This page has been constructed to show a way to modify the
stock PCV system of a second generation Dodge/Plymouth/Chrysler Neon
in an effort to keep it from sucking oil into the intake manifold.
Disclaimer: I have no proof that this modification works. I have no proof
that this modification is harmless to your vehicle. It might void your
warranty, or cause your vehicle to run poorly, or maybe even damage it.
If you duplicate anything on this page, you do so at your own risk.
All the modifications shown assume your vehicle is in stock condition.
Slight differences may need to be accounted for if you have already
modified your vehicle.
On to business... First, collect the following parts (Shown in image below):
- A 3/8" to 1/4" female to female threaded pipe coupling.
- A 3/8" barbed hose fitting with 1/4" male pipe threads.
- A 3/8" barbed hose fitting with 3/8" male pipe threads.
- A PCV valve that will fit a second generation Neon.
- A PCV system elbow (one can be taken from the stock PCV system.)
- About 3'-4' of 3/8" hose suitable for PCV applications.
- A 3/8" to 3/8" barbed hose splicer.
Step 1: Take the 3/8" to 1/4" female to female threaded pipe coupling (Item 1) and into the 1/4" threaded side, place the 3/8" barbed hose fitting with 1/4" male pipe threads (Item 2) and tighten them together.
Step 2: Take the PCV valve (Item 4) and thread it into the 3/8" threaded end of the coupling.
Step 3: Take the PCV elbow (Item 5) and slide the smaller end of it onto the barbed fitting.
Step 4: Slide the larger end of the PCV elbow onto the nipple on the rear side of the valve cover.
Step 5: Take the 3/8" barbed fitting with 3/8" male pipe threads (Item 3) and thread it into the spot on the end of the valve cover where the stock PCV valve used to go. CAREFULLY tighten it, taking great caution to not overtighten it. Too tight and your valve cover may crack... an expensive mistake!
Step 6: Take the 3/8" to 3/8" barbed hose splicer (Item 7) and press it into the PCV hose that protrudes from the side of the airbox.
Step 7: Carefully measure and cut a section of the 3/8" PCV hose (Item 6) to go between the old PCV valve location and the airbox. Press the hose over the barbed fittings at the airbox, and old PCV valve location.
Step 8: Measure and cut a section of the 3/8" PCV hose to go between the new PCV valve location, and the nipple on the intake manifold. Press the hose onto the PCV valve, and onto the intake manifold nipple. The hose will be a tight fit on the intake manifold, and may not fit at all depending on what type of hose you are using. Further modification may be necessary if it doesn't fit.
Step 9: At this point, it may be a good idea to secure all the connections
in the system with hose clamps of some kind if you are so inclined. They are
cheap insurance against future problems.
The PCV system will now draw crankcase fumes out of the back of the valve cover
instead of out the side. This is possibly advantageous because the surface area
of the inside of the rear of the valve cover is much larger than the surface
area of the inside of the side of the valve cover, and so much greater forces would
be necessary to cause oil to pool at the rear of the cover enough to exit through
the PCV system. There are other ways to implement this modification in a cleaner
way, but this way was chosen in the interest of keeping the stock PCV valve. A
non-stock valve of the kind with hose fittings on both ends rather than 3/8"
threads would greatly simplify things.
At this point the modification is still being tested. It has not yet been concluded
whether it even works at all. Stay tuned...