Hot start on hot days

[Blackdevil77]

Hey all. I have a Pontiac G8 GT with a cam, stall, headers exhaust and tune. On hot days when the sun is blazing and it's in the mid to upper 80's to low 90's, I notice the car has a hard time starting up when it's warm. The rpms will flair to maybe 350 400 rpms, then shudder, drop and die. I have to gas it to get it to start up and when it does, the idle dips then flair's back up occasionally until I start driving around a little. What would be causing this? I know some timing is being taken away due to IAT's, but that alone I don't think is the problem. Anybody else have this problem? Is it too much cranking fuel at that temp?

I would post the tune but I didn't tune the car so I don't want to post it without permission. Just looking for ballpark answers and opinions

[mike72678]

Try increasing the start up aiflow values and Main Spark advance cranking values.

[Blackdevil77]

Thanks, I will give that a try. I just made the changes to the tune, now just gotta upload it