Wont Start....HELP PLEASE!

[Callum_K]

Okay read through it again....if you are getting nothing from the middle pin on your crank sensor (best to test with an led tester) when you turn it over then it isn't working. That sends a signal to the ECU, if it doesn't get one, it won't fire! Just to add, crank sensors can be fine until they get hot after a few minutes and then fail! Or even just be randomly intermittant.

[analogue_rogue]

Did you test ignition spark thing we discussed? Rule one thing ou at a time.

[analogue_rogue]

Okay read through it again....if you are getting nothing from the middle pin on your crank sensor (best to test with an led tester) when you turn it over then it isn't working. That sends a signal to the ECU, if it doesn't get one, it won't fire! Just to add, crank sensors can be fine until they get hot after a few minutes and then fail! Or even just be randomly intermittant.

Sorry i posted in between your posts lol.... Crank sensor was next to test "tag team high five your turn"

[davidopresto]

i dont know where the ecu relay is so no i havent replaced it 
Where is it located?
And if replacing the ecu relay might have something to do with it then yes id be more than happy to take it off your hands 
Right when i have an extra set of hand free later on ill try the middle pin while cranking

I have tested to see if i get a spark when putting ignition on and off etc. I turn ignition ON, nothing. As im turning ignition OFF theres a spark

[GOLF-MK3-GTI]

Ecu relay is in the fusebox, it should be black or White, number 30 stamped on it, fusebox is near the steering column.

[davidopresto]

i knew the ominous fuse 30 was a common problem, didnt know that was the ecu relay 

[analogue_rogue]

ok.. so we know that when it has its fault..

1) the coil is being energised normally.

2) when the ignition is turned off the coil is discharged through the distributor.

3) when cranking there is no spark.

This means. we know the coil works, we know the wiring to the coil is good.

We know that when the engine is static all of the parts required to create a spark are inline in the circuit. (IE hall sender is closed, ign amp is in circuit and amp voltage and the ecu is sending the correct signal to prime the coil)

What we don't know why the coil is not discharging and recharging during cranking.....

I don't have an ignition diagram for this engine has anyone got one they can put up in this thread?

[Callum_K]

PM me your address and I'll send you the relay. It may not be the problem but it's always worth having a spare as they break!

PS My money is still on crank sensor. So common for them to go it's the first thing I would try....

[GOLF-MK3-GTI]

Crank sensor. When it dies does the oil light flash? or even when you try to start it after its cut out, Does it flash then?

Also when does it give you a problem, when engine is hot or cold?

[dixie180]

Hmmmm,like i said before always start with the cheaper options ie;relays etc, instead of more expensive ones like Distributor,MAF,Coil.But heyho you decided to choose the more expensive option first.Only trying to help m8 and i have been down the same road as you with the cutting out/stalling problem.Change fuel pump relay167 and ECU relay 30. .Also like GOLF-MK3-GTI said if your car cuts out with "flashing oil light" then i would also suggest Crank Sensor fault.