Spark plugs, HT leads, distributor cap and rotor arm were new last year, and I regularly clean the IAV anyway.
I didn't know that about the cold start injector only spraying while turning the starter motor - is that peculiar to the 5th injector, or to all the injectors?
I'd just assumed that the mixture was generally enriched while cold-running.
The ECU temperature sensor seems the best easiest check - it came with the car about 5 years ago, so is of unknown age.
I'm wary of removing injectors, but it may come to that. The last (only) time I've done that was on a previous 240 when I suspected the seals were leaking. I found it a nightmare getting them back in again - they took so much force I was worried I'd damaged the new seals.
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