3 of my 240s - an 87 driver, and 86 & 89 parts cars - are suddenly hard to start.

All 3 used to start after a few turns - in hot and cold weather. Now:

1) The 87 turns for 30-60 seconds, no hint of firing; then suddenly catches, idles fine and runs smoothly as it warms up.

2) The 86 seems to turn forever without firing but there's a trick: if you release key, then shut off and wait a few seconds it fires (but won't start) on the next try. Repeat this a dozen times and the car starts but stalls (and restarts easily)unless it warms up.

3) The 89 is like the 86 above but it takes fewer tries and it's drivable as soon as it starts.

I expect that it's co-incidence that all 3 cars started doing this at the same time. I expect it will be a fuel-delivery issue - perhaps a combo of a bad cold-start injector and poor fuel pressure.

All 3 share one characteristic: if warmed up completely and then shut off for 20 minutes or so, they are as hard to start as when they were cold. I usually associate this with a leaking injector but there's no smell of gas this doesn't usually cause hard starting when cold.

Anyone see a pattern in any of this? It could be that all 3 have leaking injectors combined with a separate hard-starting issue.
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85-92 240s/ 245s - parts cars & drivers