I have a 2000 Jaguar S-type, 4.0 V8. It has approximately 62,000 miles on the car. Some of the mechanical history of the

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Customer: I have a 2000 Jaguar S-type, 4.0 V8. It has approximately 62,000 miles on the car. Some of the mechanical history of the car is it went into failsafe mode once, and I had to change the throttle body. There are no codes on the car because the battery died while I was in Europe. Since then I have charged the battery, and it starts relatively easy. Sometimes it wont start right up, but if I try two or three times it starts fine. This issue I am having is that it bogs down really bad, and has no power at all. I took it to a mechanic and he told me that he believed the timing chain skipped a tooth or two, and said that cylinders were misfiring.. If I remember correctly, he said cylinder 1-4. I am pretty mechanically savvy, but this car has thrown me for a loop. I read that some cars go into fail-safe and cut off power to 4 cylinders, which would make sense., but the car doesn't say fail-safe mode this time. I suspected perhaps the TPS sensor because when it is unplugged nothing happens. There is no power when you try to press the gas lightly, but if I push it down harder, it tries to take off okay. I have replaced 4 out of the 8 coils. Please help!
Answered by Richard in 1 hour 12 years ago
15+ years of experience

19,890 satisfied customers

Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs

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Based on your description it sounds like you may have clogged cat converters, a weak fuel pump or possibly the timing chain has in fact jumped. All will cause the symptoms you described. You can verify the timing is not the problem by removing the valve cover. Since cylinders 1-4 are the problem remove the passenger side valve cover. Inspect to see if the secondary timing chain tensioner has broken and the front of the cam flat spots are not aligned. You may want to check the driver side too just in case. For the fuel pump we need to install a fuel pressure gage to the rail to monitor the fuel pump output.

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19,890 satisfied customers
15+ years of experience
15+ years of experience

19,890 satisfied customers



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