Engine died twice...

[Lloyd]

OK. Eventually got the codes checked.
00515 Hall Sender G40, Sporadic: Short circuit to earth.
00544 Maximum Boost Pressure Exceeded. Sporadic: Implausible signal
00513 Engine Speed Sender G28 - No signal

Full marks go to Rich (Hoffer76) for correct early diagnosis!

[prj]

Yeah, replace the Hall sender, but first check it's wiring and connector and make sure they are OK.
Pretty sure the other code is because it goes into limp mode without Hall sender signal, and that has much lower boost threshold.

[Lloyd]

OK - thanks for the tips. Apart from unplugging, plugging it back and a general visual is there anything specific I should do re the connector?

[Lloyd]

Lloyd: When you get the G40 Hall sender, there is a link to a DIY by Nate P (ImQuattro) in this G40 info post:

http://forums.quattroworld.com/s4s6/msgs/22580.phtml

Great link - thanks

[prj]

The wires are usually not soldered to the pins inside the connector, they are just crimped.
I would just try and solder them, that has fixed many MAF connectors for me in the past.

[pixsaudisex2]

Spark plugs tight,

[Lloyd]

OK. Fitted new Hall Sensor. Drove 65 miles and the engine died yet again.
So, its seemingly random but the problem remains..

Have inspected the loom Hall conector, looks ok. not yet managed to solder the connectors.

Guess its back to the drawing board for ideas. will check codes again next week.
I'm mid road trip to Spa so really hoping it doesnt get any worse...

[20Vcqdriver]

Sounds similar to my issue. Does rev counter instantly drop to zero at same time. Just spent 4 hours checking all supplies to my ECU and removed and cleaned contacts on fuel pump relay too that looked a bit pitted. IF sensor and cable checks ok back to ECU pins then start checking all supplies and earths...

[prj]

Nightmare...
Yeah you need to start checking all the wiring.

[A80Avant]

good point on the fuel pump. wiring to that may have something to do with it.

[Lloyd]

Sounds similar to my issue. Does rev counter instantly drop to zero at same time. Just spent 4 hours checking all supplnoies to my ECU and removed and cleaned contacts on fuel pump relay too that looked a bit pitted. IF sensor and cable checks ok back to ECU pins then start checking all supplies and earths...

No, the tacho and speedo keep working.
It might not be connected but the car also sounds like it has a missfire occasionally.
My bro thought it sounded like brief fuel starvation?

Wierd. I appreciate all the help and suggestions chaps.

[irishs2]

Is the 00515 error still showing up?

[Lloyd]

Not had a chance to check again. Waiting on the eBay cables to arrive.

[prj]

Brief fuel starvation might mean the fuel pump relay is acting up or some problem with the wiring.
I remember your car being perfectly healthy when I mapped it Lloyd, so whatever it is, it is a recent problem.

If you have fuel starvation the car will start coughing and then slowly cut out. It will not be instant.

[Lloyd]

Thanks for the advice Dmitri. Yes my car was indeed in tip top order.
Just need to get a fix on this issue. Car has now gone into limp mode.
Only seeing 0.7 bar max boost and feels very flat.

Any more ideas? Thanks.