Hi All
Have had all 3 of these symptoms recently.Happens intermittently,I
get blue smoke out of the exhausts after I coast for a long way and
then re apply the throttle e.g leaving a motorway.
Passenger side bank of cylinders have been running rich
intermittently - coincides with the engine running rough as
well.Feels like a mis fire and has difficulty puling up
inclines.Have taken it to a jag specialist (very good by the way
please contact me off line if you wish to know and live in the
midlands area).When hooked up to the computer no error codes are
shown - this has happened twice and the engine management light has
not shown.
I am baffled,fuel consumption goes through the roof when it runs
rough and it is not burning oil - not that I can detect
anyway.Also get clouds of black soot from the passenger side
exhaust - obviously rich mixture.Any ideas would help,lambda
sensor? O2 sensors?decaying Cat? software glich?
X308 XJR 144000K 1998 - yes its a Nikasil!–
Aran
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In reply to a message from Aran sent Wed 10 Sep 2008:
I hope I’m wrong but I do think indeed it could be a Nikasil
failure.
The reason you see blue smoke after coasting is because when you
are under throttle the high cylinder pressure could be slipping
down against the cylinder wall hence keeping oil out. However, when
you coast the pressure is less and the oil works it’s way in?
Just a theory.–
AJ16er
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In reply to a message from Aran sent Wed 10 Sep 2008:
Hi Aran,
If you are concerned because it’s a Nikasil engine, the first thing
I would have done is a ‘blow by’ test to settle once and for all
that your engine is not loosing compression.
The supercharged models run at a lower compression rate than the
standard N/A V8.
Blue smoke on the overun definately sounds like worn bores or rings
but you say you are not consuming oil??
The extra richness on the left bank of cylinders could be down to
firstly the MAF meter or it’s sensor, followed by the O2 sensors
mounted on the left cat. (check whether you have ‘upstream’
and ‘downstream’ sensors.
Your Jaguar ‘specilaist’ should be able to pick all this up anyway.
I would also be checking the wiring harnesses for both the left
hand coil packs and left hand injectors and all their associated
connectors, as these wires are subject to a lot of heat and it’s
possible to suffer a fractured wire.
Use CRC Contact cleaner and Lubricant to clean all connectors.
Check and clean all the earthing systems and their connections.
If it was a clogged fuel filter, it would effect the entire engine.
same goes for the thottle body.
I would be pulling the coils and the plugs to check their condition.
Lastly the ECU condition and it’s associated connections should be
checked.
These are a sofisticated system and if anything is wrong here, it
would show on the diagnostic equipment…if it’s any good that is
and is compatible with the Jaguar system.
Some one else will chime in with further possibilities. :^))
Cheers,
MaxH–
The original message included these comments:
Passenger side bank of cylinders have been running rich
I am baffled,fuel consumption goes through the roof when it runs
rough and it is not burning oil - not that I can detect
anyway.Also get clouds of black soot from the passenger side
exhaust - obviously rich mixture.Any ideas would help,lambda
sensor? O2 sensors?decaying Cat? software glich?
X308 XJR 144000K 1998 - yes its a Nikasil!
Aran
–
Max Heazlewood '98 XJ8 4ltr. Sapphire Blue, Ivory/Oatmeal
Tasmania, Australia
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In reply to a message from Aran sent Wed 10 Sep 2008:
Yes, leak down test would be my first priority. However in the
meantime, check the air filter housing and induction pipes for oil.
IMHO minimise using the car, if it is proved to be NIKASIL failure
you have caught it in time hopefully to possibly trade the car, of
course making it clear to any dealer the problem…
Jamie–
The original message included these comments:
well.Feels like a mis fire and has difficulty puling up
inclines.Have taken it to a jag specialist (very good by the way
X308 XJR 144000K 1998 - yes its a Nikasil!
