I have a 2004 XK8 Convertible with36,000 miles on it. The car has been fairly reliable until NOW.....
I starting getting sporadic Check Engine Warning Light a few months ago. It would quickly disappear but reappeared with increasing frequency until it finally remained lit up on the message center. THe first message was "Limiter (crusie control) not available. THe next message was ASL (Automatic Speed Limiter) not available. Te car has begin to ride rough. It feel like it is missing gears and will make an onbnoxious honking noise at times. Has anyone else had this issue? Does anyone know what may be causing the issue?
A wild guess - your crank speed sensor. But, with this level of malfunction, pull the codes. Buy a code reader (EOBD/OBD) from Ebay or go to a Jaguar dealer or any decent engine diagnostic center and they will tell you what is malfunctioning. The codes don't tell all the story, they just tell you what is out of tolerance - there could be a lot of things out just because one component is malfunctioning, so you need someone who has expertise with this engine.
A wild guess - your crank speed sensor. But, with this level of malfunction, pull the codes. Buy a code reader (EOBD/OBD) from Ebay or go to a Jaguar dealer or any decent engine diagnostic center and they will tell you what is malfunctioning. The codes don't tell all the story, they just tell you what is out of tolerance - there could be a lot of things out just because one component is malfunctioning, so you need someone who has expertise with this engine.
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I did take the car to both a Jag dealer and independent shop that services Jags. Both told me the exact same thing: NOTHING. They said that the fault codes were showing multiple occurrences where 7 out of 8 cylinders were misfiring. They looked at the sparkplugs and cylinders and said nothing looked suspect. They also performed software upgrades on Emissions and Transmissions module.
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