[xj] XJR N/A powered Ser II

I’ve been working on this car for awhile now and today I
could finally take it for a spin. It’s a 1974 SWB Ser II
that had a dead engine. I installed a 1991 XJ40 4.0 litre
XJR engine and ZF 4hp22 transmission. Despite it still
running off a 3.6 ECU and AFM this is a rocketship:) The
noise is very nice as well. Now it;'s final detailing and
finding out why it’s hunting at idle (probably something
small). I hope the owner will be as pleased as I am;)

cheers,–
Arnoud
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In reply to a message from Arnoud sent Wed 20 Feb 2008:

Arnoud:

That sounds like a lot of car and a lot of fun!

Perhaps the ECU is receiving signals it is not accustomed to and is
seeking to find a happy ground!

Good work!

Carl–
The original message included these comments:

I’ve been working on this car for awhile now and today I
could finally take it for a spin. It’s a 1974 SWB Ser II
that had a dead engine. I installed a 1991 XJ40 4.0 litre
XJR engine and ZF 4hp22 transmission. Despite it still
running off a 3.6 ECU and AFM this is a rocketship:) The
noise is very nice as well. Now it;'s final detailing and
finding out why it’s hunting at idle (probably something
small). I hope the owner will be as pleased as I am;)


Carl Hutchins
Walnut Creek, California, United States
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In reply to a message from Arnoud sent Wed 20 Feb 2008:

Hi Arnoud,

Same here…
I started the AJ6 3,6l engine in my Ser II yesterday for the first
time after replacing. All seems fine except for the idle speed>
cilinder #3 is not running. The injector is not receiving the
data/pulse it should get.

A relative has got the same problem with the 3d cilinder on his Ser
II, so that’s why I assumed it has to do with the ECU in
combination with a speed sensor pulse, a fuel detection pulse or
the automatic gearbox switch.

Do you have any idea what this could be?

Regards,

Frans–
laserman
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In reply to a message from cadjag sent Wed 20 Feb 2008:

Hi Carl,

I found out that the idle speed valve didn’t work, nor did a
replacement. Too much air came in which caused the funny
idle. I ‘‘solved’’ it by blocking the airway and adjusting the
butterfly itself; it’s now idling at a steady 700rpm. You
should hear this thing when under full power at 6k rpm;
quite impressive:) I haven’t checked smog levels but it
seems to be running just fine off a 3.6 ECU and ditto AFM (I
found that I could not connect a 4.0 ECU to a 3.6 wiring
harness, so it’ll have to make do with this stuff;)
Meanwhile I found out that my Coupe runs 3 km per litre of
LPG, which is rather unimpressive, so that’s next on the to
do list;)–
Arnoud
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In reply to a message from Arnoud sent Sun 24 Feb 2008:

The early versions of the 3.6 engine were famous for having erratic
idle and hunting on the overrun once they had a few miles on them,
with the latter at least due to not pulling enough vacuum. Roger
Bywater offers an ECU fix for that apsect at least.–
66 2+2, 73 OTS, 76 DD6 Coup�, 93 XJ12
Cambridge, United Kingdom
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In reply to a message from laserman sent Sun 24 Feb 2008:

Hi,

So you don’t measure any voltage at the connector? Since
they’re wired in pairs I’d expect #4 to do the same as #3
unless you have a broken wire. Have you removed the injector
for testing?
The only downside to my ‘‘solution’’ (ie. blocking off the
ISCV) for the idle speed is that cold starts are a bit more
difficult (takes 3 or 4 attempts), but once it runs idle’s
perfect at 600, 800 when warmed up.
A 3.6 only has the crank sensor and the TPS as an input (I
unplugged the TPS when I had the high idle and instantly it
revved to 4k or so, telling me that the sensor worked;); the
gearbox is basically stand alone.–
The original message included these comments:

I started the AJ6 3,6l engine in my Ser II yesterday for the first
time after replacing. All seems fine except for the idle speed>
cilinder #3 is not running. The injector is not receiving the


Arnoud
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In reply to a message from Arnoud sent Mon 25 Feb 2008:

Hi Arnoud,

The scope gives the same signals for every connection. Probably one
connector is broken although it measures 2.4 Ohms, same as the
others.

How can connectors be measured/tested in a way when taken out as
you mention?

best regards,

Frans–
laserman
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