Civic VX PCV valve, or lack there of.
 

It seems like all the conversation about PCV valves has become rather scattered between a number of pages, making it hard to fallow, and hard to compare to get clear information as to what is going on, so if you have information on the proper PCV valve set up for a civic vx, please post it, and site where you go the information from, as I've gotten information from dealers that disagrees with what the parts store say, and online dealers disagree with what local dealers order.
but really, I want to know if I should take the valve out of my pcv system.

does this diagram help? you're looking for #6:
https://www.hondaautomotiveparts.com/...sr30_d0101.gif

https://www.hondaautomotiveparts.com/...EATHER+CHAMBER

THIS Has all the proper info on the VX/CX PCV valve. The info is taken straight from the parts catalog for all Honda/Acura vehicles in the U.S.

So if the dealer tries to give you a part number with anything other than P07 in the middle of it, it's not meant for your VX/CX.

see, the thing is, when I went to the dealer 6 months or so ago, and asked for part number #2 in the diagram that lindermant posted, the part they tried to sell me looked like #6, of course the hoses are not long enough for a 90degree elbo to fit where part #2 is suposed to fit, but they swore it was right right part, that honda had "updated" the part, and that the straight bit was no longer avalible, but I wonder if someone mixed things up, and what they tried to sell me might have been the part that goes were the pcv valve would normaly go.
to further confuse things, when I went to Advanced Auto (parts store), they said that yes, the VX does get a PCV valve, and that the CX and VX have compleatly differnt pcv valves, one of them gets a straight valve, the other gets a 90 degree bend and they both have the innerds.
so it seems that every place I can get parts from disagrees with what you guys are saying.
Tomo, could you give the part number for the pcv joint, part #2 the the drawing above, so that monday when I'm near the honda dealer, I can walk in with the part numbers, and this new information, and see what they can tell me, I suspect that part they tried to sell me befor should still be in their stock, even tho they had to order it for me.

Part #2 is not a PCV valve. It is strictly a hose barb. It has no innards. Part #6 is a PCV valve, it does have the innards (it is a 1 way valve, like all PCV valves).

I wonder if I need to get a new valve...I think I'm using a d15b7 pcv valve on my cx intake...:(

#2 is only available as a right angle part now, 11854-P07-A00. It also shows that the 90* PCV valve is no longer used, it's is supperceded by part 17130-P2M-A01 that is the PCV Honda used on 96+ civic models. So basically it looks like they've discontinued the original part number. The picture I get with my Honda software is attached as a PDF.

Here is a link to the Honda e-Catalog. Honda e-Catalog
Username: hondapc
Password: hondapc

IF you have trouble getting it to work right check the troubleshooting link under the login area.

Honda does have some issues with associating part in diagram with correct part. I have no idea how extensive a problem it is, but I've seen it first hand on at least one occasion. Case in point: According to Honda parts diagrams and associated part #'s, the bottom clutch pedal switch takes the larger switch. That part will NOT fit where the diagram shows it fitting--it only fits where the larger top switch goes.
A couple weeks ago, I purchased part 6 & 4 from a Honda dealer (for 92 Civic VX). The PCV valve (part 6) has innards, and though restricted, air can be blown through it in both directions. I checked/cleaned part 2. It appeared to be original Honda part (blue plastic with innards).
The parts fit good, car runs good & I'm getting around 58 mpg with apprx. 60% highway miles with no engine off coasting, so I guess the parts are working.

when I replaced the straight hose barb (#2) it was empty as well, I ended up carving out the innerds of a straight PCV valve to make a new hose barb fitting, as I was expearincing some vaccum leak in the hoses, and fittings, the biggest leak was at the gromet (#3) and of course the #4 hose was pretty dry and starting to crack as well, but of course the very first part I replaced was the empty 90 degree pcv joint (#6) and tossed the old part, installing a PCV valve.
I'm a bit baffled as to why the VX isn't suposed to have a PCV valve, but the dealer, and every other auto parts store will sell you one.

Anyone know why they didn't put an empty pcv valve on the insight, or if there is any reason why I shouldn't empty the one on my insight?

Thanks guys!

Frank
:)

In previous discussions, I was told that the proper VX PCV "valve" was just an elbow with a restrictor orifice in it. Normal PCV valves will let air flow fairly freely when the pressure difference/flow is low, but a spring-loaded plunger heavily restricts flow (but doesn't stop it) if the pressure difference increases enough.
My only guess is that the VX's cruising conditions resulted in either too much, or too little ventilation in the crank case when paired with a typical PCV valve. Beyond that, I don't see why a typical valve couldn't be used.

Can we just call you "Bruce" to avoid any confusion?

Anyway - the PCV valve restricts flow from the crankcase to the intake manifold when the manifold vacuum is high - closed throttle. When the throttle is opened and manifold vacuum decreases, the PCV valve opens because the plunger inside of it is not being pulled down by vacuum as strongly. The point is that at a larger throttle opening, the engine is consuming more fuel, more blow by gets past the piston rings, and the crankcase gases need to be consumed.

The VX has a fixed orifice PCV valve which Toyota has also used in earlier PFI engines.

The primary drawback to a fixed orifice PCV valve is that the line between the crankcase and the intake manifold cannot be closed off. The spring loaded PCV valve completely closes off the vacuum line when the engine is turned off or when there is positive pressure in the intake manifold. This prevents igniting the blowby gases in the crankcase if a backfire occurs in the intake manifold.

The flip side of a backfire into the intake manifold with a spring loaded PCV closing off the crankcase is that the intake manifold could explode! - this has happened with GM composite manifolds appararently.

Intake manifold explosions shouldn't be an issue with port/multi-point fuel injection engines (that is, almost every fuel injected Honda engine). Unlike a throttle body injection system, there is at most a few cubic inches of air/fuel mixture in the intake manifold at any given time. Yes, it could backfire, but the results would be less than impressive.
As for on-throttle blow-by, there's an unrestricted breather tube from the valve cover to the air intake tube before the throttle body. When cruising (high manifold vacuum), the little bit of air flow that makes it past the PCV valve keeps a constant flow of fresh air into the crank case through that breather. When accelerating (low vacuum) any excessive volume of blow-by gasses would just make the air flow through that valve cover breather tube reverse, injecting crankcase gasses in upstream of the throttle body.