xantia HDI fuel consumption

[rory_perrett]

Mid 30's is low but as most have said it depends on a lot of variables. Your mileage is all town work then sub 40 is quite possible without racing away from the lights. On a run 50+ is where it should be. As a quick check make sure your brakes aren't sticking and that the tyre pressures are right. The colder weather (and possibly winter diesel) drops my average about 6%.

[isisalar]

Northern Mike you are a star. PM coming.
Cheers
Paul

[Northern_Mike]

And PM on it's way back Paul....

[Rhothgar]

No room to nail it round here

You say that buy what I am referring to is revving above 3000rpm in any gear off the mark.

HDi engines are not as forgiving in my experience as TD's.

I've had 59.5 on a run and also recorded 47mpg on same journey. No perceptible change in driving style.

I recall 59.5 was at an indicated 70mph (65-66mph) and 47 was at an indicated 80 (75mph) or vice versa.

[c.morewood]

As mine is off the road with suspension problems.. (see the other threads) I thought I'd get under the rear end as she's sitting high on jacks and do some maintenance.
I started off by looking at the rear brakes and found that both had been suffering from the effect of corrosion behind the brakes up to about 3mm which has the effect of pushing the brake onto the disc, obviously slowing the car down and using more fuel.
In fact one brake pad was so bat that it was effectively welded to the back half of the brake. It took a good 20 min of struggling trying to break the pad away and not break the pipe.
That may part of your problem and easily checked by lifting the car on its jack and spinning the wheels.

Chris

[isisalar]

Thanks for all the interest guys.C.morewood- Been there, done that, with the rear calipers(on the TD), no brake binding here. In fact it passed its mot 2 weeks ago, only advisory was wishbone bushes.
Rothgar- very rarely exceed 2000 rpm, gearing is so long it's rarely necessary. IIRC 2000 in top is about 70mph.
The remainder of the fuel seems to be nearly gone at about 150 miles. Having given it a bit of welly yesterday , I could smell a spirity smell when I got out of the car, not diesel, a bit petroly, but obviously not petrol. There is no smell in the cabin whatsoever. I'm wondering if it could be the Diesel/cleaner mixture I smelt leaking somewhere between the tank and the engine bay. After I've done a temporary fix on the Saxo's exhaust which gave way yesterday, together with the house boiler also breaking down, I'm going to give it a look. Are there any likely suspects for a fuel leak in the line?
One thought that's just occurred to me is, could the minor 'stutter' which occurs after a couple of minutes running, and then clears untill the next cold(cooled down over time) start be indicative of a bit of air getting in where the diesel is getting out?
Would a Lexia show up any such leak?
After I cleaned the maf a few weeks ago the EML light came on for about 10 mins on the first long run and it went into limp mode but this soon cleared and all has been well since. Would the reason for this be read by a Lexia?
Wish me luck, going to wrap up warm, grit my teeth, and get on the ground for the afternoon, lovely way to spend Easter Sunday.
Kind regards all
Paul

[isisalar]

SUSSED IT. Well done citroenxm for pointing me in the right direction. Popped off the engine cover and sure enough the third injector to the right looking from the front is puffing out regular bursts of smoke/vapour and is surrounded by pools of diesel.
It looks like a straightforward tightening up job to seal it, but given my luck this weekend it probably isn't. I have no experience with injectors at all so i really need some help here as to how to proceed.
Spanners at the ready.
Kind regards
Paul

[electronmirror]

Paul,

About 4 years ago I had a similar small pool of diesel around one injector. A very gentle nip up of the feed pipe cured it. You will need to be careful.

The puffing vapour from around the injector suggests the clamp holding it down may be slightly loose or a failing flame washer (copper?) under the injector (can't remember if there is one on the 2.0 HDI). Again a gentle nip up might be all you need.

[c.morewood]

Have a look when the engine is running to see if you can see where the puff is coming from.. It sounds, as Ted suggests, as though you've got a leak on a feed pipe.. see if you can see which end its coming from.. don't put you hands anywhere near the leak as its very high pressure.
I'd unscrew the two nuts on the pipe just to check that its not seating on a bit of dirt, causing the leak, give them a wipe down and then re attach the pipes.
If you're getting a "chuff chuff" sound, chances are that the firewasher seal at the bottom of the injector has got air coming past it and will need the injector taking out and cleaning the bottom of the injector shaft in the cylinder head and also the firewasher cleaning and removing any dirt.
They're very easy to remove and replace 45 min should easily do it. I was like you and hadn't touched the injectors till a couple of months ago and then citroenxm helped me out on this forum... It really took less than 90 min from start to finish cleaning each injector along the way. I did however get new firewashers and guides before starting and replaced the old ones with new ones.

http://www.ebay.co.uk/itm/PEUGEOT-CITRO ... 48528bb44f" onclick="window.open(this.href);return false;

Or just the single firewasher
http://www.ebay.co.uk/itm/Citroen-Peuge ... 2a2a374ad0" onclick="window.open(this.href);return false;
I sprayed some Brake cleaner down the injector shaft and that cleaned it out pretty well...
Good luck,
Chris

[isisalar]

Excellent! Not too difficult or expensive
I've had a good look and the feed pipes look ok, the vapour is coming from under what I would say is the body of the injector below the clamp so the washer looks like the most likely culprit. If it's that cheap and easy I'll do the whole lot.
Is there a link to the thread that helped you Chris?
I am a very happy man this evening, thank you so much for all your help guy's.
Is the BOL any help here?
Kind regards
Paul

[c.morewood]

The 8v HDi IS the BEST HDi engine EVER.. even to work on!

The injectors are on the front of the head, with NO manifolds in the way, both are down the back out the way..

Unplug the injector electric plugs, remove the two 10mm nuts holding the harness above the injectors and move it to one side..

No.4 is at the cam belt end im sure... (left most injector looking at engine) remove the high pressure feed pipe 14mm spanner I THINK, then you will see the injector is held in place by a clamp held in place by one 13mm nut.. remove the nut and as long as the fire proof seal and washer is in good order the injector should lift out.

I find I have had to use a Mole Grip and just twist the injector side to side while lifting, and lift the clamp at the same time... but they are litterally a press fit and clamp in place!

With grateful thanks to citroenxm Paul

[isisalar]

That's fantastic, thanks c.morewood and citroenxm for that quote/post, sounds like a doddle, we shall see.
Ordered the full set of seals and washers today and they should be here for the weekend. Working very local this week so not going to waste too much diesel before I'm enjoying the 50mpg+ milage I was expecting, and will save enough to invest in a hydraflush and new centre sphere very soon.
Just two more questions please:-
Is there any residual pressure in the fuel lines to be wary of, with the engine off?
Is it best to remove the injectors with the engine hot or cold?
Cheers
Paul

[c.morewood]

Warm engine... not hot and leave for 5 mins after switchoff to allow pressure to dissipate.
Good luck.. not that you'll need it,
Chris

[Rhothgar]

At economical motorway speeds, I am not sure it would make 20+ mpg difference!

Binding brake, that is!