–
http://www.iecd.co.uk/ScratchPad/jaguar_pages.htm
Newtown, Powys, United Kingdom
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In reply to a message from Aran sent Wed 10 Sep 2008:
If it passes the compression test, I would clear the part
breather, this plugs easily and pressurizes the crankcase at low
throttle openings, forcing oil into the cylinders. This oil could
cause misfiring as well.–
Brian Caro 96XJ6 4.0 63E-TypeS1FHC 05 XJ8 4.2
Newport News, VA, United States
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In reply to a message from Brian Caro sent Thu 11 Sep 2008:
Should have mentioned, this could also be a bad O2 sensor, I
suggest getting the computer scanned in real time to check the
sensor values to find any out of range. Before diving into the
expensive world of engine management, a scan is good preparation.–
Brian Caro 96XJ6 4.0 63E-TypeS1FHC 05 XJ8 4.2
Newport News, VA, United States
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In reply to a message from Brian Caro sent Thu 11 Sep 2008:
Hi Brian
I thought that if the 02 sensor goes out of standard range, the ecu
detects this situation, open loops with substitute best guess
values for both banks (in the case of V8, V12 or V6). However I
have no specific experience on the Jaguar V8 with this.
I would assume emissions may vary, but not to get anything like
this loss of power or smoke. In fact the car runs open loop when
getting up to temperature anyway, and could do all day long apart
from its emission control would not be that good.
Cheers
Jamie–
The original message included these comments:
Should have mentioned, this could also be a bad O2 sensor, I
–
http://www.iecd.co.uk/ScratchPad/jaguar_pages.htm
Newtown, Powys, United Kingdom
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In reply to a message from Aran sent Wed 10 Sep 2008:
Hi Aran -
Have experienced a very similar thing with my 99 XJR on a
couple of occasions. when yours occurred did your left
tailpipe go very sooty ?.
I feel it is NOT a Nikasil matter but one of fuel supply. My
incidences occurred after cleaning the K&N filter and a
succession of short runs (car warm but only travelled 3 or 4
miles between starts) - seems to phase it somehow.
Concerning but it sorted itself out and has done it for a
year - and car still running fine and in daily use.
Regards
Laurence–
grunt61
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In reply to a message from grunt61 sent Thu 11 Sep 2008:
Many thanks gents - sorry for the late reply as I have been out of
the country.Had a blow by test 40K miles ago whwn I bought the car
and was registering 19L/min.Have always put good quality oil an
petrol in and never do short runs - my daily commute is 25 miles
mainly on the motorway.Oil consumption is about 1/2 litre of Mobil
1 every 2000 miles.Have suspected the O2 sensors and MAF meter (Jag
specialist also suspects these as too the cat on the left bank may
be on its way out.)I too have suspected the connectors - as it all
started after I checked the oil,the dip stick is close to the
connector for that bank.Jag specialist tested the car both
staionary and also in real time an it showed no faults.Have left
the battery diconnected for the last 5 days whilst out of the
country and reconnected today - all working fine today.Just also to
reply to Laurence - yes my left tailpipe is like a chimney - in
fact the boot is covered with soot!
Will keep you all posted on what happens next.will pull the
breathers at the weekend and have a look at these.
Many thanks again–
The original message included these comments:
Have experienced a very similar thing with my 99 XJR on a
couple of occasions. when yours occurred did your left
tailpipe go very sooty ?.
–
Aran
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In reply to a message from Aran sent Tue 16 Sep 2008:
Aran,
Did you ever get any resolution to this?–
1999 XJR
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In reply to a message from Shotime sent Wed 1 Oct 2008:
im having the same problems with my xj6 3.2. it is driving me up
the wall. it started as a slight misfire and now has escalated into
a very rough ride, engine noise bubbling. I have recently emptied
my radiator and refilled with fresh anti freeze solution, and
topped up my oil. also as well I have cleaned my air filter, which
someone has mentioned in the forum, any connections?? my son thinks
its the spark plugs that need replacing, I suspect it is something
else, probably more expensive!!! where do I start before getting it
looked at and getting a hefty bill?–
paul31
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Paul,
Coolant condition and oil level would have very little to do with an engine
running rough. It has to be something relating to fueling or ignition. The
air cleaner change is a little closer to the mark, but only if it was
severely clogged.
