I drove to work in the morning with no problems, when it was time to leave 10 hours later my car would crank but not start. I have no security lights on or flashing, but even tried the security relearn procedure with no luck. Since, I've found that the car will only start if I disconnect the battery for at least an hour; then it will restart as long as the engine is warm. Once the engine is cold, it will crank but won't start until I disconnect the battery. I have 52 psi fuel pressure with the car cold, hot, not starting or running. No codes are showing when the car is cold, hot, not starting or running. I've load tested the battery and it tests good. I've tried disconnecting the battery for 15 mins only and the vehicle won't start; only starts if I have it disconnected for at least an hour.

Is there a sensor or module that is temperature operated that would prevent the car from starting when cold but resets when power is disconnected for at least an hour?

try disconnecting the maf and if it starts the maf is bad. what engine?

I disconnected the MAF and it still doesn't start when cold. I just checked, I had 13v at the ICM before and during cranking. It'* a 3.4L engine that still wont start unless I disconnect the battery for an hour.

you check for spark when its not starting? you have a scanner with live data?

I have found that a mouse has chewed through my wires for the injectors. I took the intake off and found a nest under it. I repaired the wires and put everything back together and it didn't start. I disconnected the battery to clear and about to hook it up and try a start. I have a scanner that captures live data; it shows nothing wrong. I have spark; also checked for power at the ICM; it has constant power.

thats certainly a new one, i couldnt figure what would be wrong with it. there is probably a fuse or relay that is shorted that feeds the injector hot, or there are more wires they got to.

Looks as of now, it is fixed. Repaired the wires and changed the fuse that had blown and it starts now. Thanks for your help!!!

thanks for the update

Hey guys, I know this is an old thread but my grand am is doing the exact same thing. im not really sure what fuse you are talking about that you replaced.
if either of you could get back to me it would be greatly appreciated. thanks a ton.