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Matt
Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 20583
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a jaguar x type, when i excellerate a huge cloud of

Customer Question

i have a jaguar x type, when i excellerate a huge cloud of black smoke comes from my exhaust. would a fuel system decarboniser clean sort it out ?
Submitted: 11 months ago.
Category: Jaguar
Expert:  Matt replied 11 months ago.
Hello a fuel system cleaner may help with the issue but I'd say that it may be overfuelling a bit so I'd 1st check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost. If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issuesAlso have a feel around with your bare hands with the engine running to see if you can feel any escaping gas under your touch. Another method is to use a soap and water solution sprayed onto any suspect areas - if there's a leak it'll bubble up with the engine running Also check that the vacuum hose running to the dump / turbo bypass valve is intact with no leaks as if the dump valve is opening prematurely you'll be losing all your boost If this is OK then remove the high pressure intake hose after the turbo and 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 one other possibility is that the wastegate actuator spring has gone soft so allowing the wastegate to open prematurely - if your actuator has a threaded end you can increase the pre load on it to see if this improves things otherwise these units are quite cheap compared to a new turbo so it may be worth trying a replacement
Expert:  Matt replied 11 months ago.
Hi
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