Sun Roof

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XJ6 Throttle Position Sensor

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Jaguar X300 Camshaft Position Sensor Repair

P0340 is CAM POSITION SENSOR

Camshaft Position Sensor (CMP)

Car had an intermittent problem where on starting the engine it would crank for 5 seconds without attempting to fire and then burst into life as normal and run perfectly. 

A fellow enthusiast (BobbyRob) at The Jag-Lovers www.jag-lovers.org forum previously had the same problem and suggested the Camshaft Position Sensor as being the problem.  

It was really easy to fit. Set the crankshaft to TDC on cylinder number 1 using the mark on the crankshaft pulley. Look through the little clear plastic lens on top of the CMP cover (see diagrams below) and a round indent will appear in the centre of the window. Now disconnect the electrical connector, loosen the single retaining bolt with an 8mm spanner and pull out the CMP. You will notice that the little indent will rotate anticlockwise when pulling up the CMP. This is because the gear at the end is helical and when refitting the replacement you will need to take this rotation into consideration. Don't turn the engine over, or you'll lose the TDC setting. Refit the replacement CMP, allowing for the clockwise rotation of the CMP when the helical gear is engaging with the mating gear in the engine, and align the little indent through the plastic window. refit the single retaining bolt with the 8mm spanner. Reconnect the electrical connector and the job is done.  For good measure spray some electrical connector cleaner on all the engine connectors I could see.

Here is a CMP extract from the Jaguar X300 workshop manual. It describes why it could take a few seconds for the engine to fire if the CMP is faulty.

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Fuel pump

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XJ6 Recalls

Recall #1
Recall #2

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Steering rack XJ6

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1995 Jaguar Vanden Plas Stats

Basic information specific to this car.


Model: XJ6

X300 Body Style

Make: Jaguar
Manufacturer: Jaguar Cars Ltd.
Model year: 1995
Country (Region): United Kingdom (Europe)
Plant: Browns Lane
Sequential number: 747179
Fewer than 500 per year: NO

Anti-brake system: 4-Wheel ABS
Body style: SEDAN 4-DR
Body type: 4 Door Sedan
Brake - front: Disc
Brake - rear: Disc
Cargo volume: —
Consumption in the city: 17 miles/gallon / 13.8 liters/100 km
Consumption on the highway: 23 miles/gallon / 10.2 liters/100 km
Curb weight: —
Driveline: RWD
Engine capacity: L6, 4.0L 219HP
Engine series: 6-Cyl. 4.0L
Engine type: 4.0L L6 DOHC 24V
Six-cylinder X300s are powered by the AJ16 inline-six engine, which is a further enhancement of the AJ6 engine that uses an electronic distributorless ignition system. 

Fuel tank: 23.10 gallon / 87.4 liter
Fuel type: Gasoline
Ground clearance: —
Optional seating: —
Overall height: 53.10 in / 134.9 cm
Overall length: 197.80 in / 502.4 cm
Overall width: 81.70 in / 207.5 cm
Series: XJ Series
Standard seating: 5
Steering Type: R&P
Tires: 225/60R16
Trim level: Vanden Plas
Turning Diameter: 40.80 in / 103.6 cm
Vehicle type: Passenger Car
Warranty distance: —
Warranty duration: —
Wheelbase: 113.00 in / 287.0 cm

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