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Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 22918
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Just bought a 2005 X-Type 2.0 d sport premium and it tries

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Just bought a 2005 X-Type 2.0 d sport premium and it tries to run away with me. It speeds up when I am slowing down, and I dip the clutch or brake but it continues upon release of the pedal. The cruise control is off but sometimes the cruise control cancel button will stop the speed increase but not every time. Help please.
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this could be engine oil getting into the intake, diesels wil happily run off oil once they are warm

The first thing I'd check is the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet , however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carrys oil over with it.

If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil.

If you do find oil replace the valve. If this is all OK then its possible that the valve stem seals are past their best and are drip-feeding oil into the intake. These can be replaced without removing the head by a competent garage in half a day or so

Also check inside the intake just after the turbo signs of oil as this would be an indication that the turbo oil seal is starting to fail and a replacement / rebuilt turbo may well be required. Have a feel of the turbine wheel - there should be no play radially at all - but a little bit of axial / end to end float is normal

Customer: replied 3 years ago.

my question is about vehicle accelerating on it's own - cruise control maybe - a system management question ? I think I have been given this answer by mistake.

its possible the issue is with the cruise control, however what is far more likley is the engine oil scenario as a faulty cruise will tend to illuminate the 'check engine ' light or disbale the cruise control function entirely

As a diesel engine has no throttle engine power is controlled entirely by the amount of fuel being injected, so if you introduce another fuel source ( like engine oil) the engine rev's up on it own , or will try to accelerate as you describe

take a look and let me know what you find
Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 22918
Experience: BEng hons Mech engineering, in auto industry 22 years
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Customer: replied 3 years ago.

Thank you Matt assistance. It is all over my head but I will pass the info to my stepson .

Regards Ron.