VW Golf 5 1.9 Engine cut when running

[brk3257]

Hello friends.

GOLF 5 1.9TDI stops when engine is warm (i think), impossible to restart engine again.
Symtoms:

- NO DTCs present (engine or other modules)
- NO warning light when engine stops, only battery light is on
- Engine stops when release accelerator
- I can run without any problem until 90C engine temp
- When trying to restart, cranking more than 30s and oil light blinking, after oil light the engine start hardly (shaking/vibration), after 5 sec, engine is fine at idle.
- When i continue driving the car, engine stops again after some time
- Engine runs fine without cut off when the car is not on the road, also tried ~3000rpms for about 15mins, no problem (parked at idle)
- pump in fuel tank is replaced, not fixed the issue
- Crankshaft and camshaft position sensors are ok (i think) because they have values in parameters mesurement and sync is ok (when engine running)

Before replacing fuel pump, injectors or other think, i need help to understand what is exactly because there is no dtcs, anyone have similar issue?
Please help

Thank you

[huwalsh]

Had couple 1.9 vw`s where ecu would develope no communication when warmed up , probably solder joint issue.
Do you loose communication with ecu when no start ?
Had to walk to shop when one of them broke down on test drive and buy a bag of ice cubes covered ecu waited five min and fired right up

[fuzz1]

Hi
Just switch on the engine and warm the ECU with a heat gun.

[brk3257]

Had couple 1.9 vw`s where ecu would develope no communication when warmed up , probably solder joint issue.
Do you loose communication with ecu when no start ?
Had to walk to shop when one of them broke down on test drive and buy a bag of ice cubes covered ecu waited five min and fired right up

Thanks for reply
Communication is fine with engine ecu when the car stops, i will try to cover engine ecu with ice bag of ice and i post here what is happening

[brk3257]

Thank you
I will try it also and post here the result

[rui]

Have you tried changing the relay that powers the engine control device that gets hotter it can turn off....

[brk3257]

Had couple 1.9 vw`s where ecu would develope no communication when warmed up , probably solder joint issue.
Do you loose communication with ecu when no start ?
Had to walk to shop when one of them broke down on test drive and buy a bag of ice cubes covered ecu waited five min and fired right up

Hi
Just switch on the engine and warm the ECU with a heat gun.

Engine ecu tested with ice and with heatgun, the car doesnt stop with heatgun and doesnt start with ice.

[brk3257]

Have you tried changing the relay that powers the engine control device that gets hotter it can turn off....

Already tested this relay, when i pull out, engine ecu is not accessible from obd diag, and when car stops, engine ecu is accessible soo i think this relay is good, very hot but working

[huwalsh]

Ok so if communication is maintained when engine cuts out it is unlikely to be a ecu fault. I think this would be a pd engine.
Pump in tank replaced pipes wrong way round ?
How is engine oil level , smell of diesel ?
Seals on injectors leaking in head or tandem pump seals can leak also.
Check idle stabilization on live data and look at change as engine heats up.
Tandem pump has a test port to check pressure. Think oily fuel filter is sympton of failing tandem pump.

[brk3257]

Ok so if communication is maintained when engine cuts out it is unlikely to be a ecu fault. I think this would be a pd engine.
Pump in tank replaced pipes wrong way round ?
How is engine oil level , smell of diesel ?
Seals on injectors leaking in head or tandem pump seals can leak also.
Check idle stabilization on live data and look at change as engine heats up.
Tandem pump has a test port to check pressure. Think oily fuel filter is sympton of failing tandem pump.

Thank you very much!!!
Pipes on the pump in tank was wrong, i switched pipes and car run without any problem

[huwalsh]

Ur welcome as a "newbie"for future reference and to get further help on DK hit the thanks button on any helpful posts