will moving the vacuum feed to the oils seperator pcv (below the inlet manifold) to the air cleaner side of the throttle body; removing any idle vacuum problems; cause any problems? It would remove the need to remove the inlet manifold to change that stupid elbow. If i fit a oil catch can then the gunk shouldn't clog the air filter. Anyone ever done this?

 

You mean you would close the inlet pipes and there would be no ventilation at all?

That is like going back 40 years in time.

 

Thanks for the reply
There would still be ventilation from the airbox but on idle (when the oil separator PCV would normally be closed due to high vacuum on the engine side of the throttle body) any fumes would be drawn out of the crankcase once the throttle was open and the vacuum was equalised. The oil catcher can would separate the oil from the vapours so as not to contaminate the air filter. Normally when the engine is idling and the vacuum is keeping the central PCV closed, the only ventilation the crankcase gets is through the rocker boxes PCVs and this idea of taking the vacuum feed from the low pressure side would mean that when idling the central PCV is open, hence the need for the catch can. This system is sometimes used on high output engines and reduces the amount of crap getting into the valve train. I wouldn't normally consider this but as some brain damaged engineer decided that it's necessary to strip the entire induction system of an engine just to change a poxy rubber elbow.

 

Is this a pre-2002.5MY engine?

(Usually, before VIN M45255)

 

Yes, it's a 1999 3.0l, a Ford that thinks it's a Jag

 

Only that era has that hose i.e. they redesigned it.

On the plus side you can probably just replace the hose once and the car will be gone by the next time it would be needed.

 

Thanks for that Jag V8,
I probably will change it, mainly because I want to change the plugs as well but one aspect of this crap design is that if that central PCV ever fails then there will be a massive vacuum leak. No wonder they redesigned it

 

You're worrying (mostly) about the wrong sources of leak.

But... it's nearly 20 yrs old. It's gonna need some repairs!

 

You're not wrong, I have just had to euthanize my 94 4.0l XJ40 Sovereign after 7 years of almost constant repairs(it's now an organ donor) so I am well aware of the old saying 'don't buy a Jag if you can't take a joke' I did think that owning a heavily disguised Ford Mondeo (S Type) would allow me to hang up my spanners but hey ho, here we go again.
thanks again for your input

 

You mean X-Type. The S-Type is a LOT different!

Actually, the X-Type is a lot different but the S-Type is a whole lot more different again.

(By way of example, the Mondeo does not even have a 3.0 automatic option. Let alone a 4.2 whether NA or SC.)

 

I bow to your superior knowledge but prior to me buying this one, I worked on my son-in-laws' S type and found the Ford logo on some of the bits; I spent the next couple of months in therapy. All those times I ripped the proverbial out of S type owners has come back to haunt me (you have no idea how difficult it is to drive around with a paper bag on your head) but my therapist tells me I must persist. At least now, thanks to you, I can divert my snobbery at X type owners.
Thanks again

 

There are parts used by BMW, Audi etc as well most likely.

Ford don't make them anyway, generally - no car maker does. They're made by all sorts of companies (many in China). They stick a Ford logo on if asked to.

The car isn't German but the (lousy) DCCV is generally a Bosch part...

 

The S-type is in fact sibling to the Ford Lincoln LS.

Anyhow, I am grateful to Jaguar. Before the S-type I had owned several cars and spent decades without knowing anything about things like vacuum hoses, ignition coils, suspension bushes. I did not even know what an anti-roll bar is. Now I am a wise man. Also stupid.

 

If you listen carefully, that tinkling noise you can hear is the sound of my shattered dreams. Way back in the fifties, I was once seriously chastised by my mother for drooling on our Doctors Mk10 Jaguar, a huge machine of outstanding beauty. Ever since then I have followed the rise of jaguar (even the XJS) and I always envisioned that these cars were made by two old men, hitting bits of metal in a shed. Now you tell me that these cars are contaminated by bits from the lower orders, all my therapy was wasted, the voices are back! Now I understand why my XJ40 let me down, I bought the S type to keep the it's mileage down but instead it died of shame. I will now soldier on with my S type; a fitting punishment for my crime.
I am going outside, I maybe some time.........

 

Whilst contemplating additional therapy sessions, remember to change the cam cover gaskets and spark plug boss seals along with the upper and lower breather hoses.



If they haven't already been swapped out, replace the IMT o-rings with the updated green versions.

 

Thanks for the advice. As I have to practically disembowel the engine just to change a bit of rubber pipe (which incidentally, with packaging etc, cost me £20) I might as well renew the lot. Apparently it is possible to survive with just one kidney, so the cost shouldn't be a problem. I can't help thinking that somewhere in scrapyard in the wilds of China, there is the remains of a XJ40 quietly giggling to it's self.
Thanks again

 

Be sure to get the correct upper and lower inlet manifold gaskets as they are VIN-specific.


Twenty quid seems a bit much for the breather elbow. SNG Barratt, one of forum sponsors, has it (XR845730) for £14.26 including VAT.

 

Thanks, I see that the VIN is critical for ordering bits and they are on the way. in the meantime I've gone ahead and disconnected the vacuum feed to the dodgy elbow and it now runs like a dream. So far nothing has blown up and I haven't gassed any wildlife, yet. the oil catcher can is working fine exhausting into the air box but I know i'll have to bite the bullet and do a proper job.
thanks for the advice, again

 

Especially if you want to pass the next MoT.