then I read some ones bongo starts within 1/2 a second of turning the key
ahaaa same as mine

1/2 a second ? has it even done a revolution by that time ?
im on for year 9 and had the same plugs in
she still starts within that second - cold or hot
coughs a little every now and then - but a quick rev and all sorted
are all diesel bongo,s the same
ps- not rubbing it in if you have any issues etc
so how many seconds does your take to fire up ???

and mine has the twin battery set up - but only 11 volts when turning ignition on in the morning ( I think if it was just the one battery - there would be trouble ) lol
