Some time ago I ran trough all the functions of my IID tool on my Td6.
One of the functions I tested was the cylinder fuel pressure. Here are the numbers:
Cyl 1: -2
Cyl 2: 3
Cyl 3: -3
Cyl 4: 1
Cyl 5: -1
Cyl 6: 1

I don know what I'm looking at, but I should say they must be pretty same?

Car rans fine (cold and hot), starts immediately.

What does 'cylinder fuel pressure represent' ? Does it say something about injector health? fuel pump? or cylinder wear?
And what does the difference between these numbers indicate?

Thanks for your help!

More commonly referred to as "Injector Fuelling Compensation"

Measured in cubic mm's (mm³) it is measuring how much extra, or how much less fuel is being injected into each cylinder. Usually used to determine which cylinder is misfiring

Values of +1-2 are common, +3 should be monitored, and anything higher should be investigated, though you would likely feel a misfire at this point

99 times out of 100, it is a faulty injector. Less likely is a wiring loom issue, and even less likely is a mechanical fault with the engine, causing low compression

Hello Mikey,

Thanks for your explanation!

Why is this compensation for injecting less or more fuel? Is it compensating a bad injector? and is a minus or a plus figure worse?
So i should keep an eye on it and see that cylinder 2 isn't going to get worse?

Positive figures are over fuelling, negative is under fuelling.

Generally speaking, negative figures can be ignored is most cases

The higher positive figures are from blocked/faulty injectors. The Engine ECU sees a "crank speed" on each cylinder. A lower tHan expected reading sees the ECU allowing in more fuel, hence the higher compensation figures

Monitored this morning. Cyl. 2 still has 3 and jumped incidentally to 4 and immediately returned to 3 again.

When revving up to 1500 or 2000 RPM all equalled at 0.
So is there a reason to worry? Since revving (and thus driving conditions) there is no difference at all between all cylinders.
Need to know if can go on holiday (2500 km) next week without making things worse or even get stranded?

You may find you will have a slight misfire at idle at times

You can the some injector cleaner, that may help things

Hi Mikey,

Thanks again for your help!
So I understand that there is nothing to worry about when all are zero under load?
Going to use that injector cleaner anyway!

Update on this one. Finally got to replacing injector no. 2 Because injector cleaner wasn't doing anything. With only covering 3000km in the past half year the value of no. 2 increased to +4. So replacing seemed the best option. Fitted new (overhauled by Bosch) injector (came out really easily ). Value on no. 2 is now +1 and all others are now on -1, 0 and +1. So everything seems back to normal

This was from mine when it was faulty and had injector and HP issues
http://www.fullfatrr.com/gallery/albums/us...elling.pdf

I can try and get current readings but im sure an injector is leaking again from the small amount of smoke i get from where its parked up a few days  FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

interesting table.
Is this doen with IDD tool? Can't recognise these figures.

Wondering what is wrong? engine speed 241 RPM and battery volts at 9.4

Sorry thats cranking and with the bbs faultmate msv2  FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

that makes things clear so no very slow running car

No 😂😂

I'll get a proper disc done at some point as it should be on here for reference for others really FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.