This V12 Shouldn't Have Run with this Bad Fix - - Restoring an Early XJ-S ep.6

This V12 shouldn't have run with this bad fix by a previous mechanic. Join me as I test some sensors on the engine and make a list of what this Jaguar V12 will need to be back on the road. Restoring and Early Jaguar XJ-S!
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[@LivingWithAClassic]

I forgot to mention it but of course step 1 is to clean up that engine bay before I start working on it.

[@mikedx2706]

Those manifold pressure sensors (MPS) can be repaired. They are also used on the Porsche 914s. Tangerine Racing sells a repair kit for the brass diaphragm which goes bad in the MPS. They provide instructions for adjusting the MPS. You might be able to use that kit to repair the V12’s MPS.

[@parrotraiser6541]

An odd mixture of thoroughness and outright kludging, (the blocked hose) in the restoration. Probably prudent to treat everything with a degree of scepticism about its correctness.

[@LivingWithAClassic]

I definitely will. That’s why I want to check valve clearances also. However this could of been bodged at the body shop where the car was abandoned

[@Andys_Vauxhall_Vids]

Hey great video always loved the jags especially the V12. I remember them when I started working in garages in my teens. Remember the mechanics saying if you've got a misfire good luck finding it or even knowing about it. loved peering into that huge engine bay and what looked like a plane engine!

[@grayfool]

Looking forward to seeing you work on this engine. I'm no expert on the V12 so this will be very interesting.

[@donnysweekendvanlifetravel7854]

Nice to see you start on this project hope you and family is well look forward to the next vid all the best donny

[@LivingWithAClassic]

I’m glad you’re enjoying it Donny! I think I need to check your channel out, so you post about traveling in a van?

[@donnysweekendvanlifetravel7854]

@@LivingWithAClassic yes and mechanic stuff too be honered to have you along on my journeys

[@henrikjauert3398]

Hello, I love your site and I watch all your videos, the content is great, but you could use some help with lighting. When using the powerful light source, just point it at the roof above where you are filming, this way you will get a very nice soft light covering everything, and the contrast will be much better. Try it out. Cheers from Denmark.

[@icsamerica]

Lots of documentation on D-jetronic if you look up the Porsche 914. That 4 cylinder Porsche uses the same system and it's well documented. Jaguar added an amplifier that multiplies the injector pulse x 3 in order to fire all 12 cylinders.

[@davidrhodes7655]

The E type V12 never suffered half the problem s that the XJS had

[@jeffharrison5265]

Another great and timely video. Please provide part numbers for new or upgraded parts as you go along as I'm working on my V12 right behind you. Cheers.

[@mikehill4970]

You make the work look fun, Thanks.

[@Pandanreis-Rice-Jasminrijst]

Hello Adam please can you do a defenitive remove of the aircocompressor and hoses, because everything is leak behind the dash. Can't run it anymore. XJ 12 HE 5.3 year 85. And what about a vacuum lesson of the compleet system? Nice regards from Chris Love your program,byebye

[@LivingWithAClassic]

I have a few videos that show this. I will also be redoing all the AC on this XJ-S

[@kennethpeek2474]

Roger By water @ AJ6 eninering knows everything about these fuel injection sysms & ECUs.

[@LivingWithAClassic]

Alamogordo everything but there were a few things I couldn’t get answer from him on my XJ12 years ago. Found the info in other places and could fix the last few things

[@weofnjieofing]

What’s the chance if removing all that intake plumnage and slapping on a set of 6 Weber carbs?

[@LivingWithAClassic]

Would look cool but doesn’t fit under a rock bonnet. I want the car to look stock but have a few nice upgrades

[@v12mike30]

I had a MAP sensor fail on my 1975 XJ-S, it was the brass diaphragm which had split around the circumference, I made a couple of attempts to repair it (unsuccessfully), then parked the car for a year while I looked for a replacement. I guess you know that there were 2 versions fitted to European cars, with the changeover at engine 8S5203 (1977?). The later type seems to be much easier to find, but yours would be the early type, which is identified by the part number on the Lucas sticker being 73140A. If you fit the later type, the calibration is wrong and the engine does not run well, but it would probably be OK to swap in a matched set of MAP sensor and ECU from a later pre-HE. It is also worth pointing out that until engine 8S5202, the injection ECU does not have an over-run fuel cut-off, which is great if you intend a manual gearbox conversion, I see that your car does not have over-run valves on the manifolds, but for some reason, mine does and if the over-run valves are fitted, the car has a tendency not to decelerate when you take your foot off the throttle, which can be uncomfortable, particularly if the idle speed is also set a little high... BTW, I did spot the fuel filter in that video 5 minutes before you mentioned it!

