Wondering if Injectors are part of poor running problem. (see other posts for details)

 

My understanding is that  Injection Quantity Deviation should be as close to zero as possible for all but that if one of the cylinders deviates significantly then other cylinders will compensate so that even if there is significant deviation the sum of the four will be very close to zero.

 

What I am not clear about is what is the maximum deviations that could be considered good and what would be an upper limit? I am finding some contradicting info regarding this.

 

I do note that if I sum the four here it comes to -0.02 mg/str (so close to zero)

 

 

 -0.96 mg/str  Injection Quantity Deviation Cyl. 1

  -0.28 mg/str  Injection Quantity Deviation Cyl. 2

  0.78 mg/str  Injection Quantity Deviation Cyl. 3

  0.45 mg/str  Injection Quantity Deviation Cyl. 4

 

So do you think these figures point to Injector problems?

 

Thanks

_________________________________________________________________________________________________________

 

Octavia 2                1.9PD              BXE

 

Sunday,10,April,2016,16:58:01:22827

VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8.1 x64

VCDS Version: 15.7.4.1 (x64)

Data version: 20160216

www.Ross-Tech.com

 

 

Mileage: 141550km-87955mi   Repair Order: 2

 

 

                Address 01: Engine  

 

16:57:51 Group 011: Charge Pressure Control

  819 /min  Engine Speed (G28)

  1091.4 mbar  Boost Pressure (specified)

  867.0 mbar  Boost Pressure (actual)

  84.0 %  Charge Pressure Control Duty Cycle

 

16:57:51 Group 013: Idle Stabilization (Injection Quantity Deviation)

  -0.96 mg/str  Injection Quantity Deviation Cyl. 1

  -0.28 mg/str  Injection Quantity Deviation Cyl. 2

  0.78 mg/str  Injection Quantity Deviation Cyl. 3

  0.45 mg/str  Injection Quantity Deviation Cyl. 4

 

16:57:51 Group 004: Pump-Jet Valves

  819 /min  Engine Speed (G28)

  0.0 °BTDC  Injection Start (specified)

  7.7°KW  Injection Duration (specified)

  0.5°KW  Torsion Value 

 

Those are all well within the tolerance of +/-2.99mg/str and nothing out of the ordinary from those I've seen in the past.