[xk8] hesitation and engine warning light

XK8
1

Listers,
Help please. Dad is having problems with his 1998 XK8. Problem is
relatively new but repeatable as long as the initial leg of a
journey is long enough. Car has only 30K miles, as it is an
occasional driver. Has had the 30K service. problem is that after
a 40 mile trip with no problems, the return home some short time
(15 mins) later, results in very poor runing and, in particular,
hesitation and the engine warning light comes on.
The dealer seems stumped. Is it a CPU problem…? Anyone had this
happen?
Thank you
Iain–
1966 3.8 S-Type
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2

First you need to find the code the engine is throwing. If you are in the
US take it to an Autozone and get them to pull the code.

-Chris

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3

In reply to a message from Chris M sent Thu 3 Aug 2006:

Yes, the OBDII code would for sure be of great help here.

But it could be be the Throttle body, which was a weak point
on the first generation XK8s. Was it reprogrammed/replaced
(depends on the VIN)?

There is a TSB for that: normally the Jag dealer should do
it for free as soon as a non-modified car enters its
premisses whatever the age of the car is.(The TSB blinks in
red on the VIN car history, on their computer screen: they
cannot miss it ;-)–
Charles_3000
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4

In reply to a message from Charles_3000 sent Thu 3 Aug 2006:

The throttle body recall was for Vin numbers 18108 to 20807.
It was R/1998/015 dated 6/2/1998. See the UK VOSA recalls
website. Good luck.–
The original message included these comments:

But it could be be the Throttle body, which was a weak point
on the first generation XK8s. Was it reprogrammed/replaced
(depends on the VIN)?
There is a TSB for that: normally the Jag dealer should do
it for free as soon as a non-modified car enters its
premisses whatever the age of the car is.(The TSB blinks in
red on the VIN car history, on their computer screen: they

–
Brian Mellor 1998S XK8 Topaz Coupe 76K miles
Surrey, United Kingdom
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5

In reply to a message from Brian Mellor sent Thu 3 Aug 2006:

Brian, are you sure of your VIN numbers? I have different figures:

Here’s what I have:.----------------------------------------------------
Service action S514 was issued to UK dealers in May 2004:-

Model: XK Series N/A vehicles
Model Year: 1997 to 1998
VIN Range: 001036 to 031302

Model: XK Series SC vehicles
Model Year: 1998.75 to 1999
VIN Range: 024695 to 042775

Model: V8 XJ Series N/A vehicles
Model Year: 1998
VIN Range: 812256 to 853935

Model: V8 XJ Series SC vehicles
Model Year: 1998 to 1999
VIN Range: 812256 to 878717

Dear Colleagues
A concern has been identified with the throttle operation on a
number of vehicles in the above VIN range. Under exceptional
circumstances this concern could cause the engine to cut out,
although the engine will continue to be driven by the road wheels
through the transmission and drive the ancillaries, so there will be
no loss of power steering, brakes, air conditioning, etc. The engine
should restart without difficulty once the vehicle has come to a
complete standstill.

Action to be taken:

To aid in the identification of repairs required by vehicle, Table
1 of this Service Action provides a breakdown of the repair required
by model year, model description, and VIN range.

For those vehicles that require the ECM to be reprogrammed,
Worldwide Diagnostic System (WDS) release JTP759/31, or later,
should be used.

Model Year Model Description VIN Range Repair Required:

1997 to 1998 XK Series N/A 001036 to 020734 Reprogram ECM
1998 V8 XJ Series (both N/A and SC) 812256 to 819771 Reprogram ECM
1998 XK Series N/A 020735 to 031302 Replace throttle body
1998.75 to 1999 XK Series (SC) 024695 to 042775 Replace TB
1998 V8 XJ Series N/A only 819772 to 853935 Replace throttle body
1998 to 1999 V8 XJ Series SC only 819772 to 878717 Replace TB

–
Charles_3000
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6

In reply to a message from Charles_3000 sent Thu 3 Aug 2006:

Charles,
I’ve also got a copy of S514 which agrees with your data.
I was just quoting the UK Vehicle & Operator Services Agency
website which lists all the UK government mandated recalls
for all manufacturers. The manufacturers also do recalls
that are not mandated.

