I think I found the issue! There was a bad ground connection on the valve that selects from which tank the fuel comes from. It would only take fuel from the left tank and pump it over to the right. The left ran low on fuel and that was the issue it seems.
Well Adam we all know that's the name of the game sometimes . At least you nursed her back home , that saved money and embarrassment !!! It's always nice to see that even with the best preparation we all come unstuck occasionally . Thanks Adam . It was great to see your very young assistant (s) ! 😁🐶
Thanks for showing both the ups and downs on the channel! My XJ6 leaked transmission fluid when it sat for a long period of time and I found the leak to be the where the kickdown cable entered the transmission case. I took the cable out, used some silicone sealant around the gasket where it enters the transmission case and never had a leak again.
Glad to hear it seems to be a simple fix. As with all electrical issues, I'm glad you didn't let the smoke out. Looking forward to seeing the follow-up. Cheers.
Just a bit of troubleshooting and she'll be back on the road! Never underestimate using injector cleaner at least 2 times a year, so that it cleans injectors, valves, pump, tubing, etc. Also, this morning, I have been working on the fan shroud of my XJ40, because I really want to convert it to electric cooling fan. I also replaced the rubber flaps on the shroud, so they'll open properly when going down the road.
Good luck, keep fingers crossed. Things like this with the fuel supply, change over valves or ignition happen after a longer standstill... My XJ V12 didn't want to fire into life after winter and once it got off the breakdown lorry rolled into the workshop it fired-up straight away and we never sourced what was going on....
Oh that looks all too familiar, nursing a car home lol. Did it a few times back home in Iceland, and most recently when I purchased my current DD6 down in Kent. Drove 630km to where I live now in Scotland. Misfiring above 3,500rpm and overheating somewhat on the last leg. Would I rather drive a Tesla cross thingymajig? Never! Looking forward to the DD6 to be back on the road (even thinking about ditching the X350 XJ6, as I don’t really drive much). As always, great videos Adam!
Its such a beautiful old car ! . Im sure from my childhood that the max speed (UK) was 153mph in 1970 when new (It was the fastest saloon car in the world) . There are a few V12's over here in the UK for sale.... but i'm going through some troubled times and fuel costs lol . Its just the idea of that "airplane" /aeroplane engine under the bonnet (hood) !!! . I'm sure it will be fine .. AH !!!... just remembered ... ALL Lucas tachometers required a a few gentle taps on the glass and they would spring into life :-) . (Triumphs, Jaguars, .... way back in the 80's if they worked immediately there was something wrong with them)
I recall that the original SU fuel pumps in my DS420 had backflow prevention, to prevent the fuel from being pumped from one tank to another. Even though you think you found the problem, related to a bad ground, it may be that you have yet another problem...
Adam.... disconnect the fuel pump.... squirt high quality release oil into the inlet ! (NOT WD40) . Then some 2-stroke oil into the inlet and let it run for a good few second ? . I'm guessing you would need a good few gallons in each tank to show 1/4 full in each as they are so thirsty ! . Then some 2-stroke mixed into t gallon can and poured into each tank to lubricate its way through. . Adam, over here in the UK they never broke down, they just rotted away ! . A Jaguar specialist many years ago told me that he had never done a head gasket, ever, on a V12 . . GOOD LUCK BUDDY
As with all things reality sometimes gets in the way, no matter how well you maintain a vehicle. Its good to hear it seems to be a simple fix. Simple once you have found the fault!
I've found an air hammer to be an excellent tool for removing ball joints, probably largely because of the number of impacts per second. Thanks for the video. Your knowledge of the systems involved and diagnosis is impressive, very systematic.
Hey I really enjoy watching your XJ12 videos. Poor Jagggg hopefully you can find out what that issue is. But it’s a very nice collection you have overall. My goal is to have a decent Jaguar collection in the future.
