starting problem

[kty50n]

Hi all

I start my k reg G40 the other day, it started i touched the throttle the vehicle then back fired ran for about 30 sec the cut out.

i have change the coil pack as there is no spark, that made no difference.
what else do i need to check.
thanks Keith

[hayesey]

Hi, welcome to the forum.

so is there still no spark?  Are the spark plug, ht leads, rotor arm and dizzy cap all ok?  The coil you've put on, is it a new one and/or have you tried it on another polo to see if it definitely works?

When you try to start do you hear the fuel pump at the back prime (make a short whirr)?

[PeteG40]

could be the hall sender in the dizzy or an ecu relay (they both have a habit of giving an intermittant fault)

does it crank and turn over??? or just do nothing when you try to start it?

[kty50n]

[quote pid=1902 author=peteg40 date=1214295837]could be the hall sender in the dizzy or an ecu relay (they both have a habit of giving an intermittant fault)

does it crank and turn over??? or just do nothing when you try to start it?[/quote]
I removed the main lead from the coil and earth it to the engine and got no spark, so I thin the dizzy is ok, the vehicle will crack over and I use a new coil to check.
I have not checked the fuel pump yet but I will do
the ECU relay what colour is it and is it next to the ECU?
Thanks for responding so quickly
Keith

[PeteG40]

its one of the two relays next to the ecu

[PeteG40]

it sounds like a poor ground or poor coil to be honest

[kty50n]

thanks for the help.  it was the dizzy

Keith