Hi guys, my 350z will start just fine from cold cranking, but it will take forever or not start at all when it is hot, or has been standing for a few minutes after driving....E.g going into shops, or fuelling the car.

Is this a tuning issue, fuel mix too rich for hot engine restart???

