Can I Figure Out Why This Jaguar XJS V12 Quits After 15 Minutes of Running?
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- Опубліковано 16 гру 2022
- This 1988 Jaguar XJS V12 has been to several shops however the issue hasn't been fixed. After about 15 minutes of running from cold the car quits. You can't restart it at all. If you let it sit for 1-2 hours it will start again for about 15 minutes. Can I figure out why this Jaguar XJS V12 quits after just 15 minutes of running?
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#Jaguar #XJS #v12 - Авто та транспорт
Bless this man who insists on diagnosing things before replacing parts. If only all mechanics spent their clients’ money as carefully.
It’s a big responsibility to spend someone else’s money. I try to take care of my customers as much as I can
This is a good example of the value of someone who really knows your car. Finding a Good specialist can make a huge difference. Very interesting.
You have the mind of a surgeon. Great diagnosis of mystery symptoms, strong prescriptive medicine and identifying other illnesses in the patient. Well done Dr. Adam!
My V12 Series 3 runs fantastic, is on all twelve cylinders, but occasionally dies for a split second, but carries on. A guy told me it could be these sensors, so I guess mine could be in the early stages of this failure. Worth checking out. Thanks, Adam you are a tremendous help to us Jaguar fans.
As a former Jag Master Tech, 82-2002, the most common cause pre-Marelli was the ign module on top of the motor. Inside is a GM module from GM elc ign systems (looks like a flat banana with two male spade connectors at each end). The next would be the pick-up inside the dist (less than 10% of the time). Best handling is to replace both.
I am ready to move from Thailand, buy the lot next to your shop, build a small garage and live happily out of it for my remaining days. When I croak my two XJ6s are yours!
Can you just imagine a Thai mechanic doing what you just did? Bwahaha!
Watching you logically work through the process of determining the problem's source, capitalizing on your knowledge of these engines' details, is a joy unto itself!
It’s a bit of an odd engine to have a speciality for but it’s fun
We need more mechanics like you!
I knew what was wrong with this car in the first 30 seconds only because the exact same thing went wrong on my 1987 XJ-S about 10 years ago. Same symptoms and it turned out to be the pickup coil. Great video!
The problem is the electronic ignition system, of course!
@@mikedx2706 The V12 ignition system is actually quite reliable when maintained.
@@mikedx2706 It's not the ignition system, it's the hack mechanics who don't understand or care about it. He did mention that the set screws where lose which makes me believe a hack mechanic worked on it before and screwed it up. Pay attention and learn.
Yes exactly! Someone was in there before who didn’t know what they were doing
Great bit of detective work, relevent to V12's but in principle to many others engines/cars. One to store away in brain for future reference.Thanks for great channel. A
Great info. your videos helped get my 86 xjs running after sitting for 10yrs.
Glad I could help!
Great job as usual, and what a beautiful example. I always loved the early XJS models.
Great troubleshooting again Adam! Satisfying!
Thank you for your time and video.
Another excellent video! I thought I knew quite a lot about these but I learn something new every time - thanks!
Another excellent video.A very logical approach to diagnosing problems.
Nice job on troubleshooting,,got to be satisfying to sort it out for the customer,well done,really enjoy your channel,merry christmas from New Zealand .
Just two words... Great job ;)
Well done sir. Great video.
Awesome trouble shooting!!! You continue to impress with you skill. Always enjoy watching you work. Great job.
Adam. You need to find out the various "specialists" who looked at this . Then see their charge out rate , then multiply that by 2 and use that as your datum for your charge out rate....you've still saved that client thousands ! It may have been your hobby when l first subscribed but my goodness you've become an aficionado bar none !! And don't feel any guilt , l did , and lost everytning and 30 years later l'm still getting chased by debt collectors . The only consolation is l still get "strangers" walking up to me and telling me how good l was ,which is lovely but it doesn't bring the house back or the constant "looking over the shoulder !" You have a skill few have . Use it to your advantage !
Well done Adam - very interesting.
Well done that man, have a good Christmas Adam and family, kind regards Dean.
Good one Adam great work Wayne from Tasmania got 2 XJS 84-75 love them
Good job, well done
Your are a jaguar genius Adam well done great video
Great stuff..!
Great fix!
Expecting this is what the problem with mine is. Thank you!
Wow Adam good work! No excuses for the previous mechanic though. I always wondered why there was a brass 10 thou feeler on the old school feeler guages until I had to set my pick earlier this year. 30 degrees here. Have a great Christmas TJM
Great work, fuel line, coolant hoses are great recommend.
Well done fella very interesting and probably were you take your time looking for the problem other places won't take the time like you, and it's brilliant using other parts before ordering things well done Adam
Grace Space and Pace . Well done !
Brilliant job, I'm surprised it wasn't making a noise as the gap closed.
Good job. Always best to indentify the fault beyond doubt first before doing anything. Myself I've always avoided replacing parts unless they really are faulty since replacement parts are often lower quality, even the "made to jaguar specification" ones. Used parts from scrapyards are usually much better made and they last longer.
It could be the cause of the fault was mechanical damage from something unknown, the metal fragments say something. The fault could repeat itself again.
