• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)

Intermittent Hard Starting on 99 XJ8 Trouble Code

Michael J.

Jedi Warrior
I bought a 99 XJ8 last month. I have occasional hard starting and plugged in an Accutron Code Reader and am getting Code P1000 but I do not find a listing for that code. Any thoughts?

Deleted member 8987

Gleaned from the Internet:

P1000 - OBD-II Monitor Testing Incomplete

Normal driving (or a Drive Cycle) may clear this code. However, dimming and brightening may indicate a faulty battery, corroded/loose connection(s) in the Starter or Charging system(s), or a faulty Alternator/Regulator.

Poster would have the battery, alternator and related wiring inspected/checked.


Jedi Knight
How many miles on the car? Service history? What exactly is "hard starting, long crank time? More info please.

Michael J.

Jedi Warrior
140,000 Miles on the car.

Long crank time, but not always, seems to change with the weather. My friend's 99 Vaden Plas takes only half the time to start. Had a code of P1000 but it was not listed in the OBDII code list on Jag Lovers.


Jedi Knight
Good service might be in order. Change the plugs and airfilter, and fuel filter. The correct plugs are expensive, but use them. Check the drain around the fuel filler. Water can get into the fuel if the drain is clogged.The other things these cars do is to have catastrophic timing chain failure. You should pull the valve covers and inspect the secondary tensioners at your first opportunity. If they are plastic, get them changed pronto.


Great Pumpkin
Country flag
If the tensioners ARE plastic (by all means change them as Jesse recommends), they need to be framed and displayed with that many miles on 'em!! :jester:


Jedi Knight
Second gen was plastic too. Some have lasted from the 60K range to the 140K plus range. Scary....

Michael J.

Jedi Warrior
There are three sets of ground wire connections under hood (bonnet). Two are located one each behind each set of headlights. The third is on the firewall obscured by the heater valve?

Each has an acorn nut securing the wire eyelets. I found corrosion on the nuts and cleaned with a gun bore cleaning brush. I used a Scotchbrite pad on the eyelets before applying dielectric grease on the surfaces and then reconnecting.

The problem appears to have gone away. My theory is that the corrosion was causing a high enough resistance to interfere with the various circuits.

I had already replaced spark plugs. I have a new fuel filter, but have not found any instructions on stopping the fuel while the filter is replaced under the car.

Deleted member 8987

When General Misunderstanding came out with computers, first thing they taught us was don't assume it's a computer related problem, second was to clean the grounds.
Still, to this day, grounds are a BIG problem, heat, cold, water, salt, sun. Expansion, contraction, and then water.


Jedi Warrior
Maybe this will help:

<span style="font-style: italic">V8 XJ Series/XK8
1997-99 MY
XK8 Range
1998-99 MY
V8 XJ Series NA
See text
Difficult Cold Start – Normally Aspirated
Engines – ECM Flash Reprogramming –
Service Action S479
Since the launch of Service Actions S819 and S471 further developments in software have
become available.
A new PDU disk is now available, labeled “XK8/XJ Series DRIVEABILITY supercedes S471”
‘S479’, which may be used to reprogram the ECM of the following vehicles:
• 1997-98 MY XK8 VIN 001036-020733
• 1998 MY V8 XJ Series VIN 812256-819771 NORMALLY ASPIRATED ENGINES
Note: 1998 XK8 VIN 020733-031302 and V8 XJ Series VIN 819772-
853935 do not have ECMs that can be reflashed.
S479 does not apply to supercharged vehicles.
Customers may complain of difficulty in starting the engine, from cold, on vehicles within the
above VIN ranges, under certain running conditions. In some instances a no-start condition may
be reported. Many of the affected vehicles may have been reprogrammed on a previous
occasion, under Service Action S819 or Service Action S471. Since Service Action S479
supersedes both Service Action S819 or Service Action S471 do not perform Service Action
S819 or Service Action S471.</span>


Michael J.

Jedi Warrior
Who can perform the reprogramming? Is that a dealer only or can a repair shop perform? Closest dealer is just over an hour away in Baton Rouge. I am still finding connectors to clean with contact cleaner.

