New motor won't start.

[hayesey]

yup king leads brand new aswell

but have you tried swapping it for another one? new doesn't necessarily mean it works

[dub-disaster]

Will try old king lead, have buzzed out the cables between the ecu and the coil connector (blue black) all where fine which I'm assuming is the coil driver is there any way to check for signal maybe with a scope ??
Also read this thread on club polo which identified the drive transistor giving similar problems I've pulled mine out and checked it although it seems fine I'll replace it any way though( also checked all other transistors in the ecu all are fine) hopefully I'll try jezzas ecu.
I'll report back how I get on.

[Jezza-7]

Will pop round tomorrow with my ecu mate.

[dub-disaster]

Ok this is an update,
Today I refitted the ecu and dizzy and with the ignition on and with the dizzy removed but the hall sender still pluged in when I rotate the dizzy I can hear the fuel pumps running then stop when I stop turning the dizzy by hand. I'm testing it like this as my battery doesn't like all the cranking and is probably going to die soon. I also disconnected the injectors as I didn't want to fill the oil and motor full of fuel.
 
Other checks done today include I checked for voltage at the coil and there's 12.5 volts

I connected a scope to the output from the ecu to the coil (green and black wire) and ground when cranking the engine I am getting a signal, amplitude looks like 20-40mv but my scope reading is pretty rusty not sure if this is enough I was expecting more like a couple of volt signal. I will upload the picture later for any one else to give an opinion weather the signal is big enough for the amp.

I also checked the coil again as it appears that the coil is getting supply voltage and a singal to fire I did this by using an old coil still no spark i also connected an old ht lead directly to both coils still no spark. Not sure weather this would work as the rotor arm has a resistor in it if I remember correctly but thought if anything this would just blow the spark plug up both still nothing.

So to conclude I think the hall sender is functioning correctly as the fuel pumps fire when the dizzy is rotated with ignition on. There is voltage to the coil and a signal (of some form) from the ecu but still no spark from any plugs on any cylinders using old or new leads on either of the coils.
Any ideas??

[dub-disaster]

if you ignore the voltage reading in the top left hand corners as i dont think i had set the scope up correctly for these to read the peak voltages only. these two pictures are both of the signal that is obtained with the ignition on with everything connected and manualy turning the dizzy by hand. Volts per division shown in the bottom left hand corner along with time per division.

Does any one know if these are the sort of readyings i should be getting or if this is not a sufficient signal to drive the amplifier in the coil?

i may also if i have time before work just hook this scope up and see what signal the hall sender is giving to the ecu.Although i dont think this is the problem as the injectors are firing, it may be worth comparing the signals as im assuming they should be roughly the same.

[Andy]

I think the coil driver output is a low-side drive - that is to say it's a switched ground. So you'll need to stick your meter neg/ground probe to the output, and the positive probe to +12V.

[dub-disaster]

Ok I'll give that a go 2mro, cheers Andy any idea way the signal should look like on the scope? And is the signal from the hall sender A low-side drive aswell?

[Jezza-7]

Any more news dude?

[dub-disaster]

For anyone intrested Fitted jezza's ecu problem solved instant spark.

[Jezza-7]

Sweet! You fired her up yet?

[dub-disaster]

Not yet mate, was going to do it today but I had to work so I'm going to do it 2mro afternoon then I'll whip the leaky rad of have that fixed and get it mot'd on e the new ecu turns up

[dub-disaster]

Another update, found out today whilst mucking about with my old ecu is actualy the new chip that's faulty not my ecu.

[Jezza-7]

Hey i said it was your chip!

[dub-disaster]

I must of not pushed the old one in hard enough when I changed it for fear of breaking it !! Hopefully I'll get a new chip in time for mot and I've got a spare working exu now as I bought one .