V6S Break Down

Technical Advice, Faults and How-To Information.
LordOxton
Posts: 6
Joined: Sun Feb 14, 2021 7:23 pm
Location: Oxton, Wirral

Post by LordOxton »

Being the diligent sort of chap that I am, my V6S was recently treated to new gearbox oil & sump, new diff oil and new supercharger oil.

The gearbox oil was sourced from Smith & Allan (£6.65/l), the ZF sump from Autodoc (£64), the diff oil from the Jag dealer (£35/l) and the supercharger oil from Powerhouse (£24).

Not only does this represent a *huge* saving on Jag prices, Jag won't sell you any oil for the supercharger on the basis that it's sealed for life. Eaton beg to differ, as I'm sure you all know.

Anyway, the work was carried out by my local Jag specialists who looked after my E Type for 20 years. They were happy with all of the lubes & parts I supplied. Trust me, they double-checked everything.

So, there I am on a sunny day with the roof down after the work has been done...all of a sudden...strange noises and lots of smoke...oh no!!!

I quickly pulled over, the car was recovered back to my house, my mechanic mate's diagnostic machine was attached and misfire faults were reported on cylinders 5 and 6.

Coil packs or injectors were suggested by 'those in the know'. OK, I'll start with the basics and check the plugs while we're in there I thought. What a pig of a job!!!

This is what they looked like:

download/file.php?mode=view&id=7559&sid ... c85c95bd25

These plugs were changed at 42k miles by a Jag dealer according to the service history. That would suggest they've done 16k miles.

Anyway, I changed the plugs and *nothing else* and the car is running fine again. Who'd a thunk it!

Lesson : assume nothing about the work that has supposedly been done in the past...

plugs.jpg

Current : 2015MY F-Type V6S convertible
Former : 1972 E-Type V12 FHC, 2006 XK FHC

NavigatorNI
Posts: 443
Joined: Wed Nov 25, 2020 10:11 pm
Location: Northern Ireland

Post by NavigatorNI »

Whew, glad you got it sorted so cheaply. I'm sure you were worried for a while!
V6S Coupé, RWD, MY16
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LordOxton
Posts: 6
Joined: Sun Feb 14, 2021 7:23 pm
Location: Oxton, Wirral

Post by LordOxton »

Very relieved, especially as I paid a lot less than the £110 Jag want for the NGK plugs...handy to have mates in the trade :-)
Current : 2015MY F-Type V6S convertible
Former : 1972 E-Type V12 FHC, 2006 XK FHC
gasgas
Posts: 476
Joined: Mon Apr 30, 2018 6:55 pm
Location: Devon

Post by gasgas »

that's why I always use a local indie, as they appreciate your business.
CJSJAG
Posts: 147
Joined: Sat Mar 27, 2021 2:16 pm
Location: Massachusetts, USA

Post by CJSJAG »

What do you think was wrong with the plugs?
They do look very smoked up as though your engine was running rich, but would that alone cause your breakdown?
As a novice, they do not appear "worn out" to me.
Would appreciate any insight you may have.
2021 R-Dynamic P380 Convertible BRG
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Lunar
Posts: 1991
Joined: Wed Apr 26, 2017 9:02 pm
Location: Frimley Surrey

Post by Lunar »

Did you have the injectors ultrasonically cleaned and inspected for hairline cracks at the same time?
I’d be somewhat wary if not - hopefully if needed your contacts have good access to injector removal kit too.
They used to be sold in kits but now are only available singularly. If you know of a cheap place to buy them it could be of use to others now mileages are building.
MY14 "S" badged V6 Convertible in Lunar Grey metallic
Performance seats, Meridian, heated flat bottom wheel with aluminium paddles, heated front screen, cruise, dual zone climate, switchable active exhaust
LordOxton
Posts: 6
Joined: Sun Feb 14, 2021 7:23 pm
Location: Oxton, Wirral

Post by LordOxton »

I did nothing apart from replace the plugs.

I was going to move onto testing the coils next, and then the injectors, but it make sense to only isolate one thing at a time.

The plugs were supposedly replaced at 42k (16k ago) but I felt it was important to check them to rule them out.

There have been no faults reported since then and the car appears to be running fine.

Fingers crossed...
Current : 2015MY F-Type V6S convertible
Former : 1972 E-Type V12 FHC, 2006 XK FHC
cj10jeeper
Posts: 1913
Joined: Sat Apr 15, 2017 8:37 pm

Post by cj10jeeper »

Well I hope you’re right and it was plugs, but doesn’t feel right to me.
All the plugs look about the same and don’t look worn out, but difficult to tell on an iPhone.
Wouldn’t be surprised if a fault reappears soon.
2014 MY 3.0 V6S Roadster
Subtle enhancements to create the car I wanted from SVR nose cone, 400 series side skirts & customised 'design' rear bumper, to heated SVR steering wheel and more
LordOxton
Posts: 6
Joined: Sun Feb 14, 2021 7:23 pm
Location: Oxton, Wirral

Post by LordOxton »

I agree, hence fingers crossed...
Current : 2015MY F-Type V6S convertible
Former : 1972 E-Type V12 FHC, 2006 XK FHC
CJSJAG
Posts: 147
Joined: Sat Mar 27, 2021 2:16 pm
Location: Massachusetts, USA

Post by CJSJAG »

Not being one to pke around inside mt new F-Type for no reason, I have no idea how easy it is to check the plugs.
BUT, if not too difficult, I would suggest you pluu the plugs again and check to see if they are smoked/black again.
Unless some thing has chnged since I did used to mess around with engines, they should be grey/white - not black.
Black would suggest a fuel problem, posible as suggested, your injectors.
2021 R-Dynamic P380 Convertible BRG
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