Emissions JAGUAR XJ6 1997 2.G Owner's Manual

3261 Jaguar XJ6
REF•14Fault finding
2 Fuel system
Engine surges while holding accelerator steady
m mIntake air leak (Chapter 4).
m mFuel pump faulty (Chapter 4).
m mLoose fuel injector harness connections (Chapters 4 and 6).
m mDefective ECU (Chapter 6).
Pinking or knocking engine sounds during
acceleration or uphill
m mIncorrect grade of fuel.
m mDistributor installed incorrectly (Chapter 5).
m mFuel injection system in need of adjustment (Chapter 4).
m mImproper or damaged spark plugs or wires (Chapter 1).
m mWorn or damaged distributor components (Chapter 5).
m mFaulty emission system (Chapter 6).
m mVacuum leak (Chapter 4).
m mFuel rail feed (inlet) hose has hardened, resulting in knocking noise
near dash (see Chapter 4).
Engine lacks power
m mIncorrect ignition timing (Chapter 5).
m mExcessive play in distributor shaft (Chapter 5).
m mWorn rotor, distributor cap or wires (Chapters 1 and 5).
m mFaulty or incorrectly gapped spark plugs (Chapter 1).
m mFuel injection system malfunctioning (Chapter 4).
m mFaulty coil (Chapter 5).
m mBrakes binding (Chapter 1).
m mAutomatic transmission fluid level incorrect (Chapter 1).
m mFuel filter clogged and/or impurities in the fuel system (Chapter 1).
m mEmission control system not functioning properly (Chapter 6).
m mLow or uneven cylinder compression pressures (Chapter 2).
Engine rattles at start-up
m
mFailure of upper timing chain tensioner (Chapter 2).
Engine backfires
m
mEmissions system not functioning properly (Chapter 6).
m mIgnition timing incorrect (Chapter 1).
m mFaulty secondary ignition system (cracked spark plug insulator,
faulty plug leads, distributor cap and/or rotor) (Chapters 1 and 5).
m mFuel injection system malfunctioning (Chapter 4).
m mVacuum leak at fuel injector(s), intake manifold or vacuum hoses
(Chapter 4).
Engine stalls
m mIdle speed incorrect (Chapter 1).
m mFuel filter clogged and/or water and impurities in the fuel system
(Chapter 1).
m mDistributor components damp or damaged (Chapter 5).
m mFaulty emissions system components (Chapter 6).
m mFaulty or incorrectly gapped spark plugs (Chapter 1).
m mFaulty spark plug leads (Chapter 1).
m mVacuum leak in the fuel injection system, intake manifold or
vacuum hoses (Chapter 4).
Engine runs with oil pressure light on
m mLow oil level (Chapter 1).
m mIdle rpm too low (Chapter 1).
m mShort in wiring circuit (Chapter 12).
m mFaulty oil pressure sending unit (Chapter 2).
m mWorn engine bearings and/or oil pump (Chapter 2).
Engine diesels (continues to run)
after switching off
m mIdle speed too high (Chapter 4).
m mExcessive engine operating temperature (Chapter 3).
m mIncorrect fuel octane grade.
Excessive fuel consumption
m
mDirty or clogged air filter element (Chapter 1).
m mIncorrectly set ignition timing (Chapter 5).
m mEmissions system not functioning properly (Chapter 6).
m mFuel injection internal parts worn or damaged (Chapter 4).
m mLow tyre pressure or incorrect tyre size (Chapter 1).
Fuel leakage and/or fuel odour
m
mLeak in a fuel feed or vent line (Chapter 4).
m mTank overfilled.
m mFuel injector internal parts excessively worn (Chapter 4).
3 Cooling system
Overheating
m
mInsufficient coolant in system (Chapter 1).
m mWater pump drivebelt defective or out of adjustment (Chapter 1).
m mRadiator core blocked or grille restricted (Chapter 3).
m mThermostat faulty (Chapter 3).
m mRadiator cap not maintaining proper pressure (Chapter 3).
m mIgnition timing incorrect (Chapter 5).
Overcooling
m
mFaulty thermostat (Chapter 3).
External coolant leakage
m
mDeteriorated/damaged hoses; loose clamps (Chapters 1 and 3).
m mWater pump seal defective (Chapters 1 and 3).
m mLeakage from radiator core or manifold tank (Chapter 3).
m mEngine drain or water jacket core plugs leaking (Chapter 2).
m mHoses behind water pump leaking (Chapter 3).
