This is for the "LD9" 2.4l DOHC (Twin Cam) engine ONLY.


This writeup is original content of The J-Body Source. http://www.j-body.tk/∞ -- Written up by Kyle Strait
Reproduction is allowed as long as credit is given

Are you losing a quart of oil every month and have no clue why but know for sure it isn't leaking out and know for sure that it isn't getting burned?

General Motors decided instead of putting a Positive Crankcase Ventilation (PCV) Valve in the LD9, they put in an Oil/Air Separator. This is one of the number one replaced parts on the engine (according to my local Chevy dealer.) However this isn't the easiest repair to do. It involves pulling off your Intake Manifold. If you do not feel comfortable doing this swap, by all means, DO NOT do it yourself.

PARTS NEEDED
- Intake Manifold Gasket P/N MS95839 (Felpro P/N ... I did not get an OEM gasket... if someone has this number I'll update this page)
- Oil/Air Separator P/N 24574498 (best to get this from the dealer as I found that most part stores have no clue what this is)

STEP ONE

Picture 1
- Remove Intake tubing & plenum (Plenum bolts illustrated in Picture 1.) Inspect Plenum for oil. If there is no oil in there, chances are your Oil/Air Separator is good. But chances are there will be oil sitting in it, so you want to clean that out

STEP TWO

Picture 2
- Remove all electronic plugs and all hoses illustrated in green in Picture 2. Remember to pull the blue locking tab out of the fuel injector plugs before attempting to remove or you will break a fuel injector.
- Remove throttle cables illustrated in yellow in Picture 2
- Remove throttle body illustrated in blue in Picture 2

STEP THREE

Picture 3
- Remove Oil hose from engine illustrated in black in Picture 3 (the other end of this goes to the Oil/Air Separator)
- Remove Air hose from Oil/Air Separator illustrated in green in Picture 3
- Remove Intake Manifold illustrated in white in Picture 3

STEP FOUR

Picture 4
- Remove old Oil/Air Separator illustrated in Red in Picture 4 (Take note that the OIL line is illustrated in yellow and the Air line is illustrated in Green)
- Its highly recommended to clean your Intake ports on the head, the intake manifold, and the throttle body.


Picture 5
This is how it should look with the Oil/Air Separator removed and the Intake ports cleaned.

Reverse the process to reinstall.