Hello all,
I have a 1997 xj-6. I am getting code p0306 along with some others.
This problem seems to pop up after a bad rain storm. I’m guessing
it may be the coil on cylinder #6. Can anyone tell me how the
cylinders are numbered?
THanks,
Ray–
Ray…86 xj-6, 97 xj-6 vanden plas
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The cylinders are numbered 1 through 6 
(#1 is in front)
Cheers
Doug Dwyer
Longview Washington USA
1995 XJRFrom: “ray lyons” seatrain1@comcast.net
. Can anyone tell me how the
cylinders are numbered?
In reply to a message from Doug Dwyer sent Sun 26 May 2013:
Thanks Doug for your quick reply. I know Im going to sound dumb
here but what the hell. Im new to this COP ignition. Can you give
me a brief explanation how it works? Does each spark plug wire have
a coil at the boot where it fits on the plug? Is there a seperate
ignition coil in addition to the COPs? I look p parts and they talk
about a ignition coil for 300.00 and then the COPs for like 30.00
apiece.–
Ray…86 xj-6, 97 xj-6 vanden plas
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There are no spark plug wires at all. Each of the six coils has a long
rubber boot that fits onto the spark plug. Inside the rubber boot is a thin
rod about 2" long the serves as the connection between the coil and the
spark plug.
When you buy a coil it’ll come complete with the boot and thin rod. However,
you can also buy the boots individually…which perhaps is part of your
confusion.
Remove the coil cover (three torx head screws) and you’ll see the six coils
staring up at you. To remove a coil unplug the connector, use an 8mm wrench
or socket to remove the two coil screws, and then lift the coil straight up.
Then you’ll see for yourself and it’ll all make sense
If you buy el-cheapo replacement coils you’ll become very familiar with the
remove-and-replace operation.
Doug Dwyer
Longview Washington USA
1995 XJRFrom: “ray lyons” seatrain1@comcast.net
Does each spark plug wire have
a coil at the boot where it fits on the plug? Is there a seperate
ignition coil in addition to the COPs? I look p parts and they talk
about a ignition coil for 300.00 and then the COPs for like 30.00
apiece.
In reply to a message from Doug Dwyer sent Sun 26 May 2013:
Thanks so much Doug. I’ll let you know how I make out. Is it good
practice to replace all 6 coils? The scan tool is saying #6 is
misfiring. Can I replace just that one?
Thanks again
Ray–
Ray…86 xj-6, 97 xj-6 vanden plas
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Yes, you can replace just one.
I would not summarily replace all six. Why? First, there’s no need to. The
remaining five coils may soldier on for some time to come. Also, there’s
been difficulty in finding high quality replacement coils. If you happen to
get a dud brand then better that it be a single dud than six duds!
In a very brief nutshell…
The original coils used by Jaguar (Japanese made with a Lucas label) were
high quality. For a time we had identified a supplier for the very same
coils but the supply seems to have dried up. The confusion is compounded by
re-boxing and re-labeling of coils that seem to come from a unknown
manufacturers and are of unknown quality.
The last time I checked (about 15 months ago) buying a Jaguar-boxed coil
from Jaguar was a $400/each proposition. Thus the search for more
reasonably priced alternatives. And at this point I wouldn’t be confident
that buying a Jaguar-box coil guarantees you’ll be getting the same
original, high quality coil. Maybe so, maybe not. I don’t know of anyone who
wants to spend $400 just to find out
I would advise against buying a Beck Arnley coil. I have multiple failures
with these even though they appear to come from two different
manufacturers…or at least appear to have been subject to two different
manufacturing processes.
Cheers
Doug Dwyer
Longview Washington USA
1995 XJRFrom: “ray lyons” seatrain1@comcast.net
Thanks so much Doug. I’ll let you know how I make out. Is it good
practice to replace all 6 coils? The scan tool is saying #6 is
misfiring. Can I replace just that one?
In reply to a message from ray lyons sent Sun 26 May 2013:
I pulled it out. It had a hairline crack in the plastic body. Don’t
know if this would make it jump to ground and not fire the plug.
You almost make it sound worthwhile to get one from a junkyard that
is the original Lucas. With a little luck the owner of junkyard
won’t know what he’s got!
You have been a great help. This is my wife’s car…sounds crazy
but I’ll stick with my 86 xj-6. LOL
Ray–
Ray…86 xj-6, 97 xj-6 vanden plas
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In reply to a message from ray lyons sent Mon 27 May 2013:
Hey Doug,
I replaced #6 coil and all is well. All codes cleared. Thanks
again. Just one more question on the coils. Are they simple good or
bad or an they gradually fail?
Ray–
Ray…86 xj-6, 97 xj-6 vanden plas
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In reply to a message from ray lyons sent Tue 28 May 2013:
I had a failed coil in my XJ8, although the problem was
intermittent, it would only manifest itself after a run and
when the car was restarted after an hour or so later. After
5-30 minutes fine, next day fine but would misfire after 1-2
hours rest from warm with CEL and coil misfire code. So I
would say coil failure can sometimes be a gradual thing or
can occur under certain conditions perhaps leading to total
failure. Needless to say I replaced the coil (all 4 on the
same bank actually) and so far no problems.–
2000MY X308 4.0L
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