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Jaguar XJ Series Engine questions and issues

44 messages,  Last post on Aug 03, 2009 at 3:11 PM

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#38 of 44 Re: 2000 XJ8 ASC/TRAC/Failsafe Engine Mode Lights! [lzolidis] by craig09 Apr 17, 2009 (8:15 am)
Replying to: lzolidis (May 24, 2007 11:35 am) I had the same thing happen but the oppisite the dealer replaced the throttle body then it happened again and they supposedly called in and expert and they replaced it again then told me that the computer was no good. I and a good friend who works on cars started looking and found the plug on the throttle body was not making good contact we tie wrapped it up and it worked good for 6 months now I am looking for another plug or harness. Good Luck Craig
#39 of 44 Throttle body wiring harness by craig09 Apr 17, 2009 (8:21 am)
Does anyone know were I can buy the wiring harness for the throttle body for a 2001 xj8 ?   Thank You
#40 of 44 Re: 2000 XJ8 ASC/TRAC/Failsafe Engine Mode Lights! [kconklin] by stancho Jul 28, 2009 (2:12 pm)
Replying to: kconklin (Jul 12, 2008 6:59 am) I have a 2001 xj8. I had to replace 2 throttle bodies and the problem was still there. failsafe/ no asc/no trac. someone posted on one of the forums that his connecting wires where loose on the throttle. I have cleaned all connectors with the connector cleaning spray - from pepboys and never had any problems again. the throttles cost me more han 2,000 and it was a simple connector issue to the sensors on the throttle. Replies to this message: lzolidis (Jul 28, 2009 6:15 pm) jagzilla (Jul 29, 2009 5:05 pm)
#41 of 44 Re: 2000 XJ8 ASC/TRAC/Failsafe Engine Mode Lights! [stancho] by lzolidis Jul 28, 2009 (6:15 pm)
Replying to: stancho (Jul 28, 2009 2:12 pm) Thanks for your advice on the throttle connector. I haven't had the throttle body issue come up again since the second replacement in 2007, but shortly after that procedure I began to get smoke from the exhaust pipe on a "cold" start to the car (i.e. after it was sitting for awhile). The dealer took the entire engine apart and found sludge from the prior leaseholder (Jaguar owned before I bought it). They claimed they got all the sludge, but then it happened again. After the second very expensive clean-out, where they claimed to take the engine apart "even further" than the supposedly complete first attempt, I changed dealers to one nearly an hour's drive from my house. I am much happier with the new place. The 10,000 mile checks are more thorough and done MUCH faster than the old, awful place, and customer service is excellent. My advice in the DFW area: use Overseas Motors for service, not Autobahn.
#42 of 44 Re: 2000 XJ8 ASC/TRAC/Failsafe Engine Mode Lights! [stancho] by jagzilla Jul 29, 2009 (5:05 pm)
Replying to: stancho (Jul 28, 2009 2:12 pm) Ahoy,   I've recently encountered the same problem as described above in these last two posts after returning from a long mountain trip back home. I have a '99 XJ8 and the throttle stuck as I tried to break at the first traffic light. Didn't want to stop but after hitting the brakes hard and steady, it slowed, shuddered, stopped and stalled. If I hadn't reacted quickly enough, I would probably have plowed into a vehicle at the light. Ugh! My now disappeared mech told me last year the throttle body would probably need some work or costly repairs down the road, and he was right. It won't start at all now and is sitting in the drive till I sort all my options out, plus already bought a '97 XJR, heh heh! Double trouble eh? Stability Control Failure light is on the dash, already located the inertia fuel disconnect switch under the passenger floorboard, which wasn't triggered, and already disconnected the battery to see if it's an ECM issue as to why it won't start. Any ideas out here?   Zagzilla
#43 of 44 98 Jaguar XJ8 by denham Aug 03, 2009 (8:10 am)
Fail Safe comes on at times when using cruse control. Cut engine take key out and back to normal with no Fail Safe showing. Replies to this message: jagzilla (Aug 03, 2009 3:11 pm)
#44 of 44 Re: 98 Jaguar XJ8 [denham] by jagzilla Aug 03, 2009 (3:11 pm)
Replying to: denham (Aug 03, 2009 8:10 am) Hi Denham,   Thanks for this info. I can't remember now if I had turned off the cruise switch on the gear console when this situation occurred now, but stopping the vehicle and trying to get it started again was a battery draining waste of time. It's been sitting in my driveway since the incident while I pondered the best possible solution to it's diagnosis and repair. My solution so far was last Monday,,bought a '97 XJR, LOL! Already had issues with it, being christened in with a new alternator after the old one fried to a crisp Saturday morning. Been a real dramatic week! The only OBDII code on the XJ8 showing is a pending P1112 which translates to an Air Temp Sensor issue which shouldn't be a major concern. It also shows the Stability Control Failure on the dash, but that is an amber code so it should at least still start right?   Cheers, Jagzilla

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