Finding possible intake leak - VCDS Scan

[alw70]

Hi all,

 

I'm looking for some advice on tracing engine problems on a 2006 VRS TFSI. It wasn't boosting - so I tried the usual suspects of changing the DV (for a new rev G) and the PCV (for whatever the latest revision of that is). Anyway, it wasn't until I got it scanned that I found there was a code for the manifold pressure / boost pressure sensor which wouldn't clear. Upon investigation I found that the sensor had been left unplugged by whichever useless garage had last worked on it, so I plugged it in and there was boost!

 

However after driving for a bit and rescanning I have a new set of (presumably boost related) fault codes. The scan log for the engine is as follows:

 

Address 01: Engine        Labels: 06F-907-115-AXX.lbl

   Part No SW: 1Z0 907 115 A    HW: 1Z0 907 115 

   Component: 2.0l R4/4V TFSI     0040  

   Revision: --H10---    Serial number: SKZ7Z0E3380185

   Coding: 0203000318070060

   Shop #: WSC 28060 576 90107

   VCID: 3365F94E52956586591-8066

 

4 Faults Found:

004243 - Bank 1; Fuel Measuring System 2 

               P1093 - 008 - Malfunction - Intermittent

             Freeze Frame:

                    Fault Status: 00101000

                    Fault Priority: 0

                    Fault Frequency: 1

                    Reset counter: 255

                    Mileage: 134168 km

                    Time Indication: 0

                    Date: 2000.00.00

                    Time: 19:57:09

 

             Freeze Frame:

                    RPM: 1250 /min

                    Load: 13.7 %

                    Speed: 17.0 km/h

                    Temperature: 34.0°C

                    Temperature: 10.0°C

                    Absolute Pres.: 1020.0 mbar

                    Voltage: 14.478 V

 

001287 - Idle Control System RPM 

               P0507 - 001 - Higher than Expected.

             Freeze Frame:

                    Fault Status: 01100001

                    Fault Priority: 0

                    Fault Frequency: 3

                    Reset counter: 255

                    Mileage: 134176 km

                    Time Indication: 0

                    Date: 2000.00.00

                    Time: 20:08:10

 

             Freeze Frame:

                    RPM: 949 /min

                    Load: 14.9 %

                    Speed: 0.0 km/h

                    Temperature: 89.0°C

                    Temperature: 15.0°C

                    Absolute Pres.: 1020.0 mbar

                    Voltage: 14.478 V

 

008583 - Bank 1; System too Lean at Idle 

               P2187 - 004 - 

             Freeze Frame:

                    Fault Status: 01100100

                    Fault Priority: 0

                    Fault Frequency: 1

                    Reset counter: 255

                    Mileage: 134176 km

                    Time Indication: 0

                    Date: 2000.00.00

                    Time: 20:07:52

 

             Freeze Frame:

                    RPM: 1068 /min

                    Load: 14.5 %

                    Speed: 2.0 km/h

                    Temperature: 87.0°C

                    Temperature: 13.0°C

                    Absolute Pres.: 1020.0 mbar

                    Voltage: 14.605 V

 

008825 - Leak in Air Intake System 

               P2279 - 002 - 

             Freeze Frame:

                    Fault Status: 01100010

                    Fault Priority: 0

                    Fault Frequency: 1

                    Reset counter: 255

                    Mileage: 134186 km

                    Time Indication: 0

                    Date: 2000.00.00

                    Time: 20:27:26

 

             Freeze Frame:

                    RPM: 953 /min

                    Load: 15.3 %

                    Speed: 0.0 km/h

                    Temperature: 91.0°C

                    Temperature: 25.0°C

                    Absolute Pres.: 1020.0 mbar

                    Voltage: 14.478 V

 

 

There are no other relevant fault codes stored. Looking through the Rosstech wiki, it seems that the root cause of most, if not all, of the codes is the "Leak in Air Intake System". It would make sense that this could then cause the bank 1 system too lean at idle and thus the idle control system rpm too high. Although the fuel measuring system malfunction is a bit worrying.

 

Anyway - doe anyone have any ideas as to how to go about locating this leak in the air intake system, or is it an investigation job for a garage (it was only with them last week to change the thermostat!)?

 

Thanks,

Alexander

[IngusSeflers]

Try this method
https://www.youtube.com/watch?v=9CPqbaSgcok

[alw70]

So I've just had the engine cover off and investigated around the hoses with the engine running. It seems that as well as replacing my PCV, I should have also replaced the PCV plastic pipes as the long one seems to be leaking where it goes into the engine under the manifold (the idle goes crazy when I wiggle it). So a visit to TPS, and I'll replace both of the pipes and hopefully it'll be sorted (although getting the old one off at the bottom looks a bit tricky). If anyone knows the part numbers for the two plastic hoses that connect to the PCV that would be appreciated.

 

On a worrying note, I also noticed that my alternator housing is cracked - one of the four mounting brackets has sheared off. It's a fairly impressive thickness of metal to break, but the fatigue due to engine vibrations won't have helped. I'll have to try some epoxy weld as a temporary fix.

Edited 8 February, 2015 by alw70