Starts fine, misfire cold, then fine - ideas?

[bherlingo]

Not sure of the exact operation on the Bingo, but operation normally temperature related.

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In case this is relevant - all this was working perfectly until the engine blew a head gasket (big time...properly cooked)- the engine was swapped but retained the fuel pump - it all started from this point.

The above puts a slightly different slant on it, adds a few more dolly mixtures to the liquorice allsorts!
Do you know the history of the 'new' engine? who fitted the pump to the engine? Could be a case of incorrect pump timing. Black smoking can be a sign of the pump being retarded / insufficient fuel supply.

Agreed, a mechanic installed it though. Is it possible it could be a timing issue if it only does it for 3 minutes and then runs perfect though? I would have thought it would do it all the time - and it ticks over lovely too. It really seems to be air starvation of some sort but I suppose overfueling amounts to the same thing so...? In the absence of any more ideas I could take it in somewhere different and have that checked

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[quote='divingscubaboy' pid='10038' dateline='1316119567']

Do you know the history of the 'new' engine? who fitted the pump to the engine? Could be a case of incorrect pump timing. Black smoking can be a sign of the pump being retarded / insufficient fuel supply.

The procedure followed was;
before removing timing belt the cam was locked with 13mm bolt, crank pinned and fuel pump locked. Replacement engine arrived locked by cam and crank but pumpless - old pump fitted in locked position and new Dayco cam belt kit fitted.

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Black smoke only during the 3 minute warm up (if you try to rev it) then none at all after that and none if you leave it to tickover at any point