2.8L 1998 A4 Quattro wont start.. anyone got any suggestions ?
 

Hi All,

I have a 1998 Audi A4 Quattro saloon with the 2.8L engine. It ran pretty well until recently, then it had trouble starting for a day or two, then finally wouldn't start at all.

I searched various forums and all seemed to suggest the fuel pump relay as the prime suspect. I dug out the manual and replaced the fuel pump relay. At least I think it was the fuel pump relay, I couldn't find a diagram showing the exact configuration of relays in my car. The relay I replaced was part number 4DO 951 253 $ 89 9309 000.

Still no luck, I disconnected the return from the fuel rail and ran the pump and it seems to be delivering fuel just fine. I tested the resistance of coils and ht leads and all were within spec. I pulled various fuses as suggested by the manual and everything tested out fine... but the darn thing still wont start.. ! :confused:

So today I used vag com software and got the following results..

VAG-COM
Windows Based VAG/VAS Emulator
Version: Release 409.1-US
www.Ross-Tech.com
Dealer/Shop Name:
Workshop Code: 000 00000
Self-Diagnosis Log
Thursday, 18 February 2010, 15:43:54
VIN Number: WAUZZZ8DZWA157064 License Plate:
Mileage: 82265 km Repair Order:
Chassis Type: 8D - Audi A4 B5
Scan: 01,02,03,08,15,17,25,35,45,55,56
-------------------------------------------------------------------------------
Address 01: Engine
Controller: 4D0 907 551 G
Component: 2.8L V6/5V MOTR AT D01
Coding: 04251
Shop #: WSC 06325
10 Faults Found:
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
01249 - Fuel Injector for Cylinder 1 (N30)
26-10 - Output Open - Intermittent
01250 - Fuel Injector for Cylinder 2 (N31)
26-10 - Output Open - Intermittent
01251 - Fuel Injector for Cylinder 3 (N32)
26-10 - Output Open - Intermittent
01252 - Fuel Injector for Cylinder 4 (N33)
26-10 - Output Open - Intermittent
01253 - Fuel Injector for Cylinder 5 (N83)
26-10 - Output Open - Intermittent
01254 - Fuel Injector for Cylinder 6 (N84)
26-10 - Output Open - Intermittent
01247 - Activated Charcoal Filter (EVAP) System Solenoid Valve 1 (N80)
29-10 - Short to Ground - Intermittent
17923 - Intake Manifold Valve (N156): Short to Ground
P1515 - 35-10 - - - Intermittent
01259 - Fuel Pump Relay (J17)
31-10 - Open or Short to Ground - Intermittent
Readiness: N/A
-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 8D0 927 156 BE
Component: AG5 01V 2.8l5V RdW 7803
Coding: 00000
Shop #: WSC 00000
1 Fault Found:
00526 - Brake Light Switch-F
27-00 - Implausible Signal
-------------------------------------------------------------------------------
Address 08: Auto HVAC
Controller: 8L0 820
Note: Excessive Comm Errors
-------------------------------------------------------------------------------
Address 25: Immobilizer
Controller: Bit teA dre ss
Component: e 17 eingeben
No Faults Found
or DTCs not supported by controller
or a communication error ocurred
-------------------------------------------------------------------------------
Address 35: Centr. Locks
Controller: 8L0 862 257 M
Component: CV-Pump, Alarm, RC D05
Coding: 12800
Shop #: WSC 06325
4 Faults Found:
01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
35-00 - -
01366 - Opened Due to Crash Signal
35-00 - -
00955 - Key 1
09-00 - Adaptation Limit Surpassed
00956 - Key 2
09-00 - Adaptation Limit Surpassed
End --------------------------------------------------------------------------------------------------

I'm pretty sure the central locking errors all refer to a previous problem with a disintegrated impeller in the central locking pump.

I would be really grateful for any advice as to how to procede from here ?

Thanks in advance..

reset all the codes than come back with the codes to is also have you checked the fuse?

Hi Andrew, thank you for the advice, I reset all the codes, and realigned the throttle body. The car still wont start, and there are no new codes being generated.

The car cranks well, and sounds on the brink of firing, but never does. If I crank it for a long time, I get three beeps and the oil light comes on...

I checked the fuses for the fuel pump and they seem fine, are there any others I should check.

Thanks and best regards,

Gavan

okay so do you if the car is getting gas and a spark from the plugs? maby you need new coil packs

The injector codes are cluing me... I'm thinking you have a bad cam or crank sensor. i would say theft problem but you say it had trouble then finaly died so theft is ruled out, to a degree. now are you able to watch the data with the computer you have. if so check for rpm while cranking. no rpm then more then likely a crank sensor, but still could be a cam sensor. further more i'd be checking for good spark and diod the injector harnesses... see what ya come up with and get back to use.

maybe
 

well im having a problem something like yours but mine still runs just dies when i drive the car long amounts of time or run the ac and idle for a while. i pulled the relay i thought was the fuel pump and come to find out it poped up 8 codes the same codes you are having so i would say your problem is probaly that relay it runs the injectors the egr and the fuel tank presure vavle

Can you explain the 'trouble starting' a little more? I know it's a 'weird' question, but can you explain it better?

Okay, I know this is going to sound weird, and people will disagree with me, but, as long as you have yoru radio code, disconnect the battery, both positive and negative for OVER 24 hours, just let it sit. Then reconnect them, and THEN read the codes....

If it was a cam sensor failure it'd log the code and run anyway - it only needs to be cued by one of the two cam sensors to run (had this failure). The crank sensor could cause it although it should trip a fail code. The two likely suspects to me are the ignition switch or the fuel pump. If the pump dies you won't get much in the way of codes but it could be the issue. It seems like the ignition switch could be it simply because of how many things aren't running or firing up, and all depend on the ignition voltage in order to run.

Search out a recent thread of mine called "weird sh*t while troubleshooting my car today" and you can try some of the things I did and see if they help you narrow it down.

Btw, the fuel pump relay should be stamped with the number 372 on it.

I have 1997 2.8 5 speed... had many checked engine when i got the car and ABS light, i fixed the checked engine light and the ABS already , everything was fin for last week and westerday morning, but when i tried the car at noon , it wont start i can hear the gas pump, but no starter or crank... also all the lights is fine on the dash board... when i got the car, i found that the old owner har the neutral safety switch jumped, cause the car starts without stepping on the clutch...do you think it is the ignition switch??? thank you