Turns over wont fire help please

[cris654321]

mechanical guru's please help my girl friend needs to get to work on Monday

vw polo 1.4 petrol 2005

turning over wont fire

fuel pump whirring when turn key

checked fuel rail pressure, not got a proper gauge but spurts out fuel then stops with just ignition on not turning. I haven't tested while turning over, should I?

tested one individual coil pack wasn't sure which terminal was which, so tested all 4, 3 had nothing, 1 had 12v with just key then dropped to 6v when spinning over (not sure if thats correct or not.... the fact there is power there at all rules out crank or cam sensor????)

I would like to look at a spark plug while turning but dont have the right socket to remove the spark plug

the oil is right level decent colour no leaks I can see no oil or mayo in the coolant coolant is clean

battery is not flat but boost pack on anyway and no difference

cambelt was changed a year ago iv looked at the belt all looks tight and right

have tryed plugging a cheap OBD reader in but says it wont connect this may be the reader at fault although it is quite new

what else can I test or try??

thanks in advance for any help

Chris

[cris654321]

Steve H said:

Two tests that you should do next -

To check for a spark remove a coil and put a bolt or short metal rod into the end where the spark plug would go. Rest the coil against the engine bock so the end of the bolt is around 5mm from the head (wiring plug still connected to the coil). Crank the engine and you should see a spark.

To check if the injectors are being triggered hold a long screwdriver to the body of one of the injectors and (get someone to) crank the engine while listening to the end of the screwdriver. You should hear a sharp ticking noise coming from the injector body. Yep, really, I st you not.



Chances are one or both of these things will be missing, report back.

Thanks those sound like logical things to try I will do them today and update later.

GreenV8S said:

Diagnosing a modern engine without the right tools or any knowledge of how it it supposed to work is going to be extremely difficult. Without any disrespect to you, the best advice you can give your GF is to take it to somebody experienced and equipped to diagnose this sort of thing. That might mean calling out your breakdown service (if either of you have one) or finding a friendly local mechanic.

I know I sound like a moron on here but I do understand the very basic processes of an engine just not really done any diagnostics before. I have done alot of work on my own cars. I just like learning how to do things. Getting someone else to do it is the easy way ha ha, teach a man to fish and all that