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Jaguar XJ Series Engine questions and issues

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

You are in the Jaguar XJ-Series Forum. Your Hosts are pat & karens

What is this discussion about? Jaguar XJ-Series, Jaguar, Engine, Sedan


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#5 of 44
Re: XJ12 oil leak [kwrp] by euphonium
Apr 26, 2007 (9:19 am)
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Replying to: kwrp (Apr 26, 2007 8:40 am)

Check for leaks in the transmission cooler line. Often tranny coolers have a small radiator mounted in front of the engine radiator and tranny fluid is cooled by it.
 
Another possibility is the need to replace one or both of the main radiator hoses due to corruption over time.
#6 of 44
Re: XJ12 oil leak [euphonium] by kwrp
Apr 27, 2007 (7:57 pm)
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Replying to: euphonium (Apr 26, 2007 9:19 am)

Thanks for the response, I took it to my mechanic and they couldn't find an oil leak. But had to top of the trans fluid. I'll definitely keep your comments in mind as I start out this driving season.
#7 of 44
1996 XJR Not started in 6months and now wont start!! by eshaze
May 21, 2007 (8:00 am)
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Hi there i've got a 96 XJR, I started it 6months ago with no problems it used to be a daily driver however since moving abroad I haven't started it for 6 months. After coming back into the UK I knew that the battery would need replacing so I bought a new one, I've turned it over and tried to start it and it doesn't fire what so ever, what could have happened in the time that it was standing?? any help greatly accepted thankyou Sam
#8 of 44
Re: 1996 XJR Not started in 6months and now wont start!! [eshaze] by euphonium
May 21, 2007 (8:07 am)
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Replying to: eshaze (May 21, 2007 8:00 am)

Perhaps there wasn't enough fuel stabilizer in the petrol tank while in storage. For ignition you need fire and fuel. Your battery supplies the fire so I question the quality of the fuel.
#9 of 44
Re: 1996 XJR Not started in 6months and now wont start!! [eshaze] by kwrp
May 21, 2007 (8:48 am)
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Replying to: eshaze (May 21, 2007 8:00 am)

I can tell you what happened to my '94 XJ12. I bought a new battery and discovered that the starter wires had corroded sp? and had new ones replaced. It starts every time.
#10 of 44
2000 XJ8 ASC/TRAC/Failsafe Engine Mode Lights! by lzolidis
May 24, 2007 (11:35 am)
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The ASC not available and TRAC not available lights came on when I was driving last week, triggering "Failsafe Engine Mode" as an immediate response. The dealership service center tells me the car needs a new throttle body assembly at a cost of $1550. They looked at the exact same problem 8 months ago and replaced a module (for $1700). Should the throttle body issue have been caught on the first visit? Since the dealer says the current problem is "new," it falls outside the 12-month guarantee of their work and I'll be out both for the repair and the rental car.
#11 of 44
Help? by notaclue2
Sep 09, 2007 (12:27 pm)
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First off, I apologize for not posting this in the correct spot - as my user name indicates, I truly don't have a clue about any of this. My ex-husband left me with a 1985 XJ-6 that he had put a 350 chevy engine in. I know that at one time he had it running and drove it off and on, but the last I knew he said it needed a starter and had an oil leak. It's really in decent shape - white with blue leather interior. Can someone give me an idea of what I could get for it if I sold it as is? I really need to get it out of the shop but have no idea what to ask for it. Thanks for any help you can give me.
#12 of 44
Re: Help? [notaclue2] by euphonium
Sep 09, 2007 (3:55 pm)
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Replying to: notaclue2 (Sep 09, 2007 12:27 pm)

Another division of Edmunds is their True Value Appraisal feature. Locate it and fill in the blanks. It considers many factors including location.
 
There were quite a few Jags converted to the 350 Chevy engine in and around the Portland, OR area and the shop charged $1,000 for the conversion.
 
Repair the starter problem, fix the oil leak, and have it detailed before putting it up for sale. (you never get a 2nd chance at a 1st impression)
#13 of 44
Loss of engine oil presure after warm up by jkoonce
Oct 01, 2007 (8:33 am)
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I own a 1991 XJS with the 5.3 V12 with 69,000 miles and everytime I take it out, after about an hour or hour and 1/2 the oil presure will drop to 25lbs, 15lbs then finally it will just die. It is very hard to re-start and shows no oil presure as I crank it. Sometimes won't start until the engine is completely cooled down.
 
Does anyone have any idea what this might be? Oil looks clean, warms up to just slightly above the "N" on the temp gage.
 
Lost in Charlotte,NC
#14 of 44
Re: Loss of engine oil presure after warm up [jkoonce] by Mr_Shiftright HOST
Oct 01, 2007 (8:42 am)
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Replying to: jkoonce (Oct 01, 2007 8:33 am)

Well for one thing Jaguar V-12 oil pressure sensors and gauges are notorious for giving faulty readings. So you might not have low oil pressure at all. So have that checked.
 
Also, you MUST use 20W50 oil. If you have lighter oil, you will lose oil pressure in this engine
 
As for hard starting, this may be a different problem, with the ignition sensors for the flywheel rpm and the crankshaft sensors. They fail with age, as they heat up.
 
there are also sensors for engine temperature that will shut the engine down if the sensor (right or wrong) "thinks" the engine is overheating.
 
These are all kind of typical Jaguar V-12 issues. You need to have these things diagnosed one by one.

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