Adam, not sure if this applies to the Jag V12. On our old 74 SAAB 99 which also had the Bosch D-Jetronic injection system, there was a set of points under the breaker plate in the distributor which were the pulse generator for the injection system. If there was any sort of contamination on these at all, there would be all manner of odd and inconsistent driveability issues. If you still have intermittent rough running once reliable fuel pressure is restored, take a look at them.
I had just the same with mine a few days ago and it was a bad ground to the fuel pump. I hate that changeover switch too and so I have retrofitted two pumps instead of one and used the changeover power to turn on a relay. Now I have two pumps instead of one just like the original jags and because the pumps have built in check valves then no issue with fuel pumping from one thank to another. Not only that but i needed a changeover switch anyway which are not cheap and buying a second (new) pump was a far cheaper and better option.
Either a faulty changeover switch or faulty return solenoid and fuel is going back to the other tank. Back firing maybe more likely to be ignition? I have an issue with my Daimler Double Six ATM, it is hunting on tickover when cold!
Suggest you add in line fuel filters in each line from the tanks to protect the select valve and the pump from debris. My fuel "fuel select valve" stuck for no reason, so no fuel to the pump. Note, to clear debris, you can temporarily reverse the power to the pump to back flush the fuel lines. Good Luck.
I add filters on the carbureted ones but not on fuel injected ones. It can restrict the high flow needed for the pump. These tanks are very clean inside and the filters in the tanks are clean too
I did that on mine as even after cleaning the tanks I was not happy with the colour of the fuel. Now mine has three filters, one from each tank and one to the fuel rail after the pump. Now I have fitted two pumps like the old Jags had and I can switch from one to the other and junked that useless changeover valve.
Yeah Adam made it...had me on pins n needles. We are lucky in British Columbia they closed all testing stations years ago and later emission test stations. Mainly because most cars fairly new. Boy Adam is really out in the sticks, Russians never find them.
It sat due to illness. I’ve had it on many long road trips. Guess you’ve never had one. This is the first time in 10 years of ownership something has happened
@@LivingWithAClassic yes I have owned one it was the most prettiest car but it was nothing but junk it was a money pit and it always found something to go wrong with it it had very low miles on it and it was 18 years old so I would never ever touch one again and there's no resale on that card just for that reason
I both agree and disagree. Yes, a Japanese car (and I have one too) is almost perfectly reliable and takes much less fuel, but these old Jags have their charm, and these days, they are used mostly as toys, for fun. When a car is used for fun instead of for daily life, it become different. Yes one thing or another will break, but I take my Japanese car while I wait for the parts, then I repair it and I can enjoy it again for a while.
I think I found the issue! There was a bad ground connection on the valve that selects from which tank the fuel comes from. It would only take fuel from the left tank and pump it over to the right. The left ran low on fuel and that was the issue it seems.
Glad it was that and nothing too serious.
Great!
Good deduction . I like your systematic approach to problem solving .
Peace and love brother 👍🏻☮❤
Thr rule of Occam's Razor.
Living with a classic sometimes means "failing to proceed" on occasion ! But you made it home.
Well Adam we all know that's the name of the game sometimes . At least you nursed her back home , that saved money and embarrassment !!! It's always nice to see that even with the best preparation we all come unstuck occasionally . Thanks Adam . It was great to see your very young assistant (s) ! 😁🐶
Thanks for showing both the ups and downs on the channel! My XJ6 leaked transmission fluid when it sat for a long period of time and I found the leak to be the where the kickdown cable entered the transmission case. I took the cable out, used some silicone sealant around the gasket where it enters the transmission case and never had a leak again.
You'll get it. Take a breather, clear the mind, and press on.
Hoping that bad ground is the source of the problem! You will get the MOT inspection done no problem!
Thanks for a cool video as always.
Thanks Mark! It seems to be the ground so far. Going to test a few more things but it does seem logical
Good you made it back home. Thats the thing with old cars....We love them despite their quirks.
Seems like an easy fix this time.
