What year do you have? If it is the 2004 x350 you need to check your throttle body sensor connection most likely...Usually this is caused by consensation build up or oxidated on the connector.The audible sound is the car going into failsafe mode, which will usually say dsc,abs,and engine restriction...
SOURCE: where is the thr0mstat in jaguar xj8 could you please show a diag
open bonnet...front of engine where the belt is,top pulley in the middle,then just above that pulley there is a black plastic housing with 3 x 8mm bolts facing forwards and the top hose connected to it,the thermostat is in there
SOURCE: 1998 jaguar xj8 consumes anti-freeze
First thing to check is the radiator cap seal. If it is not sealing properly, the water will boil off and then soon, the anti freeze will begin to disappear. Clean the metal surfaces and gasket and make sure it is tight ---or buy a new cap --but make sure there is a seal. If that doesn't cure it, you may have a head gasket leak that blows the coolant (anti freeze) into one cylinder. If that cylinder is tight, the coolant will only evaporate in the heat and be blown out the exhaust --not entering the oil pan. Check your exhaust when you start up. You may see white smoke, or even liquid, exiting the exhaust pipe, indicating a blown head gasket (then engine may run rough, too). If this is the case, there are reasonably inexpensive cures for this in some cases.
SOURCE: very noisy squeky fron suspension on jaguar xj8
You might need a lube job or you may need to see if noise is coming from another place such as your engine water pump, brakes, power steering. Look for leaks.
SOURCE: 2002 Jaguar xj8 When I step on the brake pedal
check all the lights on the back of the car there must be a bulb burned out
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