Has your gas mileage been in the shitter lately ? One of the reasons could be because your pcv valve is clogged up. It is really easy to change this item on Ls integras and type r integras, but it is pretty hard on a gs-r because of the fact that the manifold curves down instead of up, so I figured that I'd post a detailed how-to for my fellow gzzzrrrrr owners.

Well apparently when you change the pcv valve , it increases your gas mileage significantly, and my gas mileage sucked, so I decided i'd give it a shot. You are actually supposed to replace it every 6 months anyways. I got the pcv valve from advanced auto for 3.50$ (from what i understand, it is just about the same as the oem part, but 15$ cheaper !)

This is the location of the pcv valve on a gs-r motor.


Some people say that they can change the pcv valve on a gs-r by just squeezing their hand under the manifold; well these people must have girls hands because there was no way I was going to be able to pull it out with that little space. So I actually took of the throttle body....the whole thing took me around an hour, just because the hoses were so tight on the throttle body. Anyways, here goes....

Before you start: Shake the new pcv valve. if you hear something shaking inside of it, it is good; if you dont hear something shaking inside of it, then it is defective.

1. Remove intake arm. Undo the breather tube that goes into the intake arm, and take off your intake arm completely from the motor.

2. Remove the throttle body. There are four screws around the perimeter of the throttle body. unscrew them completely, and then finagle the throttle body a bit to break it loose from the throttle body gasket. At this point you will notice that the throttle body wont move too much because there are 2 coolant lines going inot it, one right below the throttle body opening, and another to the right of the throttle body. disconnect these two lines, but be sure to point them up when you do, as coolant will drip from them if they are pointed down. It will take a while to disconnect them due to the age of the tubes. Just keep wiggling them and pulling at them and they will eventually come off. Now remove the throttle body from the intake manifold. While my throttle body was removed , I siezed this opportunity to clean it out with a clean dry rag, and clean out the entrance to the intake manifold.

3. Locate the pcv valve. refer to the above diagram for the exact location of the pcv valve. It will be a small L shaped valve right under the intake manifol/fuel rail. It will go into a black box connected to the back of the engine, and the other end will be connected to a tube that goes into the intake manifold.

4. Remove the old pcv valve. grab the pcv valve by the L-shaped part, and wiggle it around firmly in order to pull the wide end out of the black box. It will most likely be connected into the box pretty frimly, so just keep wiggling it,twisting it, and yanking at it, until it comes out. Once you popped it out from the black box, twist it around and pull the other end out of the tube. This is easiest achieved by just, once again, wiggling away, and turn the pcv valve while holding the tube with pliers or something, until it comes loose.

5. Connect the new pcv valve Connect the tube to the pcv valve first, in reverse order as above, and then push the wide end of the pcv valve firmly into the black box.

6. Reconnect the throttle body and intake arm in reverse order, and you are done !

Now drive around and enjoy much better gas mileage !!