You have a very calm little helper...starting young 😀
Glad to hear it seems to be a simple fix. As with all electrical issues, I'm glad you didn't let the smoke out. Looking forward to seeing the follow-up. Cheers.
You were very calm, cool and collected when the problem hit. Impressive. Can’t wait to see what your investigation reveals!
Just a bit of troubleshooting and she'll be back on the road! Never underestimate using injector cleaner at least 2 times a year, so that it cleans injectors, valves, pump, tubing, etc. Also, this morning, I have been working on the fan shroud of my XJ40, because I really want to convert it to electric cooling fan. I also replaced the rubber flaps on the shroud, so they'll open properly when going down the road.
Good luck, keep fingers crossed. Things like this with the fuel supply, change over valves or ignition happen after a longer standstill... My XJ V12 didn't want to fire into life after winter and once it got off the breakdown lorry rolled into the workshop it fired-up straight away and we never sourced what was going on....
Oh that looks all too familiar, nursing a car home lol. Did it a few times back home in Iceland, and most recently when I purchased my current DD6 down in Kent. Drove 630km to where I live now in Scotland. Misfiring above 3,500rpm and overheating somewhat on the last leg.
Would I rather drive a Tesla cross thingymajig? Never! Looking forward to the DD6 to be back on the road (even thinking about ditching the X350 XJ6, as I don’t really drive much).
As always, great videos Adam!
Hi Adam what a shame but I’m glad she got you back home and if anyone can fix it you can Adam thanks for sharing 👍🏼
Thanks Rick! How’s your XJ6 going?
Nice work Adam, I admire your patience and cool with this beautiful car.
Well that's a bummer. Here's hoping it easy to identify and just as easily remedied.
Cheers for the video, 👍what a great car. 👏
Thanks!
Its such a beautiful old car !
.
Im sure from my childhood that the max speed (UK) was 153mph in 1970 when new
(It was the fastest saloon car in the world)
.
There are a few V12's over here in the UK for sale.... but i'm going through some troubled times and fuel costs lol
.
Its just the idea of that "airplane" /aeroplane engine under the bonnet (hood) !!!
.
I'm sure it will be fine
..
AH !!!... just remembered ... ALL Lucas tachometers required a a few gentle taps on the glass and they would spring into life :-)
.
(Triumphs, Jaguars, .... way back in the 80's if they worked immediately there was something wrong with them)
I recall that the original SU fuel pumps in my DS420 had backflow prevention, to prevent the fuel from being pumped from one tank to another. Even though you think you found the problem, related to a bad ground, it may be that you have yet another problem...
Adam.... disconnect the fuel pump.... squirt high quality release oil into the inlet ! (NOT WD40)
.
Then some 2-stroke oil into the inlet and let it run for a good few second ?
.
I'm guessing you would need a good few gallons in each tank to show 1/4 full in each as they are so thirsty !
.
Then some 2-stroke mixed into t gallon can and poured into each tank to lubricate its way through.
.
Adam, over here in the UK they never broke down, they just rotted away !
.
A Jaguar specialist many years ago told me that he had never done a head gasket, ever, on a V12
.
.
GOOD LUCK BUDDY
As with all things reality sometimes gets in the way, no matter how well you maintain a vehicle. Its good to hear it seems to be a simple fix. Simple once you have found the fault!
I've found an air hammer to be an excellent tool for removing ball joints, probably largely because of the number of impacts per second. Thanks for the video. Your knowledge of the systems involved and diagnosis is impressive, very systematic.
You're so calm. I would be red with anger. ( PS Your kid seems to be already interested in mechanics lol).
Hey I really enjoy watching your XJ12 videos. Poor Jagggg hopefully you can find out what that issue is. But it’s a very nice collection you have overall. My goal is to have a decent Jaguar collection in the future.
Nice work Adam. These ones are good, when the car still gets you home... you can mull the issue on the way back.....
