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Discussion Starter · #1 ·
Hi, I am just trying to get a confirmation on some issues I am having with my 2007 VW GTI (2.0T FSI).

Some background first:
Approx 158000+km
No performance upgrades (lame.. I know.. the only thing I've done is add a boost gauge)

-5 months ago I had regular service + I did the BG induction service. The dealer also replaced my PCV and RC motor under recall.
-2 months ago I had my cam follower/camshaft etc replaced under the extended warranty (I had been getting a CEL; at the time I didn't have VCDS or OBD2 reader).
-1 month after that I started getting misfires in cylinder 1 (at this point I picked up a OBDII reader, and also replaced my spark plugs and coil packs). Dealership diagnosed as failing injectors, so I had to shell out to replace all of the injectors, and I also replaced my fuel filter at the same time.
- 2 WEEKS after the injectors replaced I started getting another CEL. This time the OBDII reader tells me P0171 - too lean.
Symptoms: THis has been getting worse since the P0171 codes started, but iIntermittently, if I am in stop-go traffic, switching back and forth between first and second gear, I will be slowing to a complete stop, my foot has the clutch all the way in, and the engine will continue revving to 1600-1700 rpm for a a number of seconds. Even after I have come to a complete stop, the engine will still rev for a few seconds before going back down to 800 or so RPM. The CEL/MIL doesn't always immediately come on (at first it took a week to come back, now only a day or so).
Other than this "revv hang", I don't notice anything different in terms of performance, and something that is quite odd: my gas mileage has been phenomenal. I am getting almost 600 km out of 3/4 of the tank (I don't let it get much emptier then that as a rule)

Now, instead of going to the dealership and having those money vampires ding me again for nothing, I went out and got a Ross-tech Micro-CAN to attempt my own diagnose and repair.
 

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Discussion Starter · #2 ·
Here is my latest Auto log:

Saturday,20,October,2012,13:39:33:56742
VCDS Version: Release 11.11.4
Data version: 20120807



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 1K0
Scan: 01 03 08 09 15 16 17 19 1C 25 42 44 46 52 55 56

VIN: WVWEV71K67W011771 Mileage: 158340km/98387miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
1C-Position Sensing -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: Malfunction 0010
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Xenon Range -- Status: OK 0000
56-Radio -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine Labels: 06F-907-115-AXX.lbl
Part No SW: 1K0 907 115 H HW: 8P0 907 115 B
Component: 2.0l R4/4V TFSI 0040
Revision: 5BH14--- Serial number: VWZ7Z0F3906460
Coding: 0403010A18070160
Shop #: WSC 91505 999 67486
VCID: 2B7BD9F18AD89640A47

2 Faults Found:
008583 - Bank 1; System too Lean at Idle
P2187 - 004 - - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100100
Fault Priority: 2
Fault Frequency: 2
Mileage: 158178 km
Time Indication: 0
Date: 2000.00.00
Time: 07:39:16

Freeze Frame:
RPM: 758 /min
Load: 15.7 %
Speed: 0.0 km/h
Temperature: 60.0°C
Temperature: 16.0°C
Absolute Pres.: 870.0 mbar
Voltage: 14.478 V

001287 - Idle Control System RPM
P0507 - 001 - Higher than Expected. - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 2
Fault Frequency: 2
Mileage: 158259 km
Time Indication: 0
Date: 2000.00.00
Time: 17:57:23

Freeze Frame:
RPM: 1141 /min
Load: 14.5 %
Speed: 0.0 km/h
Temperature: 90.0°C
Temperature: 42.0°C
Absolute Pres.: 860.0 mbar
Voltage: 13.970 V

Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1K0-907-379-MK60-F.lbl
Part No SW: 1K0 907 379 AC HW: 1K0 907 379 AC
Component: ESP FRONT MK60 0101
Revision: 00H11001
Coding: 0021122
Shop #: WSC 01279 785 00200
VCID: 73CB019112688E802C7

