1997 Audi A6 V6 cranks, but won't start

Asked by Sep 08, 2015 at 06:57 PM about the 1997 Audi A6 2.8 quattro Sedan AWD

Question type: Maintenance & Repair

I have this audi (bought as of 2 years ago) that will not start. I've done a
good portion of my own homework, but any insights of an experienced
owner would be extremely helpful. According to the owner, it has stopped
in the middle of a drive, and it had to be towed home. They've had multiple
prospects shake their head, because they could not get it to start. The
following is the vag-com reading:

Chassis Type: 8D - Audi A4/S4/RS4 B5 (1995 > 2001)
Scan: 01 02 03 08 15 16 17 25 35 37 45 55 56 57 67 75 76 77

-------------------------------------------------------------------------------
Address 01: Engine Labels: 8D0-906-266.lbl
Part No: 8D0 906 266 B
Component: 2,8l V6/2V MPI OBD2 D02
Coding: 01242
Shop #: WSC 02324
VCID: 2B5BFDF0D9C9E266D8-513C

4 Faults Found:
17816 - EGR Temp Sensor (G98)
P1408 - 92-00 - Signal too Large
16785 - EGR System
P0401 - 93-00 - Insufficient Flow
17658 - Fuel Level too Low
P1250 - 68-00 -
16690 - Cylinder 6
P0306 - 64-00 - Misfire Detected
Readiness: N/A

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: None
Part No: 4A0 927 156 AL
VCID: 70E12A9C306FC1BEAD-4A52

1 Fault Found:
00526 - Brake Light Switch (F)
27-00 - Implausible Signal

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4D0-907-379-ABS.lbl
Part No: 4D0 907 379 L
Component: ABS/EDS BOSCH 5 4171
Shop #: BB 34171
VCID: 3773D18015815686AC-5120

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4A0-820-043.lbl
Part No: 4A0 820 043 K
Component: Klima-Vollautomat D05
Coding: 00162
Shop #: WSC 23247
VCID: 21471FD8AB05383672-2578

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8A0-959-655.lbl
Part No: 8A0 959 655 D
Component: Airbag V AUDI D01
Coding: 00127
Shop #: WSC 02324
VCID: 3469E68C04F7BD9E89-520C

1 Fault Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4Ax-919-03x-17.lbl
Part No: 4A1 919 035 CN
Component: C4-KOMBIINSTRUMENT D30
Coding: 00262
Shop #: WSC 00000
VCID: 72E520943E63F3AE5B-1DF4

No Faults Found
or DTCs not supported by controller
or a communication error occurred

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 8D0-862-257.lbl
Part No: 8LO 862 257 B
Component: CV-Pump,Alarm, RC
Coding: 12172
Shop #: WSC 65535
VCID: 53AB8510A1399AA6B0-4F02

8 Faults Found:
01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01372 - Alarm triggered by Door Contact Switch; Rear Passenger Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01369 - Alarm triggered by Hood Switch
35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
35-00 - -
01373 - Alarm triggered by Radio Ground Contact
35-00 - -

End-------------------------(Elapsed Time: 03:47)--------------------------

I understand the basics of spark + a/f = combustion.

Fuel:
-Pump sounds strong (recently replaced by previous owner)
-Fuel filter I can easily blow through, so I don't think it's clogged. It looks
new (recently replaced by previous owner)
-Fuel rail, clean, and no signs of clogging
-Cleaned all 6 fuel injectors.
***the odd thing is whenever I try to crank it, I get 0 pressure when I
attached the test gauge after the filter (it's the only place that the fuel
adapter kit will fit into), but after priming, I do see it coming out of the
injectors after I've reattached it to the fuel rail.

Air:
-New filter installed
-Cleaned MAF
-Cleaned airbox

Spark:
-New spark plug
-New ignition coils
-White spark all around
-Alternator removed, shop tested and verified to be working
-Starter removed, bench tested and also verified to be working
-New 2015 battery (last one was manufactured in 2005)

I still can't get it to crank. I would like some help. Thank you for reading this
far.

2 Answers

3,965

try to crank it by giving the starter external power. if still nothing check if the motor can be turned by hand.

13,345

Check the fuel pressure with a gauge at the fuel rail VAG scanner show nothing major expect bad grounds. which effect everything!

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