If someone says they put new sparking plugs and they say they clean them then that means there's a problem , as misfire difficult to notice. Hook up an oscilloscope to see each sensor pulse is ideal.
Great job. Good investigative skills
Thank you!
Well done!
Thanks mate!
Another great video thanks for posting mate well done
Glad you enjoyed it
Nice job 👏
Wow ! Adam you are the maestro of Jaguars. Great vid, that is why, this guy, a mechanical dim wit likes to watch your vids. Well done, your customer must love you. BTW that XJS is the same year as mine, and mine is a coupe as well. The coupes are cool.
My guess is that the sensor was getting hot and dying due to thermal runaway. It probably would have been fine if put back in and gapped properly even though damaged. Nice job! I think I would have gone for the HEI unit first and been wrong.
Hi Adam, you certainly know your Jags pity you dont live in the UK, excellent job once again
Good fault finding. Another issue on these is that the electrolytic capacitors in the ECU get old and dry out. I had that problem some years ago. The capacitors are very easy to replace and the random injection failures were cured.
Really helpful to have spare parts to be able to substitute to prove a fault. This is what a specialist should have!
I guess if you hadn't had other parts handy you would have still taken the distributor apart and found the state of the sensor which would have been a big clue?
I don't know if the British XjS's are different on the interiors but you mentioned that this specific car was a 1988. But it looked like it had the updated 1989 steering wheel here in the States. Did you guys get that steering wheel earlier than we did in the US?
Great diagnosis , I would hate to think how much a V12 Jaguar cost in fuel alone. Over here in the UK petrol is a £1.70 for E5 fuel. We have a few classics in the garage and just down to fuel prices you have to think twice before running them over a long distance. They are both V8s, one at 3.4l and the other 4.0l. Rear wheel drive and snow is not the best.❄❄☃☃
Excellent work, the question is why did one of the other shops not pick that up.
Adam, always enjoy your videos...I have a 90 XJS v-12 and have been having a hot soak issue; car runs great with normal temp readings...then I shut her down, and then doesn't restart. Takes about a hour to cool the engine down and then it cranks to start. Would your solution on the 15 min Jag be the same fix? the only solution Ive come across is turning the ignition key in the accessory position 3-4 time and then full crank and she starts after 30 min or so. What could the problem be? ??...thanks, stranded in San Francisco!!
Can you suggest both coolant hose kits, and fuel line kits for the v12? I have an 86 xjs V12 and an 88 Hess and Eisenhardt convertible here in the US. They both need their engine bays refreshed.
Looking forward watching this video. The fact that the rev counter drops deadly to zero indicates perhaps that the signal to it dies as well immediately. Where does the signal to the rev counter come from?
As already said it has been some time ago but I am catching up!
Best wishes and cheers from Belgium!
Yes bless Adam.
didnt the early ones have 2 coils . the thing i always say to people that complain or take the mik out of these engines is to find someone who understands them well and follow there instructions for maintanence , care and repair . that way they r as good as most classics . the problems normally come from years of bodged repairs to save money
I've seen you test a lot of sensors on the v12, can this sensor also be tested with a multimeter and look for different results when cold or warm ?
I would really love to know how to read the engine code .. i have a 1995 . With a engine check light.. on . Car runs good . But im in NY and need state inspection
How could you tell it was running on only 1 or a few cylinders? Just by listening to the exhaust for misses?
what is the part number? and where do you get a NEW one, I need one, Please
Great fault diagnostics. Old school. Follow the clues unlike modern “mechanics “ and I use the term loosely who fault find by just changing part after part until the problem is solved and the customer is bankrupt!
what is this part called again?
Isn't there a coax type cable towards the back of the engine that causes problems like this on these engines?
Yes however it looked new also (forgot to mention that)
When I saw how damaged the sensor was it became very clear that it’s the issue
Is it possible that it is having a vapor lock? Merry Christmas!
I also had this problem, in my case it was cloge secondery fuel tank
Move the ignition amplifier to the bulkhead, they overheat.
relay?
So why does a start failing after fifteen to twenty minutes and not right away ?
I believe that once all the metal filings get hot they may disturb the magnetic field or maybe the sensor couldn’t stand the heat anymore after getting damaged
Dilatation can make the coil in the sensor be fine or become bad at different temperature.
How do you call that sensor in the distributor..i need one
It's called a pick up
My XJS shows a similar behavior: it starts perfectly frim cold - runs for about 10 to 15 minutes - and then stops. No way to re-start for about 30 mins. After waiting for some time and re-starting the engine - the engine runs without any further issues. Do you think this behavior is the sourced by the same defect seonsor?
Either that or the amplifier. Check if it’s spark that you lose
Definitely a "jaaaaaaag whisperer." 😄
Would be great if you'd provide part name, or part number.
Why not just clean the plugs if they were replaced recently? Ultrasonic cleaners seem to do the job, prob pay for itself if you've got 12 to do.
The black box on the engine needs replacing
Watch until the end
Are you in a Jaguar club in Switzerland?
Adam’s in Sweden.
Yes I’m Sweden