So the Jag runs fine but these codes come right back even after clearing them. I notice 2 open hoses in the engine bay by the intake but I dont see and hanging connecting pipes that would connect to them.

See Attachment - Any advise would be much appreciated.

 

Those are vacuum leak codes, and it sure looks like you have a vacuum leak.
Download the Service Manual on the X150 main page and try to find a diagram that looks similar.

Course, someone who already knows what this is will no undoubtedly be along soon and say what you need. I have the 5.0 so I have zero idea.

 

Thanks CJ. We have matching color Jags.

 

I don't have a 4.2 litre any more but judging by your photo you are looking in the area of the red circle. The workshop manual says to disconnect a vacuum hose when the supercharge outlet pipe is being removed so it looks like there should be something connected.

Hopefully someone with a 4.2 will be able to advise further.

 

I had a 4.2 litre but it was N/A not S/C so I offer this suggestion as a possibility only:


(double click on the image to enlarge it)

Perhaps missing/disconnected S/C secondary air injection vacuum hose item 11?

Graham

 

Two? Pic only shows one.

Here's a pic of the one in your attached image. It comes off the discharge side of the blower (top), splits in two at a Y (under the coolant passage) and feeds the pressure transducer (at my thumb) and a capped test port (where my finger is pointing).


There is a second capped fitting lower on the blower (under the coolant fill) but I think it's just a plug as I couldn't see a line coming off it. The parts should be there, no doubt under the heat exchanger hiding from you.

Assuming a big backfire out the throttle body popped them off. Anything odd happen before this?

 

Jaguar intake tract on both the XK and XKR is both long and complicated with many opportunities for vacuum leaks downstream of the MAF(s). I have found the best way to chase these leaks is through a "smoke test". Any good indy mechanic can do this. Cost to me was about $100. A smoke test will find the leaks!

 

What he said ^^^^

 

Ranchero -

That is the correct part. I cant quite see in your pic if the rubber elbow that comes of the gray plastic pipe from the transducer and then goes into the charger vac tip, or if there are more vac hoses involved. When I said 2 vac pipes it was in reference to the metal vac pipe in the charger and the gray plastic vac pipe. I posted another pic. BTW the car runs fine even though major vac leak. This happened after full throttle and blew the rubber elbow right off to the road some where.

Thanks!

 

Yep, it'a just a little acute angle rubber nipple / fitting doodad. The grey plastic part splits in two under the coolant pipe and goes to the other spots in my picture.

Since it feeds a pressure transducer for boosted conditions I don't know that I'd be pushing it too hard. Probably the best bet for a replacement is to scrounge some junk yards rooting through the same generation Fords. Might also find some in the Dorman section of your local Autozone. NAPA maybe as well. As you'll see, the nipple will slide off of the plastic tubing with a good bit of effort. I'm impressed it blew off. Gonna be a pain in the butt to get one back on. Recommend some decent needle nose pliers for the plastic part or try to fish it out and then fish it back in once assembled.

 

So long as it ends up 100% (not 99% or less) vacuum tight, so there are NO air leaks whatsoever, it'll be fine.

 

I'm impressed it blew off. Gonna be a pain in the butt to get one back on. Recommend some decent needle nose pliers for the plastic part or try to fish it out and then fish it back in once assembled.[/QUOTE]


Just a manufacturing tip, dip the tip of the hose in slightly diluted dish soap to slip it on the tube.

 

buy a lenght of flexible/rubber vacuum tube and slide it on.
I believe you'll need 4mm.


I replaced all the hard piping with rubber vacuum hose and got some metal Y-pieces

 

I did some of that ^^^ on a few spots. Works fine.

 

Thanks to this post I finally located the other end of the vac line, I noticed the pipe from the supercharger had snapped and could not locate the other end (some time ago) . Of course the pressure transducer connection piece snapped when trying to remove the broken piece. Now awaiting the JB weld to set and source some pipe tomorrow.

Thank you

 

That pipe is part no. 7 in the diagram above is not worth bodging, I t’s only £25 from Jag. The angled rubber boot that connects to the s/c swells and leaks when it gets older, he rest of it gets very brittle too.I had those codes flag until I replaced it.
I also did a smoke test and found the vacuum pipe from the brake booster was leaking where it goes into the throttle body heater. I also had to replace the induction T to throttle body connector, codes never returned.