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 1K0-820-047.lbl
Part No: 1K0 820 047 FJ
Component: Climatic PQ35 120 0606
Shop #: WSC 00000 000 00000
VCID: 71C70B996874BC90DEB

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 3C0-937-049-23-H.lbl
Part No SW: 3C0 937 049 Q HW: 3C0 937 049 Q
Component: Bordnetz-SG H46 1501
Revision: 00H46000 Serial number: 00000005709194
Coding: 178F8F214004150000140000001400000028770B5C0000
Shop #: WSC 91505 999 59364
VCID: 3753F581469022A0D0F

Subsystem 1 - Part No: 1K1 955 119 E Labels: 1KX-955-119.CLB
Component: Wischer 190506 020 0501
Coding: 00038805
Shop #: WSC 91505

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 1K0-909-605.lbl
Part No SW: 1K0 909 605 Q HW: 1K0 909 605 Q
Component: 5M AIRBAG VW8R 033 7900
Revision: 04033000 Serial number: 0038LD094RA9
Coding: 0013645
Shop #: WSC 01269 785 00200
VCID: 3A55ECB575823FC82F1

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 1K0-953-549-MY8.lbl
Part No SW: 1K0 953 549 AJ HW: 1K0 953 549 AJ
Component: J0527 034 0070
Coding: 0002022
Shop #: WSC 01279 785 00200
VCID: 7AD52CB53502FFC86F1

Part No: XXXXXXXXXXX
Component: E0221 002 0010

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 1K0-920-xxx-17.lbl
Part No SW: 1K6 920 873 A HW: 1K6 920 873 A
Component: KOMBIINSTRUMENT VDD 1610
Revision: V0003000 Serial number: VWZ7Z0F3906460
Coding: 0007303
Shop #: WSC 91511 999 12530
VCID: 3041CE9DA3FEF598915

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 1K0-907-530-V2.clb
Part No SW: 1K0 907 530 H HW: 1K0 907 951
Component: J533__Gateway H12 0150
Revision: H12 Serial number: 31001065170637
Coding: 7D0F03400F000000
Shop #: WSC 01279 785 00200
VCID: 2C79DAED8FD69178ADD

No fault code found.

-------------------------------------------------------------------------------
Address 1C: Position Sensing Labels: 1Kx-919-xxx-1C.lbl
Part No SW: 1K6 919 879 HW: 1K6 919 879
Component: Kompass 001 0002
Revision: 00001000 Serial number: 1225223T1DLV02
Shop #: WSC 00000 000 00000
VCID: FDDFA7A9A42C48F0CA3

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer Labels: 1K0-920-xxx-25.clb
Part No SW: 1K6 920 873 A HW: 1K6 920 873 A
Component: IMMO VDD 1610
Revision: V0003000 Serial number: VWZ7Z0F3906460
Shop #: WSC 00000 000 00000
VCID: 3041CE9DA3FEF598915

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 1K0-959-701-MIN3.lbl
Part No SW: 1K0 959 701 M HW: 1K0 959 701 M
Component: Tuer-SG 004 0953
Coding: 0001077
Shop #: WSC 01279 785 00200
VCID: 3851F6BD4B8E2DD8D95

1 Fault Found:
00109 - Left Mirror Turn Signal Lamp (L131)
012 - Electrical Fault in Circuit - Intermittent

-------------------------------------------------------------------------------
Address 44: Steering Assist Labels: 1Kx-909-14x-44.clb
Part No: 1K1 909 144 L
Component: EPS_ZFLS Kl.074 H07 1806
Shop #: WSC 00000 028 00001
VCID: 3449C28D57E6C9B8F5D

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 1K0-959-433-MAX.clb
Part No SW: 1K0 959 433 CA HW: 1K0 959 433 CA
Component: KSG PQ35 G2 020 0202
Revision: 00020000 Serial number: 00000000000000
Coding: 139006885103281B0904058FB0080A0488BC00
Shop #: WSC 00000 785 00200
VCID: 71C70B996874BC90DEB

Component: Sounder n.mounted

Component: NGS n.mounted

Component: IRUE n.mounted

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. Labels: 1K0-959-702-MIN3.lbl
Part No SW: 1K0 959 702 M HW: 1K0 959 702 M
Component: Tuer-SG 004 0953
Coding: 0001076
Shop #: WSC 01279 785 00200
VCID: 3957F3B9708434D026B

No fault code found.