I’ve had S514 done to my car and also R466C(secure throttle
body), and S474P(clean part load breather). My VIN is 19350.

Regards–
The original message included these comments:

Brian, are you sure of your VIN numbers? I have different figures:
Service action S514 was issued to UK dealers in May 2004:-

–
Brian Mellor 1998S XK8 Topaz Coupe 76K miles
Surrey, United Kingdom
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7

In reply to a message from Brian Mellor sent Thu 3 Aug 2006:

Ok, this explains that :-). Could you maybe post the S474P here or
mail it to me?

Many thanks,

TC–
Charles_3000
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8

In reply to a message from Charles_3000 sent Thu 3 Aug 2006:

Charles,

I’m sorry I don’t have any detail on S474P. I just have the
Jaguar warranty printout which shows that S474P was
performed on my car on 26/7/04 by Guy Salmon Jaguar and
covered Clean part load breather. They also did
S479M(reprogram ECM 60k mile service) and S514B(reprogram
ECM) at the same time. This was when the dealer had it for
the 60k mile service.

Regards–
The original message included these comments:

Ok, this explains that :-). Could you maybe post the S474P here or
mail it to me?

–
Brian Mellor 1998S XK8 Topaz Coupe 76K miles
Surrey, United Kingdom
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9

In reply to a message from Brian Mellor sent Fri 4 Aug 2006:

Ok, I understand. Thanks for checking.

TC–
Charles_3000
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10

Here’s a procedure for cleaning the part load breather and throttle body
on my 97, which I’ve been sharing on another XK8 forum for a while…

The Part Load breather is a tube at the front, left cam cover just on
the edge of the engine cover (that says “Jaguar”). The tube is about
5/8" diameter I guess. You’ll want to remove the engine cover to get
better access for your fingers. Squeeze the plastic O-ring that forms
the clip and pull. It will give some hesitation but should come off.
Basically this O-ring is a plastic clip and by squeezing it you are
making it more into an oval. Be careful though as by now the plastic is
getting brittle. Also, there may be different clip styles as the cars
go through minor changes. To clean the part-load breather, take a small
paperclip and straighten one end of it out, or use a 3/32" drill bit.
If using a drill bit, put a wrap of tape on the end or use a bit-vise to
ensure it won’t fall into the engine. Push it into the breather (which
is still in the cam cover) and push until you break free of any gunk.
That’s it for the part-load breather.

For the throttle body - it is attached to the back of the engine, at the
firewall. The big black ABS plastic ducting that carries air from the
air filter (near the front right corner of the engine compartment) back
to the throttle body must be removed. You’ll need to disconnect the
full-load breather tube from the right cam cover (about 1 1/4" diameter
tube I think), which goes from the right cam cover to the plastic
ducting. There’s an O-ring clip there on the cam cover. You’ll need to
remove the bolts that hold the air duct to the throttle body, there are
2 of them and I think they are 5/16". With that removed you should be
able to see the throttle body, with the big throttle blade right there
in the middle. If you work the throttle cable (on the driver’s side of
the throttle body) you’ll see the blade move back and forth. Spray some
cleaner on a lint free rag, and wipe down the throttle blade and the
throttle bore. I usually have someone keep the throttle open for me or
rig it to stay open so I can get my hand down into the throttle as far
as possible. Remove the gunk from the edges of the throttle blade, and
the sides of the throttle bore. Be very careful not to scrape the edges
of the bore with anything sharpe as it is coated with a Molybdenum(sp?)
coating.

That’s it, just put it all back together. I would not recommend
spraying cleaners into the throttle body directly as some of them can
harm the sensors that are in the throttle body. I use STP Throttle Body
cleaner.

Jeff-----Original Message-----
From: owner-xk8@jag-lovers.org [mailto:owner-xk8@jag-lovers.org] On
Behalf Of Charles_3000
Sent: Friday, August 04, 2006 5:55 AM
To: xk8@jag-lovers.org
Subject: RE: [xk8] hesitation and engine warning light

In reply to a message from Brian Mellor sent Fri 4 Aug 2006:

Ok, I understand. Thanks for checking.

TC

Charles_3000
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Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

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services and resources including Photo Albums, Event Diary / Calendar,
On Line Books and more !

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