[xj] vacuum advance module (and exhaust comments)

OK, so The Cuckoo’s back from having its exhaust fitted and I know
you’re all breathlessly waiting for hear my front suspension
measurements. However, I’ve got no time for that right now because
the new exhaust means I can start tuning - so I set about replacing
everything I could lay hands on today.

So, please someone tell me how you remove/replace a vacuum advance
module, preferably without removing the distributor from the engine?

In the meantime, let me tell you about the new exhaust. This is the
‘TT’ Torque Extractor model from AJ6 Engineering and it cost a small
fortune (three times as much as the car). I bought it because a
standard exhaust was only �250 cheaper and the AJ6 was clearly a
superior product. The key difference is in the front pipes; instead
of the front and back manifolds joining a foot or so below, these are
tuned pipes and join somewhere around the rear engine/gearbox
mounting. There are also no middle silencers. The system also comes
with a re-mapped ECU (included in the price) which I haven’t fitted
yet and I chose to have the ‘Super Enhanced’ option installed too for
an extra �170. You’ll have to read the AJ6 website for the technical
details on this but one key element is that the SE ECU ‘listens’ more
to the throttle pot and less to the manifold vacuum, and has a
sharper throttle response.

Bearing in mind I still had no definite idea of the state of tune of
the car, I did about 100 miles before pulling everything to bits to
fit my new engine parts - and the exhaust is already a revelation.
The noise (it’s obviously a good deal louder than a standard saloon
when you put your foot down) is - erm - fantastic. Reminiscent of an
E-Type. Accelerating away from roundabouts there’s a noticeable
difference, more like a kick in the pants actually. At around 70-80
mph, acceleration doesn’t drop off at all. Instead, there seems to
be a ‘second wind’ starting at around 3,000 rpm compared to before
and the exhaust starts making this barking sound which you can also
feel through your feet. Intoxicating. I still haven’t fully floored
the throttle in this car yet.

Back to the driveway and my grimy fingers. I’m kind of doing a a
baseline set-up for the car, given I know nothing about its history.
I’m replacing:

plugs (GKN)
leads (Bosch)
distributor cap (Lucas)
rotor arm (Lucas)
coils (Ducelier)
air filters (K&N)

and resetting the throttle linkage, throttle potentioneter, timing
and so forth.

So far, I’ve had a sense of humour failure getting the bloody aircon
condenser out so I can get at 1A/1B and the throttle pedestal out to
get at 5A/5B and the oil warning light sender out to get at 6A.

I wanted to replace the vacuum advance module and I had my new Lucas
part in my hand but I couldn’t for the life of me see how to get the
old one out so I just confirmed it moved when I sucked on it and put
the cap back on.

I’ll do those suspension measurements next week and report
accordingly. It all matters even more now because the new exhaust
has removed another 1/2 inch from my ground clearance!

Justin–
Justin Hill, Surrey UK
Jaguar XJ12 HE 1982 “The Cuckoo”
@Justin_Hill1

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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// please trim quoted text to context only

Justin, pardon me, but taking a tape measure to your front wheels, fenders &
lights takes less time than you did writing this email! Why are you
procrastinating about something as important as suspension settings? C’mon,
snap to it.
:]–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

Justin Hill wrote:

OK, so The Cuckoo’s back from having its exhaust fitted and I know
you’re all breathlessly waiting for hear my front suspension
measurements. However, I’ve got no time for that right now because the
new exhaust means I can start tuning - so I set about replacing
everything I could lay hands on today.

So, please someone tell me how you remove/replace a vacuum advance
module, preferably without removing the distributor from the engine?

In the meantime, let me tell you about the new exhaust. This is the
‘TT’ Torque Extractor model from AJ6 Engineering and it cost a small
fortune (three times as much as the car). I bought it because a
standard exhaust was only �250 cheaper and the AJ6 was clearly a
superior product. The key difference is in the front pipes; instead of
the front and back manifolds joining a foot or so below, these are
tuned pipes and join somewhere around the rear engine/gearbox
mounting. There are also no middle silencers. The system also comes
with a re-mapped ECU (included in the price) which I haven’t fitted yet
and I chose to have the ‘Super Enhanced’ option installed too for an
extra �170. You’ll have to read the AJ6 website for the technical
details on this but one key element is that the SE ECU ‘listens’ more
to the throttle pot and less to the manifold vacuum, and has a sharper
throttle response.

Bearing in mind I still had no definite idea of the state of tune of
the car, I did about 100 miles before pulling everything to bits to fit
my new engine parts - and the exhaust is already a revelation. The
noise (it’s obviously a good deal louder than a standard saloon when
you put your foot down) is - erm - fantastic. Reminiscent of an
E-Type. Accelerating away from roundabouts there’s a noticeable
difference, more like a kick in the pants actually. At around 70-80
mph, acceleration doesn’t drop off at all. Instead, there seems to be
a ‘second wind’ starting at around 3,000 rpm compared to before and the
exhaust starts making this barking sound which you can also feel
through your feet. Intoxicating. I still haven’t fully floored the
throttle in this car yet.

Back to the driveway and my grimy fingers. I’m kind of doing a a
baseline set-up for the car, given I know nothing about its history.
I’m replacing:

plugs (GKN)
leads (Bosch)
distributor cap (Lucas)
rotor arm (Lucas)
coils (Ducelier)
air filters (K&N)

and resetting the throttle linkage, throttle potentioneter, timing and
so forth.

So far, I’ve had a sense of humour failure getting the bloody aircon
condenser out so I can get at 1A/1B and the throttle pedestal out to
get at 5A/5B and the oil warning light sender out to get at 6A.

I wanted to replace the vacuum advance module and I had my new Lucas
part in my hand but I couldn’t for the life of me see how to get the
old one out so I just confirmed it moved when I sucked on it and put
the cap back on.

I’ll do those suspension measurements next week and report
accordingly. It all matters even more now because the new exhaust has
removed another 1/2 inch from my ground clearance!

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to http://www.jag-lovers.org/cgi-bin/majordomo.

// please trim quoted text to context only

Ah yes. It would be pretty quick except that my driveway isn’t
level, and nor is anywhere in my road. I have to drive to a carpark
somewhere to do the measurements. The car’s working again now.

Justin–
Justin Hill, Surrey UK
Jaguar XJ12 HE 1982 “The Cuckoo”
@Justin_Hill1

On 4 Sep 2006, at 05:54, Cannara wrote:

taking a tape measure to your front wheels, fenders & lights takes
less time than you did writing this email!

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to http://www.jag-lovers.org/cgi-bin/majordomo.

// please trim quoted text to context only