Question about Volkswagen Golf

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My golf mk4 stalls while driving

I've replaced the engine speed sensor ,both cats and down pipe,egr valve,coils,ail,oil,fuel filters,cleaned map sensor,can sensor

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Have you done basic tests, such as fuel pressure? Coolant temp sensor? Crank sensor?

Posted on Sep 28, 2016

  • Andrew Dunn
    Andrew Dunn Sep 28, 2016

    Crank replaced , coolant and map not yet but will do in morning have replaced everything to do with power train except map and coolant sender ,,thanks for your help

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What engine is this? If its a 1.9 Diesel then the likely cause is a failing Relay 109 which causes intermitant stalling then eventually non start symptoms.
Relay 109 powers:
- Glow plug relay
- Fuse 32
ECM
Fuel quantity adjuster
- Fuse 34
Cold start injector
Waste gate bypass regulator valve (N75)
Change over valve (N239)
EGR vacuum regulator valve (N18)
Mass air flow sensor (G70)
- Fuse 43
Clutch vacuum vent valve (if equipped)
Brake vacuum vent valve
Relays for preheating coolant (if equipped)
Crankcase ventilation heating element

The ECM supplies power (and sometime ground as well) for:
Fuel cutoff valve
Cruise control switch
Manifold (intake) air pressure/Intake air temperature sensor
Needle lift sensor
Engine speed sensor
Engine coolant sensor
Closed throttle position switch (part of "go" pedal)
Kickdown switch (part of "go" pedal)
Throttle position switch (part of "go" pedal)
Fuel temperature sensor
Modulating piston displacement sensor

The ECM also communicates to the instrument cluster electronics and transmission control module (on automatics).

As a result of this, you can see why if the relay starts to cause power to flicker, or voltage drops, for all of these components, the results can be "unpredicatable" and none of them desireable. Relay 109 part number 1J0906381A, £20.00 Main dealer

Posted on Oct 20, 2016

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Posted on Jan 02, 2017

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