Just a note on this old thread* -- the cold start injector disappeared from the 240 after '91.
Even so, an open circuit in the engine coolant temperature (ECT) sensor would definitely be one good reason the car would be difficult to start, hot or not. The crusty connector is just as often the cause as is an aged sensor, and it should identify itself with a 123 DTC code from the OBD.
* this thread was duplicated here https://www.brickboard.com/RWD/volvo/1668536/220/240/260/280/93_240_hot_start_issue.html
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Art Benstein near Baltimore
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