Internal coolant leakage
m
mLeaking cylinder head gasket (Chapter 2).
m mCracked cylinder bore or cylinder head (Chapter 2).
Coolant loss
m
mToo much coolant in system (Chapter 1).
m mCoolant boiling away because of overheating (Chapter 3).
m mInternal or external leakage (Chapter 3).
m mFaulty radiator cap (Chapter 3).
Poor coolant circulation
m
mInoperative water pump (Chapter 3).
m mRestriction in cooling system (Chapters 1 and 3).
m mWater pump drivebelt defective/out of adjustment (Chapter 1).
m mThermostat sticking (Chapter 3).
1 Engine (continued)

3261 Jaguar XJ6
Glossary of technical termsREF•21
RotorIn a distributor, the rotating device
inside the cap that connects the centre
electrode and the outer terminals as it turns,
distributing the high voltage from the coil
secondary winding to the proper spark plug.
Also, that part of an alternator which rotates
inside the stator. Also, the rotating assembly
of a turbocharger, including the compressor
wheel, shaft and turbine wheel.
RunoutThe amount of wobble (in-and-out
movement) of a gear or wheel as it’s rotated.
The amount a shaft rotates “out-of-true.” The
out-of-round condition of a rotating part.
SSealantA liquid or paste used to prevent
leakage at a joint. Sometimes used in
conjunction with a gasket.
Sealed beam lampAn older headlight design
which integrates the reflector, lens and
filaments into a hermetically-sealed one-piece
unit. When a filament burns out or the lens
cracks, the entire unit is simply replaced.
Serpentine drivebeltA single, long, wide
accessory drivebelt that’s used on some
newer vehicles to drive all the accessories,
instead of a series of smaller, shorter belts.
Serpentine drivebelts are usually tensioned by
an automatic tensioner.
ShimThin spacer, commonly used to adjust
the clearance or relative positions between
two parts. For example, shims inserted into or
under bucket tappets control valve
clearances. Clearance is adjusted by
changing the thickness of the shim.
Slide hammerA special puller that screws
into or hooks onto a component such as a
shaft or bearing; a heavy sliding handle on the
shaft bottoms against the end of the shaft to
knock the component free.SprocketA tooth or projection on the
periphery of a wheel, shaped to engage with a
chain or drivebelt. Commonly used to refer to
the sprocket wheel itself.
Starter inhibitor switchOn vehicles with an
automatic transmission, a switch that
prevents starting if the vehicle is not in Neutral
or Park.
StrutSee MacPherson strut.
TTappetA cylindrical component which
transmits motion from the cam to the valve
stem, either directly or via a pushrod and
rocker arm. Also called a cam follower.
ThermostatA heat-controlled valve that
regulates the flow of coolant between the
cylinder block and the radiator, so maintaining
optimum engine operating temperature. A
thermostat is also used in some air cleaners in
which the temperature is regulated.
Thrust bearingThe bearing in the clutch
assembly that is moved in to the release
levers by clutch pedal action to disengage the
clutch. Also referred to as a release bearing.
Timing beltA toothed belt which drives the
camshaft. Serious engine damage may result
if it breaks in service.
Timing chainA chain which drives the
camshaft.
Toe-inThe amount the front wheels are
closer together at the front than at the rear. On
rear wheel drive vehicles, a slight amount of
toe-in is usually specified to keep the front
wheels running parallel on the road by
offsetting other forces that tend to spread the
wheels apart.
Toe-outThe amount the front wheels are
closer together at the rear than at the front. On
front wheel drive vehicles, a slight amount of
toe-out is usually specified.
ToolsFor full information on choosing and
using tools, refer to the Haynes Automotive
Tools Manual.
TracerA stripe of a second colour applied to
a wire insulator to distinguish that wire from
another one with the same colour insulator.
Tune-upA process of accurate and careful
adjustments and parts replacement to obtain
the best possible engine performance.TurbochargerA centrifugal device, driven by
exhaust gases, that pressurises the intake air.
Normally used to increase the power output
from a given engine displacement, but can
also be used primarily to reduce exhaust
emissions (as on VW’s “Umwelt” Diesel
engine).
UUniversal joint or U-jointA double-pivoted
connection for transmitting power from a
driving to a driven shaft through an angle. A
U-joint consists of two Y-shaped yokes and a
cross-shaped member called the spider.
