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V10 Poor/Rough Idle

8580 Views 9 Replies 5 Participants Last post by  GTekW8
Greetings all, my 2006 Touareg V10 has developed a few new problems in the past few months, any in-site or previous experience would be appreciated.

1. Idle issue:
For about 2 weeks the engine has been having trouble maintaining a smooth idle, before this its always been really good and it seems to do worse after the engine warms up. It never has any trouble starting and acceleration seems normal as well. Normal idle appears to be around 600RPM and now its constantly diving to 500 and then catching itself and bringing it back up to 600. When it catches itself it causes the whole vehicle to shake, you can hear it and feel it. I have posted a YouTube video to help explain.

2. Odd vibration/studder at low RPM cruising:
This issue has been going on longer than the idle issue but may be related (which is the only reason I bring it up). When driving around town around 35MPH (5th gear) or 45MPH (6th gear) I sometimes notice a kind of stuttering feeling in which I thought was coming from the drive train or tires but now it feels more like a miss (if this were a gas engine) and is happening more frequently. It only happens if I have previously accelerated hard and then let up once I got to speed and only if that speed results in a very low engine RPM (1100-1200). If I manually change down a gear, the feeling always goes back to normal. There is never any hesitation when I go to accelerate though, the power is always there.

3. Oil smell and smoke during regen:
For about the last 3 or so regens I have noticed the smell of burning oil, this is new and previously I would only notice that a regen had happened due to the white smoke out the exhaust or if I got out I could sometimes tell that something smelled hot, but I had not smelled hot oil until recently. On the last regen I could see smoke coming out of the area around the passenger side headlight.
I have done a lot of reading about this and my assumption is that the gasket around the tandem pump on that side is failing. But I appreciate any thoughts on the matter.

4. Exhaust leak (I've already posted about this before)
I have an exhaust leak most likely coming from the exhaust manifold(s) or an EGR tube. This issue has existed since purchasing the vehicle about a year ago but I bring it up in-case it relates to the other issue. It is not a very bad leak (smell wise) but it was hard to justify dropping the engine unless another issue arouse and also needed fixing (which may now be the case).

I plan on getting a diagnostic at the dealer, and I trust the Master Diesel Mechanic there, he has done some good work on the Touareg already. But I value any input you may have so very much. I know it seems crazy to spend so much on some of these repairs, but my wife and I really like the V10 and if possible would like to keep it in good repair and hang onto it for as long as we can. Thanks again for your time in reading all of this, I'll post any updates that I get on my end. Also, I have posted below the results of a VCDS scan I just ran today (I deleted all the sections with no faults to keep this post from being even longer).

VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: (x64)
Data version: 20171130 DS276.6
Ross-Tech: Home

Chassis Type: 7L (7L - VW Touareg (2003 > 11/2006))
Scan: 01 02 03 05 06 08 09 11 13 15 16 17 18 19 1C 22 29 32 34 36
37 39 3C 46 47 55 56 57 64 65 68 69 6C 6D 6E 75 76 77

VIN: WVGPT77L56D063607 Mileage: 174700km-108553miles
Address 05: Acc/Start Auth. Labels: None
Part No SW: 7L0 909 137 A HW: 5WK 485 02
Component: 29 Kessy 6700
Revision: 67005915 Serial number: VWZ3Z0F6459583
Coding: 0147688
Shop #: WSC 31414 000 00000
VCID: 31689A3FABD254CE2E-5140

Subsystem 1 - Part No: XXXXXXXXXXX
Component: ELV XXXX

3 Faults Found:
00191 - Passenger's Door Handle Touch Sensor (G416)
007 - Short to Ground
00955 - Key 1
002 - Lower Limit Exceeded
00180 - Access/Start Authorization Antenna; Passenger Side (R135)
001 - Upper Limit Exceeded

Address 08: Auto HVAC Labels: None
Part No: 7L6 907 044 T
Component: CLIMAtronic 2+2 4222
Coding: 0020030
Shop #: WSC 50423 001 1048576
VCID: 4580DEEF0F5AE86EE2-515E

Subsystem 1 - Part No: 7L6 907 049 E
Component: CLIMAtronic FOND 0400

4 Faults Found:
02379 - Positioning Motor for Left Side Vent (V299)
005 - No or Incorrect Basic Setting / Adaptation
02380 - Positioning Motor for Right Side Vent (V300)
000 - -
00714 - Centre Right Vent Positioning Motor (V111)
005 - No or Incorrect Basic Setting / Adaptation
00710 - Defroster Flap Positioning Motor (V107)
000 - -

Address 09: Cent. Elect. Labels:. 7Lx-937-049-V1.clb
Part No: 7L6 937 049 N
Component: 3002
Coding: 0111839
Shop #: WSC 31414 000 00000
VCID: 479CD4E73556FA7E10-5140

1 Fault Found:
00907 - Intervention load Management
000 - -

Address 11: Engine II Labels: Redir Fail!
Part No SW: 070 906 016 CQ HW: 028 101 196 2
Component: V10 5,0L EDCG001AGSª9805
Revision: --H02--- Serial number: VWZ3Z0F6459583
Coding: 0060575
Shop #: WSC 50423 001 1048576

2 Faults Found:
012374 - Exhaust Pressure Sensor 2 (G451)
P3056 - 000 - Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 174449 km
Time Indication: 0

Freeze Frame:
RPM: 630 /min
Speed: 0.0 km/h
(no units): -22.95
Raw, Form. N/A: 000 000 128
Temperature: 6.0°C
Temperature: -11.7°C

012298 - Diesel Particle Filter; Differential Pressure Sensor; Bank 2
P300A - 000 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 174453 km
Time Indication: 0

Freeze Frame:
RPM: 0 /min
Speed: 0.0 km/h
(no units): 0.00
Raw, Form. N/A: 000 000 128
Temperature: 414.0°C
Temperature: -10.8°C

Address 15: Airbags Labels: 3D0-909-601.lbl
Part No: 3D0 909 601 H
Component: 05 Airbag 8.4E++H01 0562
Revision: BB38727 Serial number: 0007814:
Coding: 0012341
Shop #: WSC 31414 000 00000
VCID: 285E775B98081506F9-515E

Subsystem 1 - Part No: 7L0 959 339 C
Component: BF-Gewichtsens. 006 0008

1 Fault Found:
01316 - ABS Control Module
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 2
Fault Frequency: 2
Reset counter: 255
Time Indication: 0

Address 18: Aux. Heat Labels: 7L6-819-008.lbl
Part No: 7L6 815 071 D
Component: Standheizung E1MAC
Coding: 0000100
Shop #: WSC 31414 000 00000
VCID: 3364903751CE66DE5C-515E

1 Fault Found:
01126 - Engine Speed Signal
008 - Implausible Signal - Intermittent

End-------------------------(Elapsed Time: 08:06)--------------------------
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I’ve had rough idle too at times, restart most times fixes it.
How can the fuel pumps be tested Drag?
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