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Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 21601
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My 2004 X-type 2.0d smokes a lot and idles roughly when first

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My 2004 X-type 2.0d smokes a lot and idles roughly when first started. I have been putting injector cleaner in it, but I have not driven it for about 2 weeks and now it seems to be a bit worse. I also have a sucking noise that I never noticed before when I accelerate and with the hood open can hear an "air release" sound from the fuel filter on shut down. It has done 85k miles. I plan to replace the fuel filter and there seem to be some kind of special connectors on it rather than just hose and clamp type. How do these work? If there is anything else you suggest other than fuel filter replacement please let me know.
Submitted: 3 years ago.
Category: Jaguar
Expert:  Shantal-Mod replied 3 years ago.
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Expert:  Matt replied 3 years ago.
Hello

I'd check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

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 issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also 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 the above are all OK then try checking for airleaks after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and leans the engine out causing rough running. As its a mechanical fault it tends not to turn on the fault light and you can sometime hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas around each joint in turn. If the engine rev's up you've found your leak.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.

if the engine condition is the same then chances are the meter or the connection to it is faulty

its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue

On no account touch the sensor wires with anything physical as they are extremely fragile

Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 21601
Experience: BEng hons Mech engineering, in auto industry 22 years
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