A good 'result' - but bizarre 🤣 Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 151,000 miles & now sold
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

Used the RR all weekend and it seemed to have begun reverting back.

The only things that changed was I put fuel in and the also the weather got warmer (up to 10-12 degrees)

The ride has become hard and bouncy again, the engine lethargic and laggy and the steering weighted up again but perhaps not as heavy as it was previously.

Same old story time and time again.

Oh well, it was nice whilst it lasted!

Steering back to being 'ok' today (not perfect but not terrible just manageable)

Suspension sort of ok.

But the engine today, delay on acceleration from a stop, lethargic and laggy in gear performance, slow to rev.

Honestly feels like the crankcase is full of treacle.

Swapping back to my usual daily drive tomorrow.

Okay so this RR is doing something different to all the others.

Jumped in it to do a tip run tonight, temperature outside around 6 degrees.

Steering was lighter again, engine felt better and the suspension had some give again.

Seems that colder ambient temperatures help alleviate the symptoms.

Strange

That is weird!
If the suspension was going to change at low temp, I would always expect it to be stiffer as the dampers fluid viscosity increases. Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 151,000 miles & now sold
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

Tyre presures are lower when cold than when hot.

I agree Pawl, I also agree Graeme.

I think there's a contradiction in there though as lower tyre pressures in colder ambient temperatures would help the ride a little bit but I'd expect they'd make the steering heavier too.

The steering is however, lighter

Cold makes the tyre compound stiffer which may cancel out or even over compensate for any pressure loss. Also I have found higher than stock pressures give me a better ride quality which maybe has to do with how tyre compliance interacts with velocity signals sent to the CVD ECU? Your drivability issues also sound like a leaky EGR valve and in cold weather the EGR valve opens less as I found recently when my average regen interval went from 80 to 560 miles and the EGR valve never opened more than 10-20 %.Worth checking the EGR error value and the difference between comanded and actual opening values . Mine seems to have a 4-5% error i.e the actual position is higher than the commanded. I'm now seriously toying with an EGR software delete. 2012 TDV8 Vogue (L322)

Interesting information Jaygee, I'm sure the tyre and it's pressure do effect the way the CVD module will control your suspension.

Luckily that isn't an issue on this l322 as it's a 2007MY so no awful CVD.

I've already installed physical EGR blanks but they are not mapped out in software.

It does feel like how I imagine it would be with a stuck EGR, I.e holding back/choked back but obviously this isn't possible with blanks installed as nothing but fresh air is going through the intake.

Came to work in the RR this morning, suspension stiffer again, engine OK ish and steering ok ish.

This car seems to change how it drives constantly, it can be quite enjoyable when it's going good.

Gives me some hope that maybe this car will be different and I'll succeed in getting it 'right'

I was assuming it was a late L322. No idea why the suspension should be stiffening up on a non CVD car or why you are getting drivability issues with blanked EGR valves other than the usual air leaks which cause similar issues. If you have a GAP IID tool it's worth checking the air intake temps and charge intake temps to see if they are 'plausible' Both MAF's I assume have IAT 's on them and should read the same and lower than the charge intake IAT. 2012 TDV8 Vogue (L322)

Probably because I've made all these complaints about 2 later L322s before Jaygee

No idea re the suspension either, there's no electronic control. Probably just knackered shocks on this one.

No air leaks as far as I'm aware, already looked at the live values you mentioned and yes all are plausible and the intake air temperature is indeed less than the charge air temperature as one would expect.

Maybe worth doing the EGR software delete anyway through the GAP tool add-on as it's a wise move anyway to protect the turbo's 2012 TDV8 Vogue (L322)

It's something I plan to do Jaygee but sadly I haven't an IID tool at the moment.

I sold my last one just before I sold the L405.

I'll have to either pick up another or go to someone capable.

A thought that crossed my mind, when I did the power steering fluid replacement I used Smith and Allan cold climate fluid.

Should I have used genuine and 'cheaped out' ?

Okay so this just gets more and more confusing.

Today I removed the original servotronic valve and fitted the spare I have. (Just out of interest to see if the steering behaviour changed)

I also drained out all the smith and Allan cold climate fluid and replaced it with genuine LR cold climate fluid.

On the test drive I had almost perfect steering!

Here's how I would describe the way the RR was driving. 0% = totally broken, 100% = operating perfectly in my opinion:

Steering: 90%
Suspension: 80%
Engine: 75%

I then parked the car up for half an hour, 40 mins top.

On the next drive:

Steering: 70%
Suspension: 50%
Engine: 40%

I can't fathom how it can change so much after being parked for just 30 minutes.

Any thoughts?