Long Time Cranking on Cold Start

[madtown986]

I have a 2002 Boxster S currently at 32000 miles. Mostly stock (Numeric shifter and cables are my only mods). I am pretty sure everything else on it is factory original.

When I bought it three years ago, it took a long time to start and was very weak cranking. Within three days of getting it home, it wouldn't crank at all. It turned out the battery was 11 years old. I replaced the battery and it's started nice and strong ever since. Turn the key, a couple cranks (about 1 - 2 seconds) and vroom - it's running. Instant like you expect from a new car.

Until a couple weeks ago. I had one or two cold starts that took a few moments longer than usual to crank. It cranks strong, it just took a little longer. It happened once, i didn't worry about it. Then it happened again. Maybe every 5th start or so it cranked a little longer before turning over.

Now it is happening every two or three starts and cranking for 3-4 seconds before starting. Those cranks are strong. It's not weak starting at all, just slow. It's mostly cold starts but it has happened once or twice on a warm start.

Fresh oil change within the past month. Oil level is good. Battery cables are tight. 93 octane gas from mostly the same place every fill up since i bought it. Once it's running, it runs well. No hesitation, mis-fires, ticks, or extra noise etc.

I'm in the deep south. Temps are warm lately (70-80F). It was starting faster during the winter.

Looking for ideas of where and what to investigate. Do these have a cold start injector specifically for cold starts?

Thanks in advance for any and all advice!