Vacuum Schematic
#3
EDIT, Deleted info and note to self: Pls engage brain before keyboard .,........
According to my info the basic system even for '94 onwards is still Delanair Mk III. Still four vac solenoids (same as before) So the Mk III vac diagrams "should" still be valid.
According to my info the basic system even for '94 onwards is still Delanair Mk III. Still four vac solenoids (same as before) So the Mk III vac diagrams "should" still be valid.
Last edited by Per; 10-27-2012 at 05:49 AM.
#4
#5
Well there are two parts to the system on the '88 and earlier cars.
If you want to look at the vacuum advance for Lucas advance cars, here is a good treatise on it. You are probably looking at a "Emission A" system:
http://www.jagweb.com/aj6eng/vacuum.php
Here is a decent description and photos of what all those little parts are:
http://www.jag-lovers.org/xj-s/book/...omponents.html
For the other half of the system check out this page and click on the links to see vacuum routing diagrams for the various years. Look for the diagrams with the 'charcoal' and fuel pressure system.
http://jaguar.professional.org/vacuum/
Sounds like it is pretty common for the charcoal side of the system to be plumbed wrong, which will result in your fuel tank not venting properly. The rochester valve seems very finicky, so I just bypassed mine and vented straight to the canister. For the advance half of the system, I discovered my vacuum regulator was not connected properly, resulting in no vacuum advance at idle and crappy gas mileage. Now I have slightly less crappy gas mileage (9 mpg to 13 mpg in the city... so I guess that's actually about a 50% improverment).
Cheers,
- Will
If you want to look at the vacuum advance for Lucas advance cars, here is a good treatise on it. You are probably looking at a "Emission A" system:
http://www.jagweb.com/aj6eng/vacuum.php
Here is a decent description and photos of what all those little parts are:
http://www.jag-lovers.org/xj-s/book/...omponents.html
For the other half of the system check out this page and click on the links to see vacuum routing diagrams for the various years. Look for the diagrams with the 'charcoal' and fuel pressure system.
http://jaguar.professional.org/vacuum/
Sounds like it is pretty common for the charcoal side of the system to be plumbed wrong, which will result in your fuel tank not venting properly. The rochester valve seems very finicky, so I just bypassed mine and vented straight to the canister. For the advance half of the system, I discovered my vacuum regulator was not connected properly, resulting in no vacuum advance at idle and crappy gas mileage. Now I have slightly less crappy gas mileage (9 mpg to 13 mpg in the city... so I guess that's actually about a 50% improverment).
Cheers,
- Will
Last edited by macboots; 10-28-2012 at 06:46 PM.
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