Hi first post here so please be nice :-)
I have a 1600 ecotec zafira with 20000 miles on the clock, it is
driven sedately by my other half and caned by me! The problem is that
it has started missing occasionally.
It doesnt matter whether the car is hot, cold, under load, or not it
will just start to run rough or sound like it is running on 3
cylinders it also loses power when it happens, but it never stalls and
there is no error lights on the dashboard I have tried multiple basic
fixes but I now need more help on what to do next,
So far I have
Changed the fuel (from Morrisons to Shell Optimax)
Changed oil (10/40)
Checked and changed spark plugs
checked the air inlet and filter were clean
and I have revved the Knackers out of it to ensure it is not a sticky
it doesnt seem to be using more fuel
okay start the car at night(dark) and open the bonnet and look into the engine bay to see if you can see any sparks jumping(will be small) this would point to an obvious leccy problem,look around ht leads,dizzy cap and coil.
if that fails take dizzy cap off and check the contacts inside it+the rota arm condition.
are all plug leads a solid connection at both ends?and at the coil?
what do the plugs look like,normal light brown covering?black and sooty?white?
check for head gasket failur,unlikly with the miles its got but worth checking.
are all fuses okay?
let me know how you get on with this little lot mate and if you are unsure of any of this let me know
HAHA there is no leads rotors or dizzy, just a big black resin and plastic box that sits on the rocker cover and plugs directly onto the plugs! anyone know how to test this thing I think its a coil pack of some sort