RPM fluctations when car is idle

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11-28-2014, 10:47 AM

mgaspersic

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RPM fluctations when car is idle

Hi guys,

I have been searching for a while on this forum for any usefull informations about my problem, but I can't find anything. I hope someone could help me. I have big problems with RPM fluctations when car is idle. While car is driving everything seems to work fine, fluctations only occur when car is idle.

Here is video of my problem:

If I add more power to engine, it's running ok and also there are no fluctations when I drive car OR even there are no noticable fluctations when car have more than 1200 RPM. Also none of any strange sounds can be heard from engine. When car is idle, rpm fluctates from 700-1000 rpm also even more if I turn on A/C like 600-1000. Fluctations have similar feeling like car would run out of gas, but it don't stops. I'm sure, there is/was enough gas inside. When problem occured, car had almost half of a tank.

Car has also been tested with VAG-PC software and report was:

Code:

 Address 01: Engine       Labels: 03L-906-019-CAG.clb
Control Module Part Number: 03L 906 019 AL    HW: 03L 906 019 AL
  Component and/or Version: R4 2,0L EDC   H34 9097
           Software Coding: 0A194012232403080000
            Work Shop Code: WSC 06324 000 00000
              ASAM Dataset: EV_ECM20TDI03L906019AL A02008 (AU48)
                      VCID: 75E5E5E76701
4 Faults Found:

4698 - Function Restriction due to Received Malfunction Value 
          U1113 00 [032] - Open or Short to Plus
4699 - Function Restriction due to Received Malfunction Value 
          U1113 00 [032] - Open Circuit
5175 - Fuel Pressure Regulation: Regulation Discrepancy 
          P1065 00 [109] - Short to Ground
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 160206 km
                    Date: 2014.11.26
                    Time: 17:17:55

4278 - Implausible Data Received from ABS Control Module 
          U0415 00 [032] - Short to Plus

Readiness: 0 0 0 0 0

Probably only third message is related to this problem (Fuel Pressure Regulation). There is also a date and time described and matches the time when I notice error.

I am not sure what's going on and error message which vag displayed to me is to much general to me to locate the problem.

What could cause rpm fluctations in my case? Is it safe to drive with fluctations? is it possible to damage engine? I know, that there could be number of parts which could fail, but I don't know where to start. I don't want to drive car to audi servis yet.

Car is Audi A4 B8 88kw 120hp, engine type is CAGC, 160.000 km.

Mgaspersic