A4 2.8 starting issues

[Dildaxa]

Hi All,

I need help please, my A4 B5 2,8 has been running sweet with only 73k for a 98 model, but a few months ago after a run on the motorway I parked her up no problem, the next day trying to start her was an epic and when she did go the engine was spluttering and could not hold a decent idle speed. I also noticed the accelerator had a delay when pressed.

At the time I did not have my Vagcom tool, and reading the forums and similar experiences i thought I would look into a few possibilities, so I changed the starter relay, fuel filter and the fuel pump. when I did the diagnostic it showed and intermittent fault on the MAP, so I changed this.

After this she will start on the first attempt and then run smoothish, but as soon as she is switched off then she does not want to know.

I have considered whether it could be the temp sensor as that has been mentioned about causing starting issues.

I did another diagnostic and now it is giving me different readings as below, it is racking my brain now and I cannot drive her as I know she may not start when stopped.

Help as I miss driving her.

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Address 01: Engine Labels: 078-907-551-ACK.lbl
Part No: 4D0 907 551 R
Component: 2.8L V6/5V MOTR AT D02
Coding: 04251
Shop #: WSC 00353
VCID: 3566B9FB0F52D196BE-4A3A

2 Faults Found:
17967 - Throttle Body (J338)
P1559 - 35-10 - Fault in basic settings - Intermittent
17973 - Throttle Actuator (J338)
P1565 - 35-10 - Lower Stop not Reached - Intermittent
Readiness: N/A

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 8D0 927 156 BE
Component: AG5 01V 2.8l5V RdW 7803
Coding: 00000
Shop #: WSC 00000
VCID: 71EE4DEB3BBABDB6A2-4A3A

2 Faults Found:
18265 - Load Signal
P1857 - 35-10 - Error Message from ECU - Intermittent
00526 - Brake Light Switch (F)
27-00 - Implausible Signal

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8D0-959-655-AI7.lbl
Part No: 8D0 959 655 L
Component: Airbag 7 Audi 0503
Coding: 00104
Shop #: WSC 06435
VCID: 3F8ADBD33D6E1BC664-5000

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

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8D0-919-xxx-17.lbl
Part No: 8D0 919 930 J
Component: B5-KOMBIINSTR. VDO D03
Coding: 20462
Shop #: WSC 00353
VCID: 3566B9FB0F52D196BE-50E6

Subsystem 1 - Part No: IMMO
Component: IDENTNR: AUZ7Z0W0345814
IMMO-IDENTNR: AUZ7Z0W0345814

1 Fault Found:
00771 - Fuel Level Sensor (G)
30-10 - Open or Short to Plus - Intermittent

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

[elduderino200]

After this she will start on the first attempt and then run smoothish, but as soon as she is switched off then she does not want to know.

I have considered whether it could be the temp sensor as that has been mentioned about causing starting issues.

This sounds like a classic temp sensor issue, but this:

17967 - Throttle Body (J338)
P1559 - 35-10 - Fault in basic settings - Intermittent

Sounds like it just needs a throttle body adaptation - which I believe only takes a minute or two with vag-com and costs nothing. Start with that and if there's no change get a new coolant temp sensor?