Petrol 56 Octavia vrs RPM raising and dropping whilst idle/stationary

[PeteHuws]

Morning experts.  My 2006 Petrol Octavia developed a bizarre issue last weekend wherein I noticed when stopped at some lights in neutral  the cars rpm started to rise sometimes to 1500 then would fall back to abot 800, then raise again and drop, shortly after ata another stop I noticed the rpm go above 2000 before then falling back.  Its always had a lumpy ide but has always sat solidly at 800, anybody come across this before?  Many thanks gang!!

[brown_d9]

Hi there,

 

Sounds like it could be the PCV valve, similar symptoms to mind ( all be it a different engine)

 

Pull the dipstick out whilst its running and see if there is a massive suck of air going through the dipstick hole, if there is then its probably the PCV.

 

Dan

[PeteHuws]

Great, I'll give it a try, cheers Dan....

[PeteHuws]

Just been out to VCDS scan it, strange the engine management light is now on this morning.

 

Address 01: Engine        Labels: 06F-907-115-AXX.lbl
   Part No SW: 1Z0 907 115 A    HW: 8P0 907 115 B
   Component: 2.0l R4/4V TFSI     0040  
   Revision: 5BH16---    Serial number: SKZ7Z0F3533346
   Coding: 0203000318070160
   Shop #: WSC 00191 264 15243
   VCID: 336373A152584AA69B-8066

6 Faults Found:
001287 - Idle Control System RPM
               P0507 - 001 - Higher than Expected.
             Freeze Frame:
                    Fault Status: 01100001
                    Fault Priority: 0
                    Fault Frequency: 11
                    Reset counter: 255
                    Mileage: 188329 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 09:43:07

             Freeze Frame:
                    RPM: 1146 /min
                    Load: 13.3 %
                    Speed: 0.0 km/h
                    Temperature: 81.0°C
                    Temperature: 27.0°C
                    Absolute Pres.: 1010.0 mbar
                    Voltage: 14.478 V

008583 - Bank 1; System too Lean at Idle
               P2187 - 004 -  - MIL ON
             Freeze Frame:
                    Fault Status: 11100100
                    Fault Priority: 0
                    Fault Frequency: 3
                    Reset counter: 255
                    Mileage: 188355 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 10:39:26

             Freeze Frame:
                    RPM: 941 /min
                    Load: 14.9 %
                    Speed: 0.0 km/h
                    Temperature: 82.0°C
                    Temperature: 33.0°C
                    Absolute Pres.: 1020.0 mbar
                    Voltage: 14.224 V

008825 - Leak in Air Intake System
               P2279 - 002 -
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 2
                    Reset counter: 255
                    Mileage: 188459 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 11:45:14

             Freeze Frame:
                    RPM: 885 /min
                    Load: 14.9 %
                    Speed: 0.0 km/h
                    Temperature: 83.0°C
                    Temperature: 43.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.097 V

004243 - Bank 1; Fuel Measuring System 2
               P1093 - 008 - Malfunction - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 0
                    Fault Frequency: 3
                    Reset counter: 255
                    Mileage: 188602 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 11:04:46

             Freeze Frame:
                    RPM: 1395 /min
                    Load: 16.5 %
                    Speed: 27.0 km/h
                    Temperature: 78.0°C
                    Temperature: 43.0°C
                    Absolute Pres.: 1010.0 mbar
                    Voltage: 14.097 V

012599 - Intake Manifold Runner Control
               P3137 - 001 - Basic Setting not Completed - Intermittent
             Freeze Frame:
                    Fault Status: 00100001
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 189598 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 0 /min
                    Load: 0.0 %
                    Speed: 0.0 km/h
                    Temperature: 54.0°C
                    Temperature: 50.0°C
                    Absolute Pres.: 1010.0 mbar
                    Voltage: 12.319 V

001602 - Sensor Reference Voltage A: Circuit
               P0642 - 002 - Low - Intermittent - MIL ON
             Freeze Frame:
                    Fault Status: 10100010
                    Fault Priority: 0
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 189598 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 0 /min
                    Load: 0.0 %
                    Speed: 0.0 km/h
                    Temperature: 54.0°C
                    Temperature: 50.0°C
                    Absolute Pres.: 1010.0 mbar
                    Voltage: 12.319 V

Readiness: 0000 0000
 

[PerformanceDiesel]

I would say pcv needs a change

[Nobafett]

These are exactly the symptoms I had which stopped me going on track at Castle Combe. Turned out to be a faulty MAF, caused by a disintegrated filter. My own stupid fault for not checking it enough.

[brown_d9]

Did you get to the bottom of the issue in the end?

 

Dan