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[Turk]

I have a strange juddering (similar to being in the wrong gear) between 1,500 rpm and 2,000rpm. It's always been there very slightly but after chipping the ecu it is now much more noticable.
I have done the "Diesel Magic in the filter" trick and checked all pipework. All is in order.
I'm thinking it's an injector issue, in particular the sensor injector.

When I raise the revs slowly and hold between 1,500 and 2.000rpm, the MPG display changes from the current average mileage and just shows the letter "F" on the L/H side where the MPG was showing. This only happens when holding the revs in that range. Fine below and above and the "F" does not appear when driving.
The car revs freely with no glitch and the only indication there is an issue is the juddering in the previously mentioned range when driving.
EML not on.
 
I have a spare sensor injector on my Elite, but to get this off I need a narrow 27mm deep socket (not an Impact socket, they are to chunky to get down into the injector).
I don't want to grind down a 27mm impact socket to fit if it is not an injector issue anyway.  

Any ideas whether I'm on the right track with thinking it may be an
injector issue ?

[TheBoy]

If it was an electric issue with that needle lift sensor, I would suspect a fault code stored...

[Turk]

Is the 2.5 tractor (f/lift '00) paperclippable for this ?  

[TheBoy]

Is the 2.5 tractor (f/lift '00) paperclippable for this ?  

some are, some ain't...

[Omegatoy]

is it a juddering you can feel through the car when accelerating> if so check very carefully the following,
rubber donuts either end of the prop
prop centre bearing rubber
gearbox mounting rubber has not parted company with it metal plate
as you see i suspect its not engine related but the rev range you have indicated is just where the turbo starts producing torque,if it was an injector issue you would indeed have a fault code clue is its aways !!!been there!! but your now making around 350torques as opposed to vxhalls 250!!!

[Turk]

Does not happen under acceleration. Juddering only occurs between 1,500 and 2,000 whilst driving. Feels like a learner driver has shifted into 5th instead of 3rd gear.  

What is this "F" that appears in the Average Mileage display when I hold the revs between 1,500 and 2,000 ? (at a standstill only, no "F" appears when driving)

[Omegatoy]

Hmm, am thinking on this one then!!!

[Turk]

Just driven back from my sisters and took note of the juddering issue. It judders between 1500rpm and 2000rpm, where it subside and is gone by 2300rpm.
No "F" showing when driving and revs held in the juddering range, but it appears when revs are between the problem points, out of gear at a standstill.

Doubt it's a transmission issue caused by the increase in power as it is even more prominent when decellerating.
Disengaging the clutch does not stop it instantly, only stops when the revs drop (or rise) out of the judderig range.  
This judder was there before chipping but nowhere near as prominent, in fact it wasn't even an issue, just slightly noticable.

[Turk]

Paper clip test gives:

64: Fuel Quantity Control out of range

96: Exhaust Gas Recirculation (EGR) Valve out of range

er, right...ok :-?

1) What do these mean ?

2) How do I fix them ?

3) Would either of these cause the juddering issue ?

[unlucky alf]

got a similar thing with mine, when i get a chance im going to check the g/box rubber mount as ive noticed the selector lever tends to move around a little when mine does it, which i think tells me the box is not as tight on its mount as it should be, mine started doing it after my 2nd g/box change & i left the mount on it it came with.

[Seth]

Paper clip test gives:

64: Fuel Quantity Control out of range

96: Exhaust Gas Recirculation (EGR) Valve out of range

er, right...ok :-?

1) What do these mean ?

2) How do I fix them ?

3) Would either of these cause the juddering issue ?

1) The car's breaked!
2) You can't!
3) Possibly!

[Seth]

Paper clip test gives:

64: Fuel Quantity Control out of range

96: Exhaust Gas Recirculation (EGR) Valve out of range

er, right...ok :-?

1) What do these mean ?

2) How do I fix them ?

3) Would either of these cause the juddering issue ?

1) The car's breaked!
2) You can't!
3) Possibly!

I just couldn't resist the above!
Seriously, I've posted a reply on these issues in raywilb's post 'diagnostic test' currently on page 2.

I cured the EGR fault on mine by thoroughly cleaning out the entire induction system.
The '64' in my case eventually required a new injection pump - you don't want to know the cost ...... !
A 'PM' to Omegatoy might be helpful to you though ......

[Turk]

Injection pump is not too much of a problem. I have a complete 2.5td Elite that had no engine issues when last in regular use.

How much of a job is it to change ?

[3.2manual]

Sounds like an injection pump problem especially with that fuel quantity code stored, pretty common on the 2.5 td. The pump change is not too much of a job really.

[platty]

I have the same problem at 1500rpm, and I believe MickAP is the same - both post chipping.

I have put it down to the chip (without any good evidence), but it doesn't bother me too much, the only time I really notice it is btw 50 -55 mph in top so I just avoid that combo!

Judders like a bugger if it catches me out though!