I need a pcv valve for wife's jag. Comes up no results in every parts place so they must have some stupid word or gang of 19 words that means pcv valve. Please what do they call it?
Sorry for the obvious anger. Everything I try to do with this car is just an overblown nightmare. Oh it's a blue 04 XJ8 n/a 4.2 (just in case there is a different string of words to describe this simple part depending on the model, year or colour).

 

Its called a PCV in the Mitchells manual and they use terms that the makers uses so..... It might be a dealer item due to the way it attaches to the plastic tube. I thought this was a crazy thing to have trouble with so I started looking as well. Good Luck.

BTW what's wrongs that you need a new one.

 

Thx. It's extinct as a dinosaur. I've wasted hours trying to find one. Problem is P0171 & P0174. Replaced o-rings on pcv hose cuz they were suspect. Code went away and l.t. trim #s went from 19.5% down to 1 - 2%. Then they just came back. So I'm replacing MAF as #1 suspect & pcv (if I can find one) as #2 suspect. I don't understand the pcv valve. It seems to flow freely in either direction even if I blow very quickly through it. Can't get any info on it so I can hopefully get a new one and throw the old one away as I am quite sick of trying to fix this car.

 

To directly answer your initial question. 'wtf is a pcv valve called in England?'

A part used, so we could flog cars in America.

Positive Crankcase Ventilation systems came in when California started emissions controls back in the early 60s.

If you want more info on the system from the UK, include UK in your search request and set your Google options to Global and not just US.

 

When I look up the codes I get this;

P0171
Bank 1 combustion too lean

Possible Causes:
Engine misfire
Air intake leak between MAF Sensor and cylinder head (OK this could be PCV related, but could be a dozen other things too)
Fuel filter / system restriction
Fuel injector restriction
IP Sensor fault (low fuel pressure)
Low fuel pump output
HO2 Sensor(s) (1/1, 1/2) harness wiring condition fault
EFT Sensor fault (low fuel temperature)
MAF Sensor fault (low intake air flow)
Exhaust leak (before catalyst)
ECM receiving incorrect signal from one or more of the following components:
ECT Sensor, MAF Sensor, IAT Sensor, IP Sensor, EFT Sensor, TP Sensor

P0174 is the same but for bank 2.


So, there are other things to consider than the PCV valve...unless the valve was leaking to the outside (manifold vacuum sucking outside air in through a crack in the valve housing?), I'm struggling to see how this might be the cause of your codes....


Remove the valve completely and plug the hoses. See what happens....

 

These Jag engines don't use PCV valves, that's why it's murky for you. They use a controlled orfice called a part load breather and a full load breather to vent the crankcase to the intake. Just look at the hose that plugs into the valve cover with a squeeze fitting on it.

 

L.I.B. I stand corrected even Mitchells manuals are wrong from time to time. Thanks Oldmots!

 

I don't think the part-load / full load breathers were carried into the 2004 model. I can find no restricted orifice thingy. What I do have is a ~3" diameter diaphragm looking thingy bolted to the passenger side valve cover with a hose going directly to the intake tract after the throttle body and MAF sensor. This valve or whatever does not have any significant restriction in either direction and I'm not sure how it is supposed to work. My reasoning tells me that a leak at this point into the intake tract will cause a lean condition because it is unmetered air. This is why I replaced the o-rings on this "PCV" pipe (or whatever it is).

 

Hey all, sorry I am new to this and not sure what to post where. I have recently purchased a 2004 XJ8 with the 4.2 and my crankcase vent valve is really loud, almost whistling. Its not thrown any codes, but I have ordered one because they are really easy to replace and I figured it was worth a ****. I've already taken it off and plugged one side and blew thru the other and air was coming out of somewhere. None of the hoses were bad on that side or the part load breather tube. So i guess my question is: If i plugged one side of the CCV and blew thru the other should air be coming out? Is that why it could be hissing loud? I took off my oil cap while running and it got really lous and stalled. I started it and put my hand over where the oil cap goes and it was still hissing. Do these go bad? It was real easy to blow thru without plugging it too btw. Any help would be greatly appreciated. Thanks in advance and I apologize if im posting in the wrong thread

 

A PCV valve.

Attached image of my PCV and no I don't know how it works either since

you can blow through it both ways.

 

If you cannot find parts in the US get in touch with David Manners Jaguar in the UK postage to the US is good and within 5 days, they know these cars inside out and are happy to help. Call them for the parts you are looking for as there web site does not show all they sell. Worth a try.

 

Try these 2 sites:

2004 JAGUAR XJ8 Parts - Land Rover Parts Center - Call (800) 574-9217 for Genuine Land Rover Parts and Accessories
$39.21

http://www.roverparts.com/Parts/LR003380G.cfm 800-533-2210
$42.95



X350 Workshop, Powertrain, Page 1911:
Vehicles with 3.5L or 4.2L engine
The PCV system consists of a valve, and two hoses. The PCV valve is mounted on the right-hand valve
cover and a hose is connected between PCV valve and the throttle body elbow. The left-hand valve cover PCV hose is connected to the air cleaner outlet pipe.

 

Quick question regarding the PCV valve - specifically the hose. My XJ8 (MY04) is throwing up lean codes as well (P0174 and P0171). I suspected vacuum leak, went lookng and as I moved the hose to inspect - it snapped (in half). I'd also heard some hissing while driving a few days prior.

Is that hose a part load breather or full? I'm getting conflicting information from suppliers.

 

Wow! Lots of information and mis-information going on here.

4.0L Engine:

Part load breather ORIFICE in LH [Bank 2] came cover. Small hose back to below throttle body.
Full load breather at RH cam cover, large hose from cam cover to induction tube.
NO PCV Valve.

4.2L Engine:

Part load breather is a large hose from the Crankcase Ventilation Valve, [saucer on top of RH Cam cover, SOMETIMES referred to as a PCV Valve] to the aluminum induction elbow behind the throttle body. A couple of earlier posts have pics of the Crankcase Ventilation Valve.
Full load breather is smaller hose in LH cam cover to the induction tube. NO ORIFICE in the 4.2L.

Note the crankcase ventilation DIRECTION is reversed between the two engines, based on where the source air comes from; it always comes from the induction tube so it is measured and filtered air.

Also note, the 4.2L ALWAYS has a hiss sound that seems to originate near the RH cam cover. It is the sound of the breather system passing air through the Ventilation Valve. It ALWAYS sounds like a vacuum leak, but it is a normal sound for this engine. If you think there is a vacuum leak, temporarily remove the part load breather hose from the induction elbow and plug the fitting to eliminate the normal hissing sound, and search for your vacuum leak.

Attached are a couple of bulletins that help with the 4.0L cars.

Hope that helps!

 

Check for the valve load plate....or load breather plate

 

I know this is an old post but I was looking for the same part and found that Carquest calls it a crank case vent valve. For anyone looking for such a thing that might help. I guess I'll find out if the new one is directional and flows one way as a PCV valve does.