Tips X300

Liste établie par Go LPG un installateur anglais de système GPL :
Used Jaguar X300’s – Common faults

Extrait d’un message publié sur le forum Jag-lovers
En rouge les soucis rencontrés sur notre XJ6.
Jaguar 1995-1997 X300 (AJ16)
Common Problems/Weaknesses – After 10 yrs/100,000 miles

1 Cracks in exhaust manifold
2 Faint LCD clock display segments
3 Leaking automatic dimming rear view mirror – free replacement (improved model)
4 Oil pressure sender fails – early models only
5 Seat memory (small changes?) and stiff front to back movement switch
6 Fuel sender shows 3/4 full when tank full – clean or renew sender unit
7 Rust spots along windscreen rubber area – visual check
8 Failed steering wheel motor, either the up/down (tilt) or in/out (drive coupling shaft fails)
9 Leaking camshaft cover seal – check the front of the head for oil leaks – renew seal
10 Cylinder head gasket – slight oil loss near oil galley – renew with improved version
11 Front lower wishbone bushes worn – renew
12 Split on front downpipe – repair by welding
13 Rust on rear wheel arches (pre ’95 models)
14 Radio fails to recognise CD player (NOT CONT) – (re)solder SMD component
15 Rough idle – use correct spark plugs
16 Dirty throttle body – can lead to stiff throttle/rough idle – clean
17 Corroding rear bumper supports – renew
18 Mouldy smell when air conditioning switched on or off – clean evaporator
19 Timing chain rattle -fit new-style tensioner
20 Worn front shock absorber isolators cause clunking noises from front of car – renew
21 Worn lower radiator mounting bushes – renew
22 Leaking pwr steering high-pressure hose-renew every 100,000 km
23 Petrol tank takes ages to completely fill-clean pipe to charcoal canister
24 Failed J-gate lighting – renew bulb or use a green 12V LED
25 Premium sound rear woofer cone detaching from voice coil
26 Sagging headliner (hot climates only)
27 Cable(s) through boot lid hinge can fracture
28 Worn driver’s seat bolsters
29 Corroded valve cover
30 Loose flex (Jurid) driveshaft fitting – tighten
31 Broken fins on rear centre-vent
32 Bad brake/park microswitch – adjust
33 Heater pump fails – renew brushes (brushes N/A from Jaguar)
34 Interior lights flicker – clean or renew rear door microswitch
35 Boot lock barrel seized – clean & lubricate (graphite powder) – use regularly to avoid prob
36 Worn A-frame bushes cause knocking noises from rear of car – renew
37 Supercharger pulley bearing fails – renew
38 Dash lights fail or intermittent – renew/repair ECU in steering column
39 Bowden cable to open driver’s door fails – renew or repair
40 Dull/misty headlamps – clean the INSIDE of the glasses using a polishing compound
41 Cracked seat frame – weld together
42 Leaking oil bypass O-rings – renew
43 Leaking CPS O-ring – renew
44 Loose upper steering column
45 Loose front undertray
46 Play in driver’s seat tracks
47 Corroded bulkhead post terminal
48 High level brake light comes unstuck – re-glue
49 Bonnet insulation rubbing
50 Door stay breaks away from door
51 Crankshaft position sensor fails – Renew every 100K mile

Pour mémo le même type de liste appliqué cette fois aux X308. La source est également Jag-lovers.
La X308 succède à la X300. Elle a un moteur V8 (dont les premiers modèles ont connu des soucis à cause d’un revêtement Nikasil qui fondait à cause des caractéristiques corrosives de l’essence vendue en Angleterre lors de sa sortie). Ce problème est très bien décrit dans le fascicule de Jaguar World.

1. NIKASIL engines. My advise is DON’T buy an XJ8 with a NIKASIL engine, its not worth it when you can find steel liner engined cars. You can have a NIKASIL engine tested for blow by, but its no guarantee that it wont fail in the future due to past damage, read on…

This leaves two options. A later model. Jaguar introduced the steel liner engine around August 2000, but don’t rely on the cars year or its VIN. You need to check the engine number, search the forums and or piston heads for further information.

Or look for an earlier model, with a new non NIKASIL engine fitted by Jaguar. Be very careful again, even Jaguar replaced faulty NIKASIL with new NIKASIL engines at some point in the saga. You need documented evidence of a steel liner engine.

Jaguar say any car 2000 onward is okay, evidents exist to say not.
The poor, high sulpher fuel that was one of the main problems was outlawed by the EU in January 2000. But cars earlier than this still may have suffered damage that will eventually kill the engine. Also high sulpher fuel wasn’t the only problem, a  »quirk » of the XJ8, is the way the ECU can flood the engine. If the car is started from cold, say to move out of the garage, then immediately turned off, say to shut the garage; when restarting it can flood
the engine washing off all the lubrication, the common restart method is foot to the floor and crank for a couple of minutes, this may have also worn the NIKASIL, problem awaiting to bite?

2. Thermostats can fail, causing overheating, the plastic water pump impellers can also then fail due to the increased temperature. The result can be cylinder head damage.

3. Timing chains and tensioners, hotly debated subject on the web, just try searching the forum.

4. Rust. Yes XJ8s do rust, the rust proofing isn’t good 97-01.
Look for underbody corrosion, sills, front wings, arches, around screens etc.

5. Maintenance, your XJ40 is blessed with a plentiful supply of used spare parts (because they are so reliable, and usually rust away before they fail), hence its cheap to keep going. The
situation isn’t the same for the XJ8, supply and demand makes the cost of a used steel liner engine 10 times more than a used XJ40 3.6 or 4. I think a per annum budget of GBP800 is a sensible guide, plus servicing costs.