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ka24e emissions removal


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hows it goin guys! finally got my xmember flipped and trans mount made< motor is in!! theswap254.jpg =) but i was actually wondering if anyone has a schematic or knows what i can take off the motor w/out effecting how my car runs? really my main concern is just the 2 valves that are bolted 2 the back of the head one goes to egr and i think the other goes to the fuel pressure reg. heres a pic:theswap054-1.jpg thanks for the help!

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Everything can come off. Exept the iac valve. The stuff is there for a reason. When you go removing stuff the ecu thinks its there. So the driveability is affected. On my sohc eveything is gone exept the iac valve. I can report little to no problems so far.

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Ka24e DIY Emissions Removal



1. Stock Intake

-- a. Emissions Parts

---- i. Location

2. Other Emissions Parts

-- a. Location

3. Vacuum lines

4. What to keep and remove

5. Going a Step Further

6. Disclaimer





Tired of looking at that stock intake and wondering what you can do to clean it up? Maybe add some power while you’re at it to? Well let’s take a look at what we can remove.


Here is a diagram from the FSM of the engine and emissions control devices. They are numbered for easy reading.





Stock intake


1. EGR control valve, this controls the quantity of exhaust gas that is let into the intake manifold. It is located on the back of the intake and has a metal tube that goes to the exhaust manifold. This can be removed and no codes should be thrown and no check engine light. If not a 100K ohm, 1/4 watt resistor in place of the EGR temp sensor in its place to fix it.


2. BPT valve, this monitors the exhaust pressure to activate a diaphragm that controls the EGR vacuum. It is located on the back and inside of the plenum and is on top. Really easy to spot. Remove it and no code will be thrown.


3. FPR, this is on the back of the fuel rail and is necessary for the engine to run properly. DO NOT remove it.


4. Pressure regulator control solenoid valve and SCV control solenoid valve. These are located on the back of the head, along with a bundle of hard lines and vacuum hoses. Remove them and that’s it, no codes.


4a. SCV actuator (not pictured), since the SCV solenoid was remove, this must be removed. This is located on the back of the intake manifold. It’s on the right side and controls the butterflies. Once it is removed you can do away with them as well. Each one is held in by two screws. Remove all four plates, the small screw in the middle of the intake and then pull the rod out. You can either have the rod holes welded shut or use JB weld.





5. Air regulator, located on the inside of the intake plenum, basically helps the car warm up when it’s cold. I kept this and if you drive your car in the winter or start it when it is cold you should do the same. Warmer climates probably don’t need this.


6. EGR Control Solenoid, toward the front on the left side and bottom of the intake. EGR is gone, so remove it.


7. IAA unit includes the ACC valve. This is located on the back of the intake plenum and controls the idle of the motor. Its one of the few things I kept and I believe is necessary for a good running, street-able engine.




Other Emission Parts



8. AIV case and control solenoid. It’s the big ugly mess on the drivers side strut mount. You’ve probably got rid of it already, but if not, go ahead and throw it in the trash, but be sure to plug the hole in the exhaust or the metal hose.


9. Charcoal canister, big black cylinder on the driver’s side front of the engine bay. Remove, the vacuum lines come later.



Vacuum Lines


After the removal of all the emissions comes the question of vacuum lines. On my current NA setup I have two vacuum lines, both maybe 2 inches long. How did I do this? Easy, if you have the same setup as me every vacuum line can be removed, except for two. The bundle of hard lines that run down the middle of the intake can be removed and the lines that run to the charcoal canister can go to. I went as far as even removing a hard line that runs from the transmission tunnel to the charcoal canister. It’s the fuel tank vent and the hose needs to be left unplugged.


Now what lines to keep? The FPR will now be the only thing that needs a vacuum source. All I did was run a line from the intake hard line to the hard line on the fuel rail and then a line from that to the FPR.






What to Keep and Remove




i. Air Regulator

ii. AAC unit

iii. FPR



iv. EGR

v. BPT valve

vi. PR and SCV solenoid

vii. SCV actuator and butterflies

viii. EGR control solenoid

ix. AIV case

x. Charcoal Canister



Things Kept






Going a Step Further


Want to go the extra mile for the clean look? Here’s a few tips on what to do.


• Extend the injector plug wires and other harness plugs and run the wiring harness under the intake.


• Grind off the BPT valve tabs (pictured)


• Remove coolant lines running on plenum and grind off hard lines and block left after removal. (pictured)


• Remove vacuum source on the left side of plenum


• Grind off ECCS


• Paint Cast-Coat Aluminum for a nice finish





- I am not responsible for any harm done to your engine by following this guide to removing emissions. I’ve had no problems in the year I have had them removed. If you live in an area with emissions testing I suggest you do not remove anything. Any questions and/or concerns can be sent through a PM or email.


All text and images Copyright Justin Glaser 2006










Memo 1A. This refers to a U.S. Environmental Protection Agency (EPA) memorandum that says it's illegal to remove, disconnect or disable a required emissions control device on any pollution controlled motor vehicle (PCMV), pretty much any 1968 (1966 in California) or later model year car/light duty vehicle used on public roads. What this means is that even if you don't have a local emissions-testing requirement, technically you can still break federal law by chucking/disabling your vehicle's smog equipment.


especially since your in cali it is illegal to remove the emissions off of your motor, if you get caught, just fyi

Edited by NorCalDime
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holy shit! thats what im talkin about! those are the kind of instructions i dream of,exact,tell u what it does, and show a picture sure as hell not ikea instructions! lol even down to the disclaimer, ..so professional its kinda scary..u dont work for a smog station do u?? lol. thanks alot! i got work 2 do!

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What is the SCV butterfly assembly and what does it do? I can't think of an acronym to describe it, probably because I just got off work. I was wondering what the function of that thing is though. It's on the truck multi-port injection manifolds as well.

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