hijet van 1998 running really rich

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I have a 1998 hijet van which i have painted in the style of the scoobydoo mystery machine, with all the relevant stickers etc.
Problem is I can't get it through its mot due to the emissions being off the scale. Its had a new exhaust and cat(ouch), new lambda sensor, new(used)ECU, full service etc, new thermostat.Its got to the point where it would be too expensive not to fix it the amount ive spent.

My mate whos a mechanic suggest the cold start sendor, trouble is can t locate it??, Any one got any other suggestions??
Its the 993cc EFI version.

Please help me .....sob
I love the van and want to further convert the inside, but only if I can drive it lol

RUNNING RICH

I HAD THE SAME PROBLEM ON MY 1996 993CC HIJET.
FIRST THING TO SAVE YOUR SELF A LOT OF CASH DON'T RUN THE VAN UNTIL YOU HAVE THE FUELING PROBLEM SORTED, THAT WILL KILL YOUR NEW CAT AND YOU WILL HAVE TO BUY ANOTHER.
SECOND, I TWO THOUGHT IT WAS THE LAMBDA SENSOR AND THE COLD START THING. IT TURNED OUT TO BE THE VACUME PIPES.
THE SHORT STORY IS THE KEEPER BEFORE ME HAD THE HEAD GASKET DONE BY A BACK STREET GARAGE. WHEN THEY PUT IT BACK TOGETHER THEY PUT ALL THE VACUM PIPES BACK ON WRONG CAUSING THE AIR FUEL MIXTURE TO GO WAY OFF. PROBLEM IS YOU NEED A MANUEL OR IN MY CASE THE BIG BOSS FOR THE DIAHATSU DEALER LOCAL TO YOU TO POINT IT OUT.
P.S. MY VAN IS THE 993CC EFI SAME ONE