor is located. The K&N moves it to its tube.

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post #6 of 14 (permalink) Old 10-08-2009, 02:41 PM
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Removed the big plastic box on mine, and did not recall a mass air sensor. Don't think the 4.7l has one. If it did and it was removed, the vehicle wouldn't run correctly. Seems the purpose of that plenum box is to remove intake noise, hence, when an CAI is installed, sounds like "Darth Vader" at startup. I think what RWMorrison is referring to is the "air charge temp" sensor.

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post #7 of 14 (permalink) Old 10-08-2009, 03:27 PM
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i thought the AFE removed the plenum....


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post #8 of 14 (permalink) Old 10-08-2009, 06:07 PM
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You didn't ask about AEM but I had to remove it on my AEM 4.7 install. I had to plug something back in about midway down the tube(see picture).
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4.7 4x4, AEM Brute force CAI, Hella's behind grille.
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post #9 of 14 (permalink) Old 10-08-2009, 09:31 PM
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The MAF sensor is located on the hose intake on the plenum, it has two wires running to it. All modern fuel injected engines have one to tell the computer how to enrich or lean out the mixture based on air temp & volume.

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post #10 of 14 (permalink) Old 10-08-2009, 10:31 PM
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Actually that is a IAT sensor that is in the hose and was transfered to the new tube. Stands for Intake Air Temperature.
The MAF is located just prior to the throttle plate. It looks like a fine screen.
The Manifold Air Flow sensor is heated and the air flowing through it cools it.
The resistance of the heated screen changes with air flow (throttle position, and RPM)
The combination of IAT, MAF, and MAP, (Manifold absolute pressure) help the ECM determine air temp, air density, and current manifold vacuum in conjuntion with the TPS,
(Throttle Position Sensor) to make its fuel trim adjustments.
There is more, but....how much info before ones brain bleeds?
Anyways, the box is a Heimholtz Chamber.
It smooths the airflow but its primary function is noise reduction.
Think of it as a muffler for the intake pulses, and on some vehicles it does become restrictive towards the top of the RPM range.
As a result, some engines will show a slight increase in power in the last 1000 RPM or so prior to redline.

Rob


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