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Messages - tunnie

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136
General Car Chat / Re: Proper Motor
« on: 23 September 2019, 10:37:42 »
Certainly the misfire at cold start with coolant loss is indicitive of water getting in the cylinder/s :-X
Surely that would lead to excessive pressure in coolant system, seeing as cylinder pressure are way more than coolant pressure.


it's showing exactly the same symptoms mine did.
Whenever I solved the external leaks(cap, expansion tank and top hose) the leak got worse.
I was resigned to changing the head gaskets, and got the parts together. By the time I started the job, more steam than normal was visible in the exhaust gases as it warmed up. But it wasn't pressurising the cooling system as much as blown head gaskets I had seen previously.


Removing the O/S head revealed a rotten gasket that was the cause of the leak, and a nicely steam cleaned piston. The other side was in a similar state, but wasn't showing signs of leaking.


If it isn't leaking externally(which can take some time to prove) then it has to be internal.

This also matches, my nice clean spark plug, which is really shinny compared to the rest!

137
General Car Chat / Re: Jaguar XF
« on: 23 September 2019, 10:12:06 »
It appears the X250's in 3.0-S trim around 2012/13 vintage, go for same amount of cash as 2016 X260 2.0's.

Given later 2.0's will be as punchy as my current 3.2, wonder if the 6 pot is needed. Think some test drives are required!

138
General Car Chat / Re: Jaguar XF
« on: 23 September 2019, 09:52:30 »
It’s a 2011 facelift XF 3.0. V6 diesel portfolio beautiful car.
Methinks his fuel computer is telling porkies, as no way will he get that sort of MPG unless driving everywhere at 50mpg.

My XJ - same engine, same weight - averages 32.5mpg over several tankfuls. Manually calculated, as the fuel computer is worse than a cheap watch.

But the wrong gearbox.....the 8 speed makes a massive MPG improvement (as it has the extra 2 cogs plus the ZF8 also locks the torque converter in every gear).

Was this fitted to X250?

139
Omega General Help / Re: Coolant leak
« on: 23 September 2019, 08:05:27 »
I'm going to throw another one into the mix, as per my old blue prefacelift....weeping core plug.
From memory what you have is not far from what I experienced.

Thanks.  :y  How was it diagnosed/tracked down?

140
General Car Chat / Re: Budget V8?
« on: 23 September 2019, 08:04:30 »
Hummm. Tempting!

141
General Car Chat / Re: Proper Motor
« on: 23 September 2019, 00:15:11 »
was the water pump leaking when you took it to serek ? or the rad ? or what ?
back then you had a visible leak which I assume was resolved and the minor coolant loss is proving hard for you to find ?

No leak found...

142
General Car Chat / Re: Proper Motor
« on: 22 September 2019, 23:12:19 »
I agree on coolant loss to pressure, as on slow run to work it empties half it’s headed tank, yet runs sweet as a nut and no excess pressure

143
General Car Chat / Re: Proper Motor
« on: 22 September 2019, 23:08:47 »
Sounds like you need to pressurise the cooling system cold and see where it leaks.

I wouldn't be worrying about the head gasket until you've completely eliminated the radiator (passenger side tank seems to be most common area), radiator drain valve, HBV, water pump, oil cooler cover plate, heater matrix and all the rubber hoses for starters.

I also fail to see how you can have enough water leaking into a cylinder to get a misfire yet it's not immediately blowing the pressure cap under load. Sure you haven't got a leaky scuttle dripping water into the plug wells?

No it’s not the scuttle, it miss fires after staying in a dry car park after the run to work. I’ve checked Coil pack areas, all dry. Plugs removed on 1-3-5. Plug 1 is very clean compared to rest ( see my other thread )

Serek pressure tested cooling system when he had it for a couple of weeks, he said it was fine with no leaks.  :-\

It was loosing coolant when I took it to him, with same misfire problem.

144
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 22:06:26 »
He loves his car and when I told him his mpg was being questioned this was his response ......

My E92 330d would average mid 30's around town but could easily achieve 48mpg on a run. Figures are real world miles travelled from empty to full to empty again. That thing would go from my house to a place we stay in Cornwall and back on a tank, a round trip of over 526 miles, and I don't hang about. I loved that car, it had a cracking engine.  :y

How did you find the ride?

145
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 21:48:07 »
What’s belt interval on these?

146
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 21:35:55 »

147
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 21:32:05 »
I am very tempted by XF-S, but concerned on reliability and my ability to service it.

148
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 20:54:42 »
He loves his car and when I told him his mpg was being questioned this was his response



Right let's have a bet then tomorrow I will be driving 350 ish miles I will reset when I leave my house and video the reset and video the trip computer reset then when I finish up at carlisle we will see what average I've got

I think the point here is that the computer is not accurate.

He should do it old school way of brimming tank before and after and crunching numbers that way.  :y  :y

149
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 20:19:51 »
It’s a 2011 facelift XF 3.0. V6 diesel portfolio beautiful car.
Methinks his fuel computer is telling porkies, as no way will he get that sort of MPG unless driving everywhere at 50mpg.

My XJ - same engine, same weight - averages 32.5mpg over several tankfuls. Manually calculated, as the fuel computer is worse than a cheap watch.

Rarely agree with you, but on this occasion we are aligned.

I would be expecting low to mid 30’s at best from V6 diesel, mid 40’s with 2.0 latest XF.

150
General Car Chat / Re: Jaguar XF
« on: 22 September 2019, 19:50:15 »
My son has one, eight speed box and goes very well, unbelievable on fuel returning 46 to 50mpg on a run without driving like miss daisy. The have a couple of faults one being they often crack inlet manifolds (especially if they’ve been remapped :D) but a lovely ride with all the toys and looks to match and a sure bargain at that price.  Timing belt change at 105,000 or 10 years, mind you would be braver than me to take a chance!

Thanks.  :y

What age/spec?

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