S-Type / S type R Supercharged V8 ( X200 ) 1999 - 2008 2001 - 2009
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New Engine Problem?

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Old 04-24-2009, 01:07 PM
Join Date: Aug 2008
Location: Pacific Northwest, USA
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Sounds like misfiring. Does your fuel have Ethanol in it??

I came across similar symptoms/problem two months ago when my dealer filled my car up with crappy fuel loaded with ethanol. My STR HATED it and misfired like a son of a bitch. Had to flush the injectors, and replace a coil and spark plug because of it.

The feeling was much like what you describe....At a stop, the car would almost chug or lunge (not the lurch) as the rpm's dipped or surged. I also noticed and felt it when I was driving the car down the road under acceleration though, which you do not mention in your post.

My check engine light came on after about 10 minutes of the problem starting, which was immediately after the tank was filled with crappy fuel by the dealer.

The Dealer told me that in order for a misfire to alert the computer system of a problem, a cylinder must misfire twice in a row. Otherwise it is considered an anomaly and nothing to worry about. But yours could still be doing it, just not all the time so it could be "fooling" your engine's computer even though there's a problem (assuming your engine light in not lit).

At the Dealer, to replace a spark plug and coil, as well as flush out the injectors, the total came to $550 bucks. The Dealer picked up the tab after I threw a raging fit because it was their worthless decision to fill my car up with Regular grade Ethanol spiked gas. (I was also pissed because the car just had $4,700 worth of work done on it and it ran worse coming out after that than it did when it went in...lol)

Of course, I'm not a Jaguar Tech, so I could be totally wrong about your problem. It's worth looking into though....

Best of luck in getting it sorted.

Scott
 

Last edited by hottienamedscottie; 04-24-2009 at 01:27 PM.
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