This has been ongoing for months and slowly getting worse. I drive the car on weekends around a thousand miles. It runs perfectly after I replaced spark plugs, no misses once it runs. It used to hard start only when warm or warm weather, now it seems to be always. I thought maybe was a coolant sensor or something reporting bad. What makes this tricky is it runs PERFECT once it starts. I thought fuel pressure issues but I have cycled key and things like that without help. It takes anywhere from 3-10 seconds to start most of the time now. Fresh battery fast cranking.

Any ideas what this could be? It's gotta be some sensor; has 140k miles now so getting up there. The fact it runs so good once runs I can't think of any mechanical issues that would cause or any fuel injector or things like that. Thoughts? I need to plug into it and see what sensors are reporting for coolant temp, ambient air, MAP, etc. I think these don't have a MAF right?

Thanks!

 

My guess is the fuel pump on its last leg.

 

Wouldn’t that mean there would be power loss or hesitation while running? It never does. I was thinking maybe fuel pressure regulator. This afternoon it started flawlessly when it was colder and windy about 50F. Doesn’t make sense.