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[Marks DTM Calib]

Correct....also give a thought to what happens if the common rail pressure is low.....

If the pressure in the rail is low, then there would be a reduced (or intermittent) feed of fuel to the individual injectors?

Sort of.....as the injection phase starts just before TDC.....the fuel starts to enter and as the compression increases, the fuel flow can drop to xero (due to low rail pressure).....so hence you get less fuel than requried in....

Whats was teh stored codes....low rail pressure per chance?

[JamesV6CDX]

I will be reading the codes tonight, this is the first step I will do in the diagnosis.... 

If it is fuel pressure low (which I understand is common) what is the cause / fix?

Bu66ered/tired pump?

I have wondered if at any time, the car has been mis fueled  :-/

[Sir Popple]

I will possibly get shot down for this, i believe there is a sensor that listens for the pinking noise under the bonnet, if this registers it should alter the timing. I know this is common on Large GM Diesels in The States

[JamesV6CDX]

I will possibly get shot down for this, i believe there is a sensor that listens for the pinking noise under the bonnet, if this registers it should alter the timing. I know this is common on Large GM Diesels in The States

You mean a knock sensor?

Not sure the HDi has one...

Thanks for the input though - ANY comments gratefully recieved 

[Sir Popple]

No, But if as you say you are doing a test then if a sensor is faulty then hopefully it will show up......
Does it only do it when the engine is under load?
Have you ever heard of the Diesel Bug? We get it a lot over here in the winter, due to Bad Diesel storage. I am for ever having to clean fuel lines and filters for customers.

[Seth]

No, But if as you say you are doing a test then if a sensor is faulty then hopefully it will show up......
Does it only do it when the engine is under load?
Have you ever heard of the Diesel Bug? We get it a lot over here in the winter, due to Bad Diesel storage. I am for ever having to clean fuel lines and filters for customers.

Yes, but could the problem be inferior quality diesel?

IME, a 'sharpish' sounding CI engine was usually down to over-advanced injection timing. So could it be that the system, therefore, is over-compensating for poor quality/contaminated juice?

[Marks DTM Calib]

I will be reading the codes tonight, this is the first step I will do in the diagnosis.... 

If it is fuel pressure low (which I understand is common) what is the cause / fix?

Bu66ered/tired pump?

I have wondered if at any time, the car has been mis fueled  :-/

Buggered pumps on the pugs are all to common.....and often results cars the age you have being scrapped or shifted on for low cash.

[Debs.]

Yes they can, if, as has already been said....the pump timing is wrong.

Agreed; indeed they can be over-advanced and it makes a horrible noise!
My old landy has a vertical diesel pump (looks like an old -fashioned distributor)....altering the effective timing by revolving it relative to the timing mark has a profound effect on power-output, smoke, noise and engine-heat.
Diesel timing can be tricky to set-up and catastrophically destructive if left in a badly timed condition.

[hoofing it]

I'm going to get ripped to bits here but would worn valve lifters not cause a pinking :-/

[Seth]

Yes they can, if, as has already been said....the pump timing is wrong.

Agreed; indeed they can be over-advanced and it makes a horrible noise!
My old landy has a vertical diesel pump (looks like an old -fashioned distributor)....altering the effective timing by revolving it relative to the timing mark has a profound effect on power-output, smoke, noise and engine-heat.
Diesel timing can be tricky to set-up and catastrophically destructive if left in a badly timed condition.

Ah - the old DPA pump, vertically mounted!
Could be 'touchy' things those, slightest contamination of the fuel, and they'd stop on you. More often than not, it was then over to our pump shop for a replacement!