2000 Jaguar S-Type 4.0 Problems

Tiny
YY
  • MEMBER
  • 2000 JAGUAR XJS
Hello. I have a 2000 Jaguar S-Type 4.0 with 58,000 miles. A while ago, the car started idling a bit rough at times. With this new problem came significantly decreased gas mileage (from 25 mpg to 13 mpg), and decreased power. When the car reaches above 40 mph, it stutters and vibrates. The check engine light also came on. I was told by various other 2000 S-Type owners that the valve cover gaskets can fail enabling oil to flood the spark plug wells and the ignition coils. When I pulled off the valve cover gaskets, I found that oil did saturate the spark plug wells as well as the ignition coils. I replaced all the gaskets as well as the spark plugs. The ignition coils were cleaned up and reused as they still appeared new and undamaged. After all was put back together, my problems still persist as if I did nothing. I took my car to Autozone to get a free engine diagnostic and the codes indicated that the problem could be a faulty Idle Air Control Valve or the Oxygen sensor. The codes were then cleared and the check engine light went out. When the diagnostics were run again, only the oxygen sensor was read as faulty. I replaced the oxygen sensor in the location specified but again, it was as if I did nothing at all. Before investing in a new idle air control valve I wanted to make sure this is definitely the problem. I do not want to take the car into my Jag dealer as they will charge me $220 just to look at my vehicle. If this is something that I can fix I would much prefer to do it myself. Any help is greatly appreciated. Thank you.
Do you
have the same problem?
Yes
No
Thursday, July 13th, 2006 AT 3:10 PM

4 Replies

Tiny
JACK42
  • MEMBER
Start where the on-board dignostics tell you and go from there
Was this
answer
helpful?
Yes
No
Tuesday, September 12th, 2006 AT 2:40 PM
Tiny
EARS0303
  • MEMBER
Hey I have the same problem did you find out what it was exactly. Please let me know asap I am about to take the car into the dealer.I dont want to spend that much money Im taking it tomorow morning call me at 313-529-4482 or email me at murshed_mm@yahoo. Com let me know please. My problem is the same exact one I have 90k miles and I changed the gasket and plugs so far.
Was this
answer
helpful?
Yes
No
Thursday, February 8th, 2007 AT 9:52 PM
Tiny
YY
  • MEMBER
Hello. One of my ignition coils ended up being faulty. If you are experiencing exactly the same problems that I had, then you may have one or more faulty coils. First, go buy a couple of coils (Usually about $55 each at Autozone, Murray's etc.) Then start your car and open your hood. Get close to each valve cover and see if there is some erratic snapping noise coming from them. If there are, then shut off the engine and remove one coil, and replace with a new one. Re-start your car and see if the problem goes away. Repeat this process for all eight coils (if you have a V-8) and you should be able to pinpoint the problem. If you need any further assistance feel free to e-mail me at yominyun@yahoo. Com Good luck!
Was this
answer
helpful?
Yes
No
Thursday, February 8th, 2007 AT 11:15 PM
Tiny
PHIL WARD
  • MEMBER
Hi All

i have had the same problem, Car stutters at about 40/50mph loss of power and engine management light coming on sometimes, I changed 3 of my ignition coils to start with and the problem has been cured.

:D
Was this
answer
helpful?
Yes
No
Sunday, February 25th, 2007 AT 4:41 AM

Please login or register to post a reply.

Recommended Guides