Fuel correction figures D5

[italian job]

Can you give me your views on these please?
Just a little info,2005 163Bhp 150000 miles currently using more fuel than normal,down on power a little,the odd puff of black smoke evident when towing/working hard,something definitely amiss at the moment.
1. 7.01mm3
2. 5.56mm3
3. 6.07mm3
4. 0
5. 33.73mm3

I haven't done a leak back check yet,that's tomorrows job.
When you do the correction check on Vida it says that 0 is the preferred value,anything above plus or minus 3mm3 indicates problems,so according to that 4 out of 5 of my injectors! Including no1 which was an expensive replacement from volvo within the last 2 years.
Cheers Paul

[5cilinder]

Do the leakback test , they will confirm those high correction figures
No problems with starting?

[outnumbered]

Hi Paul,
this is the screen shot of the 163 when i had it

[Element888]

Fuel correction readings through VIDA on EURO 3 and EURO 4 engines will be complete different. When I checked my friends readings on EURO 3 - they were same as yours - No. 4 - 0 no 5 - 5x more than usual. Still driving with no issues and pulls like a train. I have no explanation for this. But your case might be different.

[italian job]

Thanks all for replying and for the comparison results...yes mine has always been more difficult to start when hot,you have to catch it on the accelerator,i still haven't got to the bottom of that.
I'll update when i have done the leak back.

Cheers Paul.

[brickman]

Not sure if its just an anomoly in VIDA/VOLFCR but my older D5252t (pre-D5 cast iron VAG lump) is not common rail and yet has correction values appearing in the field, not dissimilar to yours. But there is no way of changing it (electronically or mechanically as the pump cannot be adjusted in such a way).

[italian job]

Just to update,did the leak back test,no1 injector was the worse,thats the one I bought from Volvo,has always suffered from injector "clacking" sinse fitment.Swapped for used replacement now much quieter. Swapped no5 just to see if it would have any effect on correction figures.....not a bit,so not sure what that's all about.

Paul.

[Dancake]

I know this is an old thread, but I done the VIDA injector test today and here are the results

Combustion test
Cylinder 1 - 706rpm
Cylinder 2 - 700rpm
Cylinder 3 - 702rpm
Cylinder 4 - 688rpm
Cylinder 5 - 700rpm

Compression test
Cylinder 1 - 195rpm
Cylinder 2 - 196rpm
Cylinder 3 - 194rpm
Cylinder 4 - 182rpm
Cylinder 5 - 195rpm

When doing the fuel correction test, a reading outside the permissable parameters (3.00mm3 or -3.00mm3 per injector) indicates a problem with that injector. The ideal reading should be 0.00mm3, which contradicts my theory that injector 4 is faulty. According to these test results, 4 out of 5 injectors are faulty

Fuel correction test
Cylinder 1 - 7.00 mm3
Cylinder 2 - 6.58 mm3
Cylinder 3 - 6.03 mm3
Cylinder 4 - 0.00 mm3
Cylinder 5 - 34.82 mm3

I also done a leak back test. Injector number 4 was leaking back more fuel than the others, though injector 5 wasn't too far behind. Going to try a diesel purge before taking the readings again. Should be interesting. At the minute though it's looking like injector 4 is the culprit. Tomorrows live data tests should hopefully confirm my suspicions beyond doubt. I am hoping the lower compression and combustion figures of cylinder 4 are as a result of a faulty injector and not a valve.

[GrahamBrown1]

They are all out of spec by a long way baring number 4. If number 4 is leaking back to much then I would say your looking at a full set replacement here. You also need to check the electrical connections and wiring for corrosion or damage.

[Fearone]

Originally Posted by Dancake

I know this is an old thread, but I done the VIDA injector test today and here are the results

Combustion test
Cylinder 1 - 706rpm
Cylinder 2 - 700rpm
Cylinder 3 - 702rpm
Cylinder 4 - 688rpm
Cylinder 5 - 700rpm

Compression test
Cylinder 1 - 195rpm
Cylinder 2 - 196rpm
Cylinder 3 - 194rpm
Cylinder 4 - 182rpm
Cylinder 5 - 195rpm

When doing the fuel correction test, a reading outside the permissable parameters (3.00mm3 or -3.00mm3 per injector) indicates a problem with that injector. The ideal reading should be 0.00mm3, which contradicts my theory that injector 4 is faulty. According to these test results, 4 out of 5 injectors are faulty

Fuel correction test
Cylinder 1 - 7.00 mm3
Cylinder 2 - 6.58 mm3
Cylinder 3 - 6.03 mm3
Cylinder 4 - 0.00 mm3
Cylinder 5 - 34.82 mm3

I also done a leak back test. Injector number 4 was leaking back more fuel than the others, though injector 5 wasn't too far behind. Going to try a diesel purge before taking the readings again. Should be interesting. At the minute though it's looking like injector 4 is the culprit. Tomorrows live data tests should hopefully confirm my suspicions beyond doubt. I am hoping the lower compression and combustion figures of cylinder 4 are as a result of a faulty injector and not a valve.

Looking forward to post lm diesel purge results