How to tune a Jaguar V12 - Adjusting Throttle Linkage
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- Опубліковано 2 жов 2024
- The throttle linkage is often not adjusted correctly on Jaguar V12. I'll show you how to adjust it easily with basic tools at home.
A second part will follow shortly in this video series.
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Music used: Dancing Hearts - Anders Enger Jensen • Dancing Hearts
#jaguarxjs #jaguarxj12 #jaguartune
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Great series Adam. Thanks for sharing your knowledge. Speaking from what I’ve come across in Australia, most “mechanics” now don’t know the first thing about these V12s. The specialists tend to be prohibitively expensive and don’t really want to share any info with you. My series 2 1978 XJC is currently running rich and I’m going to go through the procedures you’ve shown to try and improve it.
Please keep this quality info coming!
Thank you Andrew! I felt the same that no one wanted to share. So I decided to start a channel to share information about these old cars.
You can check out my series on D-jetronic. It might help in getting your XJC running right. They are beautiful cars!
Excellent videos.. I have a 1989 xj-s v12 5.3l LUCAS It sat for 5 years before I took possession. 23,000 miles. We got her running and now we are chasing gremlins. electrically we have most of it fixed, mechanically we have an injector kit ordered (they were stuck in the beginning). Now we want to tackle the AC unit. Removed old R12, replaced with R134 and new compressor oil. no cold air... Do you have a video on AC units and what common problems you encountered? Clutch is functional on compressor, but the electric fan does not come on and the low pressure line is not getting cold. any video on this?
Really nice Job!
I’m so happy that I found your channel.
Can’t wait to tune, adjust every part and system of my xj12 with Your help:)
Big thumbs Up!
Thank you! What years is your XJ12?
@@LivingWithAClassic I've got 78' fuel injected. I was so happy when I saw that You also have one:)
Just watched this one, what a great idea to make sure they open simultaneously. But instead of measuring throttle gap, which for me was not precise - after forcing throttles open just a wee bit like you did, I used feeler gauges on the throttle stops. Sure enough, one was .001" off. Not much, but enough to improve throttle response from a stop.
Also, making sure the throttle rods are exact same length is IMO false. I've had to readjust them when putting back on intake manifolds. The manifolds once bolted down can be a hair off from what they were before.
I have to adjust mine. From the throttle stops there's a difference between the two. I need to know which side 8s correct though.. 😢
Great channel! Here's a shot in the dark though. I have a 92 xjs, its a v12, that hasn't been run in about 2 months and the battery ran out of charge. Now that I have charged the battery, it's having trouble turning over. Any advice that you can offer before I turn it over to a shop?
Thanks!
Hi I have 1986 jag xjs v12 having problem with fuel pump not workings it's new I was told fuel control units go bad and there is a upgrade to the ecu can you help? Thanks Rex
Hello Adam, your Videos are very professionall and i feel, that you love this cars.
Now i have a special question. I have a 92 facelift xjrs with the 6 Liter Version, are the distance in the start position for the throttle also 0,05mm of it is different. Because my engine looks like yours.
Thanks mike
Do you have a diagram of the throttle linkage on a XJ6 SU dual carbs?
I knew about the adjustment of the TB plates to the rods. But my newly aquired 5.3 ltr pre HE has had the plastic bushings on the lower rod brackets crack and starting to fall apart.
Do they make brass or aluminium replacment bushings for those brackets?
Maybe late now but i got nylon ones from the ebay store Jag Improver.
Just wanted to say I’ve been watching your videos for a while and they’ve been so helpful in working on my XJS. It’s nearly ready and I’ve been videoing the progress. Without many of your videos and Facebook pages I’d be well off finishing it 😂
I'm glad I've been able to help a bit with my videos. Good luck with your XJS!
🙏 Thx. Good as Gold. 🤩
Very instructive. Followed all your videos up till now and did the checking accordingly on my V12 injection of my 1975 XJCoupe. After adjustments I found that fuel consumption significantly was reduced. For instance my map sensor leaked too much. Since I didn't want to overhaul it myself, I thought that maybe the gadget between the two halves was old. So what I did was put on some silicone. Leakage significantly reduced. Also increased a bit the pressure in the fuel bars on both sides. I was wondering how you can properly adjust the mixture during idle. There is a knob on the ECU in the back of the car. You have to measure the CO? What should be the value?
Thank you!
That is aqually going be covered in a video soon but here are the basics:
Your Co level should be between 1 and 2 % at idle adjusted with the knob. Clockwise is leaner and counterclockwise is richer.
Very helpful Adam...a visual run through of many of the issues you've addressed is a vast improvement on just having to rely on the Haynes manual.
Thankyou
You're welcome!