[@johndavey72]

Hi Adam . You've "accidently " become an aficionado on V12 's ! The perfect illustration was "hasn't anybody noticed the fuel filters ?" I think 99% of us hadn't !! 😆😆 lt's going to take lots of patience and knowledge to do this car and you're just the rignt man for the task ! Thanks Adam.

[@wolframgeuting453]

Adam , great , that will be a lot of nice and informative videos . Happy to see them All in future . You are absolutely right very little technical detailed support around for the V12 Jaguar engine’s. Thank you .

[@jeffharrison5265]

Love the V12 firing order mug. Suggestion, put your channel logo on the other side of that mug. Cheers.

[@MM_in_Havasu]

Good stuff in this series of episodes with the XJS! Lots of work to be done, but it will be a sweet ride when you complete its refurbishment/restoration! Thanks for cool video content!

[@williamendres1265]

Great video Adam, looks like you made some good finds going thru the engine bay!

[@dnulsrot]

If it does not hold vacuum it will run high idle so they close the leak :) But it do run without the vacuum on MAP.

[@dougwernham5209]

Very helpful thank you Adam

[@8000Christopher]

Hi Adam, I have a black 1988 XJS V12, and I would love to change it from a 3 speed automatic to a 4 speed automatic. Simply Performance can help with that, right ? A 4 speed would enhance the performance nicely, I believe.

[@truthseeker5911]

I did this on my 1979 XJS and it was a big improvement with better fuel economy and lower engine speeds with the overdrive 4th gear and lockup converter.

[@davidsolloway9349]

Good plan Adam.

[@RickCT2000]

What's your guesstimate on the total cost of your mental list of parts - new, used or rebuilt. Is it $100's or $1000's? Curious.

[@LivingWithAClassic]

To sort out the engine and get it looking nice is about $1000-$1500 in parts depending on if I get the upgraded SNG Barrett ignition system or not. That part alone is near $800. I hope to get the rest of the car on the road for less than $1000. I will keep track though if spending and cover it when it’s done

[@RickCT2000]

@@LivingWithAClassic that will be a good tally to see down the road. I think the engine and body look very solid. Not knowing what you had to pay for the car, I still think you have a keeper!

[@alexandrecouture2462]

Are you really sure about the fuel pressure being 10 bar? It is about 145psi. On most cars, the injection rails are at about 30-40psi and whatever would make the pressure higher simply returns to the fuel tank. So, no pressure above 40psi should be seen in the fuel lines. Anyway, I agree that this little plastic filter is a fire hazard.

[@LivingWithAClassic]

The fuel pressure is regulated at 32 psi however most fuel injection pumps are rated for about 10 bar out of them. Not saying you’ll see that pressure normally but if something fails you could

[@alexandrecouture2462]

@@LivingWithAClassic Maybe in the situation where the fuel regulator would stuck closed it could potentially happen.

[@MrScottCorboy]

I can confirm that on an XJ12C if you have a fuel tank return valve stuck closed, you will get over 120psi in the rail, so the pumps are pretty strong. Not recommended operating procedure.

[@craigjaguar]

I'm actually going through the exact same strip down and refurb of my HE V12 at the moment! One thing I'm surprised at is the cost of the fuel hoses that feed the fuel rail on the HE cars - very expensive! Over £100 per hose!

[@LivingWithAClassic]

Get a kit from mr.injector in the UK. You can then make your own hoses for the feed and return with them. Did that on 3 HEs last year. Great kits

[@craigjaguar]

@@LivingWithAClassic ahh excellent advice, thanks Adam! Never ceases to amaze me as to how much strip down is required on a V12 even for basic service work - I would recommend while you have yours stripped down to do the coolant rails and gaskets as well! I've seen some people refurb these with polished copper pipes and they look great

[@LivingWithAClassic]

I plan to do that also and possibly get the pipe plated so it all looks nice again. Yes it’s a lot to stop down but once it’s done a lot shouldn’t need to be touched for a very long time

[@neilcussons4744]

Shouldn't have run Adam, love your channel btw.

[@LivingWithAClassic]

Still trying to figure out how it ran. Thank you! I’m glad you like it

[@neilcussons4744]

Just a small English correction Adam😊

[@LivingWithAClassic]

Ah I see, thank you!

[@aretardridesmotard6128]

Adam an XJS that had suffered a fuel injection fire came up for sale in my city not long ago. It was immaculate apart from that. I came frighteningly close to selling my 420 to fund it!