Adam, not sure if this applies to the Jag V12. On our old 74 SAAB 99 which also had the Bosch D-Jetronic injection system, there was a set of points under the breaker plate in the distributor which were the pulse generator for the injection system. If there was any sort of contamination on these at all, there would be all manner of odd and inconsistent driveability issues. If you still have intermittent rough running once reliable fuel pressure is restored, take a look at them.
The one improvement the XJ-S had was having one fuel tank!
Great car Adam, keep it for your son! Think how amazing it will be in 15 years time when he starts to drive!!
I hope to keep this car forever
Annoying, Adam, but you will get through te test no problem. And you've clearly got a keen apprentice there!👍
A Jaguar breaking down?!! Unbelievable.
I had just the same with mine a few days ago and it was a bad ground to the fuel pump. I hate that changeover switch too and so I have retrofitted two pumps instead of one and used the changeover power to turn on a relay. Now I have two pumps instead of one just like the original jags and because the pumps have built in check valves then no issue with fuel pumping from one thank to another. Not only that but i needed a changeover switch anyway which are not cheap and buying a second (new) pump was a far cheaper and better option.
Either a faulty changeover switch or faulty return solenoid and fuel is going back to the other tank. Back firing maybe more likely to be ignition? I have an issue with my Daimler Double Six ATM, it is hunting on tickover when cold!
Was that was a real live Swedish gremlin stealing your tools🤪
Suggest you add in line fuel filters in each line from the tanks to protect the select valve and the pump from debris. My fuel "fuel select valve" stuck for no reason, so no fuel to the pump. Note, to clear debris, you can temporarily reverse the power to the pump to back flush the fuel lines. Good Luck.
I add filters on the carbureted ones but not on fuel injected ones. It can restrict the high flow needed for the pump. These tanks are very clean inside and the filters in the tanks are clean too
I did that on mine as even after cleaning the tanks I was not happy with the colour of the fuel. Now mine has three filters, one from each tank and one to the fuel rail after the pump. Now I have fitted two pumps like the old Jags had and I can switch from one to the other and junked that useless changeover valve.
Hi, love your videos so I thought you might be able to help me identify what jag I own 👍😁
Bummer. Hope it's nothing too serious.
It’s seems to be a pretty simple issue so far
You have a clogged fuel filter. the JAGUAR of that era add numerus electrical problems,
I do not. Simply ran out of fuel
Coil .? I say that because your rev counter not working .
So far no one has made an engine diagnostic retrofit harness with computer for these complex cars to isolate defaulrs, and they probably never will.
They are not electrically complex. The wiring is very basic. There is nothing computer controlled.
Yeah Adam made it...had me on pins n needles. We are lucky in British Columbia they closed all testing stations years ago and later emission test stations. Mainly because most cars fairly new. Boy Adam is really out in the sticks, Russians never find them.
It takes big buns to buy a V12 these days!!!
Good thing I got 3 of them!
Money pit you won't get 30day
Before something else goes.
That's why they sit in garages.
And definitely not a trip car.
It sat due to illness. I’ve had it on many long road trips. Guess you’ve never had one. This is the first time in 10 years of ownership something has happened
@@LivingWithAClassic yes I have owned one it was the most prettiest car but it was nothing but junk it was a money pit and it always found something to go wrong with it it had very low miles on it and it was 18 years old so I would never ever touch one again and there's no resale on that card just for that reason
I’m sorry you had that experience. They have always been great to me and I work on a lot of them for customers.
Maybe you’re not mechanically inclined
@@LivingWithAClassic that was the whole idea constantly working on them I drive a Honda now
I both agree and disagree. Yes, a Japanese car (and I have one too) is almost perfectly reliable and takes much less fuel, but these old Jags have their charm, and these days, they are used mostly as toys, for fun. When a car is used for fun instead of for daily life, it become different. Yes one thing or another will break, but I take my Japanese car while I wait for the parts, then I repair it and I can enjoy it again for a while.