-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 1T0-907-357.lbl
Part No: 1T0 907 357
Component: Dynamische LWR 0003
Coding: 0000003
Shop #: WSC 01279 785 00200
VCID: F4C9828D976609B8B5D

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 1K0-035-1xx-56.lbl
Part No SW: 1K0 035 180 H HW: 1K0 035 180 H
Component: Radio PM6 165 0018
Revision: 00165000 Serial number: VWZ5Z7F2078759
Coding: 0040401
Shop #: WSC 01279 785 00200
VCID: 256F2FC9EC3CA030723

No fault code found.
 

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Discussion Starter · #3 ·
I also followed the Ross-tech wiki for fuel trim http://www.ross-tech.com/vag-com/cars/fuel-trim.html

I logged Groups 002, 031, and 032 to do the MAF test. I did a full-throttle run in 2nd twice (WITH THE CEL/MIL ILLUMINATED.. ie I had not cleared the codes). The first time the intake air peaked at 163.97 g/s, the second time it went up to 162.89. I am WAY above sea level in Calgary, AB, so I figured that this is pretty much ballpark... so I ASSUME there is LIKELY nothing wrong with my MAF.

During the same runs, 31 showed:
TIME Current Value Specified Value
STAMP
0.27 1.01 1
0.75 0.98 1
1.21 0.99 1
1.68 0.97 1
2.12 1 1
2.61 1.04 1
3.07 1.01 0.95
3.55 1.05 1
3.97 1.02 1
4.47 0.97 1
4.94 1.02 1
5.43 0.98 1
5.85 1.02 1
6.33 0.95 1
6.8 0.96 1
7.28 0.93 0.93
7.71 0.92 0.92
8.17 0.93 0.92
8.65 0.9 0.91
9.12 0.89 0.91
9.56 0.74 0.74
10.04 0.71 0.73
10.54 0.72 0.73
11.01 1.99 0.95
11.45 1.99 0.95
11.92 1.99 0.95
12.4 1.99 0.95
12.88 1.99 0.95
13.3 1.99 0.95
13.77 1.99 0.95
14.26 1.99 0.95
14.72 1.99 0.95
96.72 1.01 1
97.19 0.98 1
97.67 0.95 1
98.14 0.97 0.97
98.56 0.95 0.96
99.04 0.95 0.95
99.51 0.92 0.94
99.99 0.75 0.76
100.45 0.73 0.73
100.93 0.73 0.74
101.41 0.72 0.73
101.91 0.7 0.74
102.35 1.99 0.95
102.83 1.99 0.95
103.34 1.99 0.95
103.82 1.99 0.95
104.24 1.99 0.95
104.71 1.99 0.95

During the same runs 32 showed:
Lambda (Idle) Lambda (Partial)
TIME Self-Adaptation Self-Adaptation
STAMP % %
0.47 5 -1.6
0.89 5 -1.6
1.36 5 -1.6
1.82 5 -1.6
2.32 5 -1.6
2.75 5 -1.6
3.21 5 -1.6
3.69 5 -1.6
4.18 5 -1.6
4.61 5 -1.6
5.08 5 -1.6
5.57 5 -1.6
6.05 5 -1.6
6.47 5 -1.6
6.94 5 -1.6
7.42 5 -1.6
7.89 5 -1.6
8.34 5 -1.6
8.8 5 -1.6
9.26 5 -1.6
9.76 5 -1.6
10.2 5 -1.6
10.68 5 -1.6
11.15 5 -1.6
11.63 5 -1.6
12.07 5 -1.6
12.54 5 -1.6
13.02 5 -1.6
13.5 5 -1.6
13.91 5 -1.6
14.4 5 -1.6
14.86 5 -1.6
96.44 5.3 -1.6
96.91 5.3 -1.6
97.33 5.3 -1.6
97.81 5.3 -1.6
98.28 5.3 -1.6
98.75 5.3 -1.6
99.18 5.3 -1.6
99.67 5.3 -1.6
100.15 5.3 -1.6
100.65 5.3 -1.6
101.07 5.3 -1.6
101.57 5.3 -1.6
102.07 5.3 -1.6
102.54 5.3 -1.6
102.99 5.3 -1.6
103.47 5.3 -1.6
103.96 5.3 -1.6
104.42 5.3 -1.6

