My 1.6tdi Greenline is running really rough, and using a great deal of fuel, the diesel knock on acceleration is quite loud, and on a very light throttle load holding the car momentarily on the clutch the revs bounce from 500-1000rpm. 

 

I tried injection deviation quantity today on VCDS which didn't run properly, so I took the car for a short run and logged the inj deviation but the figures are confusing to me. 

 

Can anyone interpret please?

 

If it helps, mass air figures showed the ECU was expecting a given figure, but in reality was receiving 100kg/s more. 

Injdeviationquantity.xlsx

Probably not 100kg/s ... pesky autocorrect !

Sounds like it could well be an injector problem.???

Can you test out each injector?

I had the OEM ECU software re-flashed as it had been previously bodged to keep the EGR closed, and remove limp mode error messages. 

 

The idea is to get the car to OEM and then judge whether an injector is required or not.

 

So far, driving around town as usual the car is MUCH quieter, smoother, nicer to drive as I think the throttle response had been messed with,  and average MPG readout has gone up a fair bit. 

 

VCDS injector logs next ...