VValveA device through which the flow of
liquid, gas, vacuum, or loose material in bulk
may be started, stopped, or regulated by a
movable part that opens, shuts, or partially
obstructs one or more ports or passageways.
A valve is also the movable part of such a
device.
Valve clearanceThe clearance between the
valve tip (the end of the valve stem) and the
rocker arm or tappet. The valve clearance is
measured when the valve is closed.
Vernier caliperA precision measuring
instrument that measures inside and outside
dimensions. Not quite as accurate as a
micrometer, but more convenient.
ViscosityThe thickness of a liquid or its
resistance to flow.
VoltA unit for expressing electrical
“pressure” in a circuit. One volt that will
produce a current of one ampere through a
resistance of one ohm.
WWeldingVarious processes used to join metal
items by heating the areas to be joined to a
molten state and fusing them together. For
more information refer to the Haynes
Automotive Welding Manual.
Wiring diagramA drawing portraying the
components and wires in a vehicle’s electrical
system, using standardised symbols. For
more information refer to the Haynes
Automotive Electrical and Electronic Systems
Manual.
Serpentine drivebelt

3261 Jaguar XJ6
REF•22Index
AABS fault finding -9•2
Accelerator cable -4•8
Acknowledgements -0•4
Aerial - 12•8
Air cleaner -1•14, 4•7
Air conditioning -3•2, 3•7, 3•10, 3•11, 3•13, 3•14
Air induction system -4•9
Air Injector Reactor (AIR) system -6•8
Air intake plenum -4•13
Airbag - 0•5, 12•14
Alternator -5•6
Amplifier -5•3
Anti-lock Brake system (ABS) -9•2
Anti-roll bar - 10•3
Anti-theft system - REF•1
Antifreeze -0•11, 0•16, 1•2, 1•20, 3•2
Asbestos -0•5
ATF -0•16
Automatic transmission-7•1et seq
fault finding - 7•1, REF•15
fluid - 0•16, 1•2, 1•11, 1•19
filter - 1•19
Auxiliary shaft -2A•8
BBalljoints - 10•4
Battery -0•5, 0•15, 1•9, 5•1, 5•1
Big-end bearings -2B•13, 2B•17
Bleeding
brake system - 9•10
power steering - 10•11
Block -2B•10, 2B•11
Blower motors -3•7
Body corrosion - REF•11
Body electrical system- 12•1et seq
Bodywork and fittings- 11•1et seq
Bonnet - 11•3, 11•4
Boot - 11•7
lid - 11•3, 11•6, 11•7,
Boots (steering) - 10•9
Brake fluid -0•12, 0•16, 1•20
Brake lights - 12•12
switch - 9•13
Brake servo -1•12
Braking system-1•12, 9•1et seq
fault finding - REF•15, REF•16
MOT checks - REF•8 to REF•10
Bulbs -0•15, 12•11
Bumpers - 11•5
Burning -0•5
CCables -4•8, 5•2, 7•2, 7•4, 9•10, 9•11, 11•4, 11•10
Calipers -9•3
Camshafts -2A•9
Capacities -1•2
Carpets - 11•1
Cassette - REF•1
Catalytic converter -6•12
Central locking - 12•13
Centre console - 11•11
Charcoal canister -6•11
Charging -1•10
Charging system -5•5
Circuit breakers - 12•3
CO emissions (mixture) - REF•11
Coil (HT) -5•3
Coil spring - 10•5, 10•6
Compression check -2B•3
Compressor -3•13
Condenser -3•13
Connecting rods -2B•9, 2B•12, 2B•17, 2B•18
Console - 11•11, 11•12
Continuity check - 12•2
Control arms - 10•5, 10•6, 10•8
Conversion factors - REF•2
Coolant -0•11, 0•16, 1•2, 1•20, 3•2
Coolant reservoir -3•4, 3•5
Coolant temperature sensor -6•3
Cooling fans -3•3
Cooling system fault finding - REF•14
Cooling,heating and air conditioning systems-3•1et seq
Courtesy lights - 12•12
Cowl cover - 11•14
Crankcase ventilation system -1•16, 6•11
Crankshaft -2A•5, 2A•17, 2B•10, 2B•13, 2B•16