Am I correct in assuming that it is most likely a vacuum leak somewhere (post-MAF?), or could there be an issue with the new injectors? Or a sticking throttle body? I have a hard time believing that it is a coincidence that this started 2 weeks after getting injectors replaced... but it may not be directly related.. maybe they didn't tighten something afterwards?
There are no obvious loose/disconnected hoses, and I'm afraid looking for leaks is a bit beyond my skillz. I've heard too many conflicting methods as well (spray throttle body cleaner, propane, pressurize with a bike pump contraption and use soapy water etc etc..)

Are there any other logs I could run to help diagnose? What Groups, etc should I log, and for how long of a run?

Sorry for the huge post, but I wanted to try to be thorough.

Thanks for any and all help!
 

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Discussion Starter · #5 ·
Perhaps a secondary question: How many hoses are there after the MAF that could leak? Does anyone have a schematic of the engine on the turbo inlet side?

I have a theory that there may be a hole or something in the pipe that goes from the stock cover to the turbo, but I want to get more info about the other possibly leaking hoses before I go rip it off for nothing.
 

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There isn't a house after the inlet that could leak without throwing a boost leak, that would make it run rich, but the ecu would work itself to the point and adjust itself. Get sine carb cleaner, spray the maf, and blow it with air, and make sure the air box us seated right. . Do u have a vag vom? Run a log and email it to me: [email protected]
 

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Discussion Starter · #7 ·
Ahh, so if there isn't a hose after the turbo that would leak (without a boost leak), then it COULD be the pipe between the MAF and the turbo inlet..?

Last time I looked in my engine bay it did sort of look like the engine cover was a bit off. The only reason I say that is that the oil cap didn't seem to be flush with the top, it seemed like it was slanting to the left (ie. the left side of the cover was up more than it should be). I removed the cover, grommets etc.. put it back on, and it seemed to be sitting properly after that.. No change to the lean codes though.

I have VCDS, what logs/groups/blocks would be helpful? How should I run them? (ie. full throttle run in 2nd gear, or something else?)

Thanks for your help!
 

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Perhaps a secondary question: How many hoses are there after the MAF that could leak? Does anyone have a schematic of the engine on the turbo inlet side?

I have a theory that there may be a hole or something in the pipe that goes from the stock cover to the turbo, but I want to get more info about the other possibly leaking hoses before I go rip it off for nothing.
Check this out:

http://www.golfmkv.com/forums/golfgoodies/mk5golfengine.pdf
 

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Discussion Starter · #9 ·
Well, I have had one local VW tuner shop diagnose my problem as being a failed/failing PCV.

My stealership replaced my PCV 6 months ago (just part of the TSB.. my original had not failed), so now I'll be off to them to see if they will replace it for free...
 

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Was there ever a resolution to this ssue? My 2012 is doing the exact same thing.
 

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Discussion Starter · #11 ·
Yes, I forgot to post the solution. My local tuner shop had incorrectly diagnosed a failing PCV.
I took my car to the stealership to see if they would replace the PCV, but low and behold there was nothing wrong with it.
The ACTUAL problem was that a crack had formed in the tube where the tuner shop had installed my boost gauge back in 2007!
Stealership replaced the tube and did a clean install of the boost gauge and I've been problem free ever since.

Hope that helps!
 

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Thanks for the response. I have been smoke tested and still no leaks............................... the issue comes and goes. Almost like a 2 cycle engine with bad gas in the tank.
 
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