X_Type_South_Africa

Thanks to everyone for all your assistance. Shortly after creating this thread I solved the problem, however wanted to wait a few weeks to make sure the problem was truly solved. A few days before the shudder began, I added a fuel additive to my petrol tank after filling up, which I suspect may have cleared any dirt and debris in the fuel system, however clogged an injector at the same time. As a last resort, I added a strong mixture of injector cleaner, which has solved the problem! The car is running like a dream, and had I known that this would be the cure in the beginning, it would have saved me a heck load of money!

Hi Peter, thank your for your response. It could be a possibility and suspected the same when the issue first appeared, and have since replaced the fuel filter. I will definitely do what you say and check the injectors. Regards Steve

Hi, I hope someone will be able to give me some assistance with an issue I’ve been trying to resolve for a while. I have a 2008 model 3.0L V6 AWD X-Type with 150 000km (93 000miles) on the clock. I really love the car, and it’s the third Jag I’ve owned. About a month ago I started noticing a jitter, stutter, jerk (whatever you want to call it) when traveling in the city between 50-70km/h (31-44mph), particularly when travelling uphill or with additional weight in the car, and I’ve had no warning lights appear on the dashboard. It doesn’t occur every time I drive the car, however when it does it seems that it occurs when I accelerate normally through the gears until I reach the lowest gear and lightly feather the accelerator at about 44mph. The stutter goes away as soon as I apply the break or accelerate more rapidly. Furthermore, occasionally a similar feeling occurs when accelerating from rest or close to rest, where it feels as if I’m applying and releasing the accelerator at a fast rate or am momentarily losing and regaining power, despite keeping the accelerator at the same level. I serviced the car 3 weeks ago where the air, fuel and oil filters where replaced as well as the engine oil, and also had a diagnostic test run on the car at my local Jaguar dealer, and no error codes where reported. The issue wasn’t resolved. I found another local mechanic who works on Jaguars, who too ran a diagnostic on the car where a misfire in cylinder 3 was reported. They found a leak in an air pipe which was fixed and the error code went away, and all seemed fine, however the stutter wasn’t resolved. After taking the car for a ride to experience the feeling, the head service manager felt that it may be as a result of a misfire due to a faulty spark plug or ignition coil. I replaced all the spark plugs and bought one ignition coil and replaced it with the old one in cylinder #3, hoping the previous error code of a misfire in that cylinder was a hint. The problem is still there though; however there is no guarantee that the faulty coil (if that is the issue) is actually in cylinder #3. Should I shuffle the coil that I know works around in the various cylinders in the hope that I eventually find the faulty one and solve the problem? Like I said it doesn’t always happen, however on occasions that it does, the stutter seems more exaggerated than the previous time, and other times it’s very mild; I don’t want to ignore it which may lead to something bigger. Any kind of advice or help would be greatly appreciated. :) :)