Had the problem solved again just in time for the resin thermostat housing to have the threaded cap blow off. I ended up installing the cast aluminum replacement housing I had bought a little sooner than I had planned.

The rear two bolts are really in a fun location partly under the plenum for the induction. Nothing like a well thought out design! I cut an 8mm ignition wrench box end to 1.5" to loosten the tew rear bolts.


Jedi Warrior
Welcome to Jaguar Ownership!

Gotta love 'em! These are either - fix them somehow yourself, or pay through the nose at a dealer of authorized service shop.

To flash the ECM - you either need the updated program and the Jaguar PDU which cost dealers something like $22k for the PDU, or
locate a replacement ECU that has been flashed in a salvage car in a Salvage Yard and buy that.

One place to check is JagBits.com, another place is another forum just for Jag's https://www.jag-lovers.org/

For another option ...
If someone has access to the program binary or a flashed EEPROM, I have an EEPROM programmer, the EEPROM chips are cheap - $5-$15.
Similar threads
Thread starter Title Forum Replies Date
Jim_Stevens TR2/3/3A Intermittent starting Triumph 14
Griz Intermittent Misfire Austin Healey 33
S Intermittent operation of tachometer Austin Healey 9
Jim_Gruber Intermittent Horn Spridgets 2
T intermittent deflating tyre Austin Healey 6
Crankshaft TR2/3/3A Intermittent ignition switch problem Triumph 9
RedTR3 TR2/3/3A Periods of Intermittent Missing Triumph 34
doughairfield TR4/4A Intermittent vibration at 3000 RPM Triumph 2
alanjohnturner TR4/4A intermittent brake-light switch Triumph 11
AUSMHLY intermittent right blinker Austin Healey 14
Tugboat TR2/3/3A TR3A Intermittent Pulling When Braking Triumph 5
Michael Oritt Intermittent short Austin Healey 14
R Intermittent starter Austin Healey 8
G Intermittent flasher [the TR that is] Triumph 8
nevets Intermittent sputtering Austin Healey 38
Shinsen774 Intermittent Stumble - Diagnosis? MG 7
R BJ8 overdrive intermittent Austin Healey 11
roscoe Intermittent weirdness Austin Healey 20
V Intermittent engine cut out 1989 v12 xjs Jaguar 9
athenssprite tach is intermittent Spridgets 5
healeyboz Intermittent problem finally fixed Spridgets 6
19_again intermittent power loss MG 0
Baz Intermittent miss? Spridgets 24
AUSMHLY Got intermittent wipers? Austin Healey 2
Dadandson Frustrating Intermittent Problem Spridgets 8
gsalt57tr3 Intermittent Start problem Triumph 1
MadRiver Slightly OT -- Intermittent short with my Tiger Triumph 14
Brosky Bizarre cooling leak....intermittent, too!! Triumph 0
M Intermittent Cooling Fans -'78 B MG 5
M Intermittent Wipers [the bad kind] MG 3
RobSelina Intermittent turn signals.... Spridgets 6
MGTF1250Dave Intermittent Electric Faults MG 9
M Intermittent starting problem Jaguar 1
B TR2/3/3A TR3 Hard Top Triumph 2
T Wedge TR7 brake hard and flex lines - fittings Triumph 12
Basil Spitfire Hard Top Seal Triumph 5
Madflyer MG B hard top MG Classifieds 0
Sopwith_Camel hard top bracket happy day Spridgets 4
steveg Toyota W58 Trans Hard Getting Into Gear Austin Healey 8
K TR2/3/3A Hard start questions.... Triumph 4
BLong63AH BJ7 Hard Fuel Lines Austin Healey 20
Lin Brake hard line question Austin Healey 4
A BN4 Hard Top Austin Healey 23
Healey Nut Good hard top on flea bay Austin Healey 6
W Spitfire Hard Top rubber Triumph 5
K For Sale TR3 Engine Lift Bracket...hard to find! Triumph Classifieds 0
D General TR Hard lessons learned Triumph 4
Rut TR6 Hard top finisher Triumph 1
Rob Glasgow Hard Top Rubber Seal Austin Healey 3
1 MGB 1966 MGB hard shifting into 3rd MG 1

Similar threads