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[dieseldean]

does a new fuel pump need mapping to ecu???

[Auto Addict]

Not sure, but I think it needs priming.

[dieseldean]

 ::)silly me doesn't need mapping. if can change a full engine with pump attatched and not re need remap then dont need remap a fuel pump alone

[Omegatoy]

hmm dont forget although pumps have same fitting and mounting the management systems will not run the other type of pump? just an idea but it may give you a clue? take it you have fuel up to injectors??

[dieseldean]

all back together now but running sicker than ever.
engine will start and run but not without accelerator being pressed.
pump is knocking noisy and there is a dragging sound which sounds a bit like dry metal rubbing dry metal. i think fault is now the timing chain being very slack.
paperclip shows
41 boost pressure voltage low
81 sensor injection start short or open circuit (which is the fault that been trying to cure)
88 air mass flow sensor voltage high
92 cruise control device circuit open or voltage high (set up for cc but only standard indicator stalk)

fuel supply has no air leaks and lift pump in tank ok. filter and housing replaced. all 6 injectors replaced, fuel pump replaced. no breaks in any wires.

any ideas anybody or does it sound like a nasty timing chain job :-/

[philhoward]

Sounds like a lack of fuel to me...my theory is:

Code 81: Not enough fuel pressure to make the sensor.  Due to insufficient fuel,
Code 88 - fuel/air ratio wrong (too much air - signal too high).  Due to insufficient fuel and air (in the right quanitites),
Code 41: Boost pressure low (not enough to spin the turbo).

The CC one is self explanatory...

Have you tried cracking the injector unions to check fuel there?

There could be 101 other reasons though - just my first thought...

[Seth]

Hi Dean,

First, when you removed/refitted the pump, was the keyway in the tapered pump-drive at the top, ie. facing upwards?

Secondly, I'm told that the pump-drive sprocket has to be held in place with a special tool whilst the pump is off the engine. This keeps the timing-chain 'in tension' during the removal/refitting process.

Sorry, but this is all I can offer at the mo.

[Omegatoy]

would agree with dean,sounds like the timing chain is slack, guides worn etc, all replacable and the engine is one of the easiest diesels to time up, front comes off fairly easily but new guides and  chains are pretty expensive but available form bmw or landrover etc mayb e even vxhall?

[dieseldean]

project closed until next weekend chains,guides and tensioners to be priced up.
i'm very lucky that a friend who can't drive for medical reasons has given me keys to his pajero which i can use until he back at work again.