While replacing spark plugs, I found this probe that was just laying behind the Throttle Body with 51-11-1 embossed on it. Sent the enclosed image to the Service Depart Manager of Jaguar Tulsa Oklahoma and he said; "It appears to be the intake air temp sensor, this is only on supercharged engines." If he is correct then why am I having such a difficult time figuring out where it should be plugged in? Refer to my attached image.

 

Looks like it's just meant to sit loose?

I found it in the parts catalogue it's listed as a "vacuum hose"



Could be a check valve or some other device for venting to atmosphere or ???

I don't remember seeing this on my engine...

 

I haven't seen anything like that on mine. The orange/black suggests a check valve, the part with a number looks like a cap but kinda goofy. My guess would be a vacuum line for something that your particular car doesn't use. It can't be a temp sensor if it's connected to a vacuum line. If it were an intake temp sensor it would have to be in the intake and without it in there would be a monstrous vacuum leak that wouldn't go undetected. I vote it an 'extra' that may be connected to something in other vehicles or for an option that you don't have, happens mostly with extra electrical connectors, but also with hoses. In my short time of researching stuff about the STR I've found numerous inconsistencies. At first I assumed they were modifications done along the way by owners or mechanics, but I'm swayed heavily towards Jag having done inconsistent stuff. Some inconsistencies appear to be changes made throughout a build year, but there are a few things I've found that indicate they might use parts a bit *****-nilly throughout production as well as different stuff depending on the destined market for the car.

 

The same hose is listed for the X350 XJ and XF SV8 (same engine as STR) and has the exact same drawing.

Looking at the photos again, it does appear to be a check valve, but also the rubber cap part with the 51-11-1 on it is how it's meant to be.

Perhaps this vacuum line is only meant to be used for diagnosis purposes? To put a pressure gauge on? Who knows...

But either way, I definitely would not worry about it one little bit, tuck it out of the way so it can't touch anything hot, and move on.

 

Interesting but my 2005 STR has nothing like that either. It is in the area of the IAT sitting right above it.

Hard to see the IAT unless you are back there doing some work.

Here is a picture of where it's mounted. On the back of the engine on the passenger side.

https://www.jaguarforums.com/forum/a...1&d=1445018880
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Saw this in
jaghelp.com: 2006 S-type supercharger removal
So I'm not going worry about it anymore. However I would like to know what It's fundtion is.

 

Could it be for Secondary Air as the vapors from the Emission Control Circuit are fed into the intake air for burning? Not required in US market.

 

SAIR is something else (air into exhaust). You perhaps mean EVAP.

To identify it, figure what it connects to and then hunt around parts catalogue / workshop manual - both free downloads - or online parts cat.

 

I would like to know to.
Please post back if anyone finds out what it does.
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Guys,
I believe Cambo is on the right path with this one. I believe this is the diagnostic port for measuring the supercharger pressure. Similar to 2008 XKR I'm doing prototype work on. The hard lines are typically vacuum lines or pressure lines. This would route to the supercharger hat on the XKR's. With the different layout of the S types, there may be a port on the discharge side of the supercharger that this routes to.
I have my setup plumbed out to a 3bar map then routed to my DAQ unit for logging boost pressure.
See in Ragn0r's photo , the hard line that is on the drivers side of the discharge hat location.


Regards,
Derek Fricke

 

Well there is a port that already measurers the blower pressure. It's hooked up to your fuel pressure sensor. Maybe that vacuum hose is connected to this port?


https://www.jaguarforums.com/forum/a...1&d=1445448730
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This capped hose is shown in the parts catalog for the naturally aspirated V8 engines too.

Don't worry about it....

 

Thank you for the image.
Is this piece on a 4.2l supercharged engine?

 

Yes, it's the STR.

 

JagV8 beat me to it!

Since it's on the NA too it is a puzzle?
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Where is this piece on the 2007 4.2l Supercharged engine?

 

Same place...