Perhaps some of you can help me in solving this puzzle. Car is an euro 230E,
engine M102, KE Jetronic, a 14 years old beatiful, reliable machine.

During the first start in the morning, wIth low ambient temperatures (below
15°C / 60°F, winter), the starter turns the engine 4-5 times and then the
car starts normally, very clean.

However, on mornings with higher ambient T° (spring / summer), as soon as
the starter motor turns the engine over just 1-2 times, there are a couple
of misfires (sputtering for a second), after which though the car starts
fine.

When the engine is warm or hot, sometimes the misfires are there, sometimes
not. When I turn the engine on a short while after turned off, there is no
misfire. When I step up the pedal, the situation seems to improve a little.

The injectors are new, so they are not leaking (I guess, before I changed
them the misfires were present).

Could this be a vapor / accumulator problem, preventing the first
ignitions?, even if the misfires happen at first startings (only with high
ambient T°), when the motor is very cold and the fuel lines are supposedly
empty?. Is it possible to have fuel vapor in the fuel lines or in the intake
in the mornings?

Although the car idles fine, I suspected an air leak leaning the mixture,
but the misfires are occasional and if there is a leak, the air would be
always present. I also was thinking about a leaking cold start valve,
however I dismounted it and was an entire afternoon looking if some drops
came out, nothing. The ignition parts and fuel filter are almost new.

I would appreciate if someone suggest me an idea or a possible suspect, or
what to test.

The car always starts, and has plenty of power.

Thanks for any help or advice.
MMansilla