i recently reaquainted myself with vag-com. i have a problem that only happens at random times. at idle the revs jump from 500 to 1200 rpms, when i acelerate and rpms are under 3000 the cars has a shudder. all of the problems only seem to last for at most 5-7 minutes and then it's normal. i have not had a single check engine light. i am looking for some areas to monitor to pinpoint the problem. i have had luck in shutting the car off and right back on to fix the problem. seems to me something electical/sensor related but running out of ideas. replaced one cam sensor and more to try, all the plugs and coil packs. it is an 04 a4 3.0 with 50k on it.

thanks
andrew

 

Lets start with some basics and post an Auto-Scan from the vehicle in question please.

 

here you go, sorry. still no cel. the one suspect is while looking at groups 35 and 34 under the engine section the dynamic factor for both sensors are out of spec. bank one around 1.75 and bank 2 1.55. not sure what this means but it may help.

VCDS Version: Release 805.3
Data version: 20090213

Sunday,19,April,2009,15:55:44:54196

Chassis Type: 8E - Audi A4 B6/B7
Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
69 75 76 77

VIN: WAUVT58E14A200392 Mileage: 81740km/50790miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 06C-909-559-ASN.lbl
Part No SW: 8E0 909 559 L HW: 8E0 909 059
Component: 3.0L V6/5V G 0020
Coding: 0016751
Shop #: WSC 63251 000 00000

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 8E0 927 156 Q
Component: AG5 01V 3.0l5V USA 1214
Coding: 0001002
Shop #: WSC 63251 000 00000

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-517.lbl
Part No: 8E0 614 517 A
Component: ABS/ESP allrad 3429
Coding: 04497
Shop #: WSC 06435

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Part No: 8E0 820 043 AD
Component: A4 Klimaautomat 1323
Coding: 00000
Shop #: WSC 63251

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 8E0-907-279-8E2.lbl
Part No: 8E0 907 279 F
Component: int. Lastmodul USA 0517
Coding: 01013
Shop #: WSC 63251

1 Fault Found:
02104 - Light Detection Sensor (G399)
29-10 - Short to Ground - Intermittent

-------------------------------------------------------------------------------
Address 0F: Digital Radio Labels: 8E0-035-593-XM.lbl
Part No: 8E0 035 593 A
Component: SDAR XM 0010

1 Fault Found:
02635 - Tuner Not Enabled/Activated
35-00 - -

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-959-655-84.lbl
Part No: 8E0 959 655 K
Component: Airbag 8.4EP 1001
Coding: 0010707
Shop #: WSC 63251 000 00000

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8E0-953-549.lbl
Part No: 8E0 953 549 N
Component: Lenksáulenmodul 0611
Coding: 02042
Shop #: WSC 63251

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 981 E
Component: KOMBI+WEGFAHRS. RB4 D42
Coding: 01231
Shop #: WSC 06108
WAUVT58E14A200392 AUZ6Z0C0316488

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: 8E0-959-760.lbl
Part No: 8E0 959 760
Component: Sitzmemory R2 F 0305
Coding: 00002
Shop #: WSC 63251

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation Labels: Redir Fail!
Part No: 4B0 919 887 E
Component: BNS 4.2 H05 BNO 0050

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
Part No: 8E0 959 433 BB
Component: Komfortgerát T7B 1512
Coding: 12140
Shop #: WSC 63251

Part No: 8E1959801
Component: Tõrsteuer.FS BRM 0004

Part No: 8E1959802E
Component: Tõrsteuer.BF BRM 0004

Part No: 8E0959801A
Component: Tõrsteuer.HL BRM 0004

Part No: 8E0959802A
Component: Tõrsteuer.HR BRM 0004

No fault code found.

-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 4Z7-907-357.lbl
Part No: 4Z7 907 357
Component: dynamische LWR D09
Coding: 00060
Shop #: WSC 63251

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 8E0 035 195 H
Component: symphony II NP2 0410
Coding: 01215
Shop #: WSC 01792

No fault code found.

End ---------------------------------------------------------------------