A heater hose leak project involved the removal of the supercharger. It is all back together, no leaks, no codes, but with a rough idle.

LOOKING BACK, I realized I may have made a mistake, but I cannot find any references to it in JTIS or the forum to confirm.

There is a vacuum hose connection on the throttle body elbow, left/driver side, that runs to the EVAP purge valve on the fire wall. The hose comes into the TB elbow with a right angle bend, but has a short 4 or 5 inch tube off that. I put the vacuum hose right angle into the TB elbow vacuum connector, but did NOT plug that small hose into anything. I just spaced it out...

Anybody know where that vacuum line goes? For the life of me, I can't recall... I don't remember unplugging it from anything, but the memory is suspect at this point.

EDIT: I got some starter fluid and sprayed it back near the location of the un-terminated hose, and it definitely cures the problem with increased rpm and smoother idle. I still have no idea where the hose should terminate, but it appears the throttle body will be coming back off soon.

Would really appreciate some help!

Thanks

 

Michael
Here is a JPEG file with 2 illustrations and instructions I extracted from the JTIS software - 1999 model year and XJ model selection; Intake Air Distribution and Filtration; Removable and Installation; Supercharge Outlet Pipe (Click on the webpage image after the webpage opens to get a sharper image):

https://www.dropbox.com/s/oocnu7z3s3...Connection.jpg

The reason I picked the 2 Outlet Duct Images is that the first one shows the Duct without the vaccum hose and the 2nd shows it with the vaccum hose attached.

Jim Lombardi

 

Thanks, Jim, but I needed the inlet side.

Found the missing nipple hanging down from the supercharger cooler. Did a little dis assembly, slid the loose hose on, buttoned her up and all is well. Amazing what one little vacuum line can do. And the heater hoses under the supercharger are new and leak-less. The Cat is purring again!

I could not find this vacuum connection documented in any of the procedures, and I looked hard. It was a bit devious, as you could not see the nipple from above and other angles. It was upside down. Sly.

Feels good to have another project done on the Jag. Couldn't have done it without this site... Pretty cool!

 

My car has a decal above the radiator grill which shows vacuum routing.