Thank you so much for this one man! I was still a little fuzzy and need to make certain mine is right!i have a 1989 back on the road this last week, and although there were some mental illness moments, certainly worth it. I am going to check out check out all your vids man for this car.
Thank you! Please let me know if there are any topics you wish to see on here.
A+++++, Adam. I don't have a V12, but I'm learning a lot with your excellent instruction!
Thank you Richard! Maybe you'll have a V12 in the future?
@@LivingWithAClassic Not likely. I need to sell FIRST! I'm up to 34 cars NOW!😣
Oh wow! I'd love to know what you got
@@LivingWithAClassic All British & German. Here's a list of my favorites:
1. 1956 Jaguar XK140
2. 1962 Jaguar XKE OTS
3. 1963 Jaguar MK 2
4. 1969 Jaguar XKE Coupe
5. 1994 Jaguar XJ6 Convertible
6. Several XJ6VP (1983, 1985 &
1986, 1995, 1997 w/ 37,000
miles & 2005 XJ8VP)
7. 1962 Mercedes 190SL
8. Several MB Turbodiesels
(300D, 300TD, & 300CD)
9. 1987 & 1990 MB 560SEC
10. Several newer W210 MBs
(E320, E300 & E300TD)
11. 1991 Range Rover Classic
12. Several Rolls Royces
(6 Silver Shadows, Silver Spur
and 62 Silver Cloud)
13. 1999 Bentley Arnage
14. Almost forgot: 83 MB 380SL,
88 MB 560SL, & 1989 560SL
15. 1979 Triumph Spitfire
16. 1972 Triumph TR6
There are others, but mostly duplication of each model. I buy nice cars & hate to sell them! All are in excellent condition. I wrench on them EVERY day! Come on over to the US & BUY a few!
@@richardgreene3460 oh man!You should be very proud of them.
Thank you for taking the trouble to make this video - I look forward to checking my V12.
You're welcome! The next video on tuning the V12 will be up today 😊
Hi, what about V12 engine when is hot 90° don't want to start and is smell on non burn petrol , when the engine is cold is start first time, what's is your opinion V12 1989 marley ignition
Very informative....your presentation makes it easy to follow
Thank you Clinton! Glad you found it useful.
Hi, could you let me know how to change the linkage rubber bush at the end of the throttle linkage, part# CR34388 as both mine have perished (one each side). I have the new parts to fit but can't seem to see how to dismantle it..
Where is AB14 located on your car?
Excellent. I will check my throttle setup accordingly. 🤞
At 60mph I currently get app 23mpg (imperial!). This is not bad at all but I think there is room for improvement.
Doesn't sound bad at all 😊
How do you get 23mpg I get around 9 city 12-13 highway in my 94 xj12
Man I would love to just spent a day with you in your shop! A young guy like me could learn a lot from you... I only started getting in to cars in university.
I would really like to own an XJS 6 cylinder when I graduate. Soaking up your videos now so that I'm one day ready.
Here's a question. I understand these v12 engines are almost like two of the straight six engines mated together. Does this mean many of the procedures on these V12s are the same in the 6 cylinders?
Haha how old do you think I am?
In the case of the XJS the 12 cylinder and 6 cylinder engines are very different. They don't really share any parts.
@@LivingWithAClassic ha I don't think you're that old, sorry that's not what I meant to imply!
Are the 6 cylinders easier to work on than the 12's? The 6 cylinders probably have more room I would imagine
You do get a lot more room with a 6 cylinder and every job takes a lot less time. Yet nothing can beat the V12!
Good afternoon Adam, I fallow your instructions to the latter, my 🐆 92 XJS V12 when bizzare, the passenger side muffler it when red hot, I turn it off, and wait to cool down, restart, this time it was popping gun sound on this side only, turn it off, than I decided to check spark plugs, and they were gap to 35 not 25, o and the throttle butterfly were close all the way no 002, your suggestions?
Where these things checked before?
Red hot sounds like one side stopped firing and dumped fuel in the exhaust.
@@LivingWithAClassic
When I got the car it was running good but not great, I can smell gas on the back of the car, drive side, air from muffler was warm, driver side was cold air and slower pulse, and no explosions, I could pick up speed easy, but now I can't get to 20 mph, I'm getting new spark plugs and gap them @ 25, adjust the thrudle to 002 and hope will work fine like should be, right
@@LivingWithAClassic
Throttle, sorry for miss spell
@@LivingWithAClassic
The last owner always took the car to the Jaguar dealer, don't understand why they didn't adjust the throttle right, and spark plugs gap them correctly?
Great instruction Adam. 👍
Thank you Graham! I'm pleased with this one 😊
Amateur with the wrong tools. Those who really work on (old) cars know this is badly set and missing data.
Thank you for your comment. This method has worked well for me on numerous cars. To each his own 😊