Fueling involves the fuel pump, fuel filter, fuel pressure, and injectors.
The first three would result in a lean condition and you’d get a check
engine code. The last one just messes up the fuel burn, but there’s nothing
there you can look at.
It’s more likely ignition, which involves plugs, coils, voltages, spark
leaks through cracks in the coils, the crank position sensor, the cam
position sensor, the ecu, coolant sensors, O2 sensors, and probably a bunch
of other things I’m not thinking of right now. In modern cars, you really
need a code reader to know where to start. If your check engine light is on,
there’s definitely a code. If not there can still be a code that hasn’t
risen to the threshold of setting the light.
AutoZone in the U.S. will read codes for you. Someone will probably let you
know if someone over there offers free readings. Jag-Lovers has a list of
all the diagnostic codes available to donors at
http://www.jag-lovers.org/obd.php.
Once you get the codes, there’s probably going to be lots in the forum
archives indicating the problem and fix.
That’s where you start.
“Mark 1” Mark Stephenson Phoenix, AZ, USA
'52 XK120 S673129, '59 Mk1, '84,'85,'86 &'95 XJ6
where do I start before getting it
looked at and getting a hefty bill?–
paul31
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In reply to a message from Mark Stephenson sent Wed 3 Dec 2008:
thanks mark, that info is useful. I intend to take it to local
dealer for a full service. the engine light not on yet. do you
think I should check all my fuses for ecu, o2 sensors etc. before I
do take it in? I started yesterday checking all fuse connections.–
The original message included these comments:
That’s where you start.
–
paul31
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Paul,
I don’t think so. If there was a blown fuse that controlled spark, you
wouldn’t be running at all. The fact that it grew progressively worse is
another indication that it’s probably not a fuse or any on-off sort of
thing. If it’s running as badly as you say, there could be a code that will
point us in the right direction.
“Mark 1” Mark Stephenson Phoenix, AZ, USA
'52 XK120 S673129, '59 Mk1, '84,'85,'86 &'95 XJ6-----Original Message-----
From: owner-x300@jag-lovers.org [mailto:owner-x300@jag-lovers.org] On Behalf
Of paul31
Sent: Thursday, December 04, 2008 5:04 AM
To: x300@jag-lovers.org
Subject: RE: [x300] Blue smoke,rich running on one bank and running rough
In reply to a message from Mark Stephenson sent Wed 3 Dec 2008:
thanks mark, that info is useful. I intend to take it to local
dealer for a full service. the engine light not on yet. do you
think I should check all my fuses for ecu, o2 sensors etc. before I
do take it in? I started yesterday checking all fuse connections.
The original message included these comments:
That’s where you start.
–
paul31
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In reply to a message from paul31 sent Wed 3 Dec 2008:
Dear Paul,
When the radiator went empty, what happened to the engine?
It might be head gasket failure, if the engine experienced
overheating.–
Momo (or 100 when written in Japanese Kanji), '98 4.0 XJ8 L
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In reply to a message from 100 sent Thu 4 Dec 2008:
hi…there was no over heating on the radiator, I changed the
antifreeze because of the very cold weather were having here at the
moment. I completely drained the radiator, flushed with fresh water
then topped it up to the max mark with a water - antifreeze
solution, I drove it for 3 miles came back and topped it back up.
The oil and temperature gauge both ok on the car. I have noticed
however im getting 15 miles per gallon, I was usually running on
about 24 mile per gallon. I also noiced today that when I turn my
ignition off the petrol gauge rises slightly. Its never done this
before…
Paul–
paul31
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In reply to a message from paul31 sent Thu 4 Dec 2008:
Dear Paul,
Oh, I see. For some reasons, I thought the car lost coolant
while it was running. You emptied to change the coolant…
It was my mistake. Please forget what I said.–
Momo (or 100 when written in Japanese Kanji), '98 4.0 XJ8 L
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