XSeries-forum

XK8 wrote: ↑Sun Jan 13, 2019 1:16 pm Hi, I have an 2007 3.0SD, I have had it for around 3 years now. I’ll try to answer your Q’s according to my experience with the car and the mods / maintenance that I have carried out. I’m fortunate to be able to share my driving between two cars, a Jaguar XK8 in the summer months and the X3 in the winter months, the jag does not like the taste of salt. So only do around 4000 miles a year in the X3.

1:- I’m running the 19 inch rims with the staggered star rated Pirelli’s, very expensive, but cheeper than a transfer box rebuild!! I fit my 18” Dunlop winters once the temperature drops. I have no knowledge of 17’s, but I suspect it will not looks as nice, I love the stance on 19’s
2:- EGR. I removed my EGR last spring time and fitted the straight through equivalent, to be honest I have not noticed any mpg or other improvements, but I’m happy they the engine and turbos are not ingesting the exhaust gasses any more. I have not had an mot since, but as the egr is under the engine cover I suspect all will be fine as it will not get spotted.
3:- FLAPS. This was the second job I did, as I read horror stories about flaps dropping into he engine, all the flaps were fine on my intake manifold and had the upgraded version, I still blanked them off. Again, no noticeable differences but piece of mind.
4:- Stats. This his was the first job, but do this at the same time as the swirl flaps, as it’s all in that area and the intake manifold and egr has to come off to change the thermostat’s. there are indeed two stats, an egr one that is no longer required on mine as I have no egr and the mail engine stat.
I was getting low temps, 70 -75, up to 90 - 95 now. B T W, according to information I have read, the DPF will not regenerate if the engine temp is below 75, so you really need to get this done.
5:- I’ve changed the transfer box oil only so far as it was recommended by numerous posts on the interweb and was easy, I plan to do the diffs next spring / summer. The g-box is super smooth so I’m not planning to have this done as yet. The transmission oil change, if carried out wil get done by my local transmission shop who have a power flush system, this apparently gets all the oil out, therefore a complete oil change, as lots of the oil sits in the torque converter.

I have also changed all the glow plugs, as three were duff, according to the fault codes, also the glow plug controller. This also impacts the regen process of the DPF.
All the pads, discs and guide pins on he callipers.
New battery.
I’ve recently had the ECU remapped by Superchips, apparently I’m getting around 350bhp now, it was fast before, but now, good lord it really pulls. The MPG is suppose to improve, but I’m having way to fun with the right foot just now.

MPG is mid to low 20’s on short runs and mid to low 30’s on long runs, (cruising at 70-90) which is disappointing as I was expecting a bit more when I purchased it, but smiles per mile are plenty. We took it to the Dordogne region in France last year (1200 mls) in preference to our other cars and it performed magnificently, apart drinking from lots of fuel.

As you mentioned @jagr also,has an SD, his posts helped me when I first got mine, as he had discovered all the same problems that I had and solved them before I had too.

Thanks XK for the detailed response - all very helpful and great to know what order you are doing things in. a couple of follow up questions if I may:
1. very interesting about the glow plugs - hadn't thought of that but makes sense. I havne't got my diagnostic kit yet - did you run the diagnostics yourself? If so which software and if you don't mind me asking where did you source it as there's so much out there it is truly confusing. (you can PM me if you prefer).
2. very useful heads up on doing the swirl flaps at the same time. as I don;t have repair manuals yet I hadn't yet seen the logic of that so thanks again. Did you do the stats and swirl flaps yourself ? How long did it take you?
3. Where did you source the blanking kit? Which size of blanking plates does it take?

Thanks again. Much appreciated. I will try to post my findings too once I embark on it.