position sensor - 6•7
Cruise control - 12•13
Crushing -0•5
Cylinder head -2A•13, 2B•6, 2B•7, 2B•8
Cylinder honing -2B•12
DDashboard - 11•13
Dents - 11•2
Differential -8•1, 8•5
oil - 1•2, 1•11, 1•20
Dimensions - REF•1
Direction indicators - 12•4, 12•11, 12•12
Discs -9•4
Distributor -5•4
Doors - 11•7, 11•8, 11•9, 11•10, 11•10, REF•9
Drivebelt -1•16
Driveplate -2A•16
Driveshafts -8•1, 8•4, 8•5, REF•10
Drivetrain-1•14, 8•1et seq
Note:References throughout this index are in the form - “Chapter number” • “page number”

3261 Jaguar XJ6
IndexREF•23
EEarth check - 12•2
ECU -6•2
EGR gas temperature sensor -6•7
Electric shock -0•5
Electric windows - 12•13
Electrical equipment -1•14, REF•9
Electrical system fault finding - 12•1, REF•17
Electronic control system and ECU -4•9, 6•2
Electronic Fuel Injection (EFI) system -4•9, 4•10
Emissions and engine control systems-6•1et seq
Engine electrical systems-5•1et seq
Engine in-car repair procedures-2A•1et seq
Engine fault finding - ref•13,ref•14
Engine oil -0•11, 0•16, 1•2, 1•6
Engine removal and overhaul procedures-2B•1et seq
Environmental considerations - REF•5
Evaporative Emission Control (EVAP) system -6•10
Evaporator and expansion valve -3•14
Exhaust emission checks - REF•11
Exhaust Gas Recirculation (EGR) system -6•9
Exhaust manifolds -2A•4
Exhaust system -1•11, 4•2, 4•14, REF•10
Expansion tank -3•4, 3•5
FFans -3•3
Fault finding- REF•12et seq
ABS -9•2
automatic transmission - 7•1, REF•15
brakes - REF•15, REF•16
cooling system - REF•14
electrical system - 12•1, REF•17
engine - REF•13, REF•14
fuel system - REF•14
suspension and steering systems - REF•16, REF•17
Filling (bodywork repair) - 11•2
Filters
automatic transmission fluid - 1•19
fuel - 1•15
oil - 1•6
Fire -0•5
Fluids -0•16
Fuel and exhaust systems-4•1et seq, REF•11
Fuel filter -1•15
Fuel gauge - 12•7
Fuel pressure relief -4•2
Fuel system fault finding - REF•14
Fume or gas intoxication -0•5
Fuses -0•15, 12•2
GGaiters - 10•9
Gashes - 11•2
Gaskets - REF•5
Glass - 11•3, 11•10, 11•11, 12•13
Glossary of technical terms- REF•3, REF•18et seq
Glove box - 11•13
Grille - 11•5
HHandbrake -1•12, 1•20, 9•1, 9•10, 9•11, REF•8
Handles - 11•9, 11•10
Hazard flasher - 12•4
HC emissions - REF•11
Headlights -1•18, 12•9, 12•10, 12•11
Heated rear window - 12•8
Heater -3•2, 3•7, 3•9, 3•10, 3•11, 3•12
High-mounted brake light - 12•12
Hinges - 11•3
Horn - 12•11
Hoses -1•10
Hub bearings - 1•17, 10•8
Hydraulic system -0•16
Hydrofluoric acid -0•5
IIdle Speed Control (ISC) motor -4•11
Ignition switch - 12•6
Ignition system -1•15
In-tank fuel pumps -4•4
Indicators - 12•4, 12•11, 12•12
Inertia switch -4•1, 12•12
Information sensors -6•3
Injectors -4•12
Instruments - 1•14, 11•12, 12•6, 12•7, 12•12
Intake Air Temperature (IAT) sensor -6•7
Intake manifold -2A•4
Interior lights - 12•12
Introduction -0•4
JJacking - REF•1
Joint mating faces - REF•5
Jump starting -0•7
KKickdown cable -7•2
Knee bolster - 11•13
LLatch - 11•4, 11•7, 11•9
Leaks -0•9, 1•10, 7•2
Locknuts,locktabs and washers - REF•5
Locks - 11•3, 11•7, 11•9, 12•6
Lubricants -0•16
MMain bearings -2B•13, 2B•16
Manifolds -2A•4
Manual valve -7•7
Mass Airflow (MAF) sensor -6•6
Master cylinder -9•6
Mirrors - 11•11, 12•14, REF•8
MOT test checks- REF•8et seq
Mounts -2A•18, 7•8
Multi Point Fuel Injection (MPFI) system -4•1