2003 Jaguar X-TYPE 2.0 Loss of Power

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Q   I have a 2003 Jaguar X-TYPE 2.0
petrol (it is actually a 2.1-litre but they call it a 2.0) with 103,000 miles. The problem is that there isn’t a lot of power compared to when I first owned the vehicle. It had then covered 90,000 miles. The problem has occurred about three times. I will be driving along at around 40mph in fifth gear when, all of a sudden, I get full power, but this only lasts about 10 seconds before it goes back to no power. I have changed the ECM (twice), the coolant sensor and the MAF sensor, and the camshaft and crankshaft sensors. I have also replaced the spark plugs, the oil and filter, and the air filter. When I changed the four oxygen sensors and the aspirator, it gained a little more power.
J Cheetham

A   As you say, the engine in your Jaguar has a displacement of 2.099 litres, so is technically much closer to a 2.1 than 2.0. Among the items you have listed as changing, you do not mention the fuel filter. If this has not been replaced then this should be your first move – the filter can be found under the offside rear of the vehicle just in front of the fuel tank. You also do not say if you have used a code reader on your Jaguar and, again, if this has not been done it may prove beneficial, even if no management light is present. If the fuel filter has been replaced, I suspect your problem could either be the fuel pressure sensor in the fuel rail, or the throttle body assembly or throttle pedal unit. The pedal unit can be tested with an ohmmeter by checking the resistance between pins 1 and 6, and 2 and 3, on the connecting plug. The resistance between pins 1 and 6 should be within the range of 546-1134 ohms, and the resistance between 2 and 3 should be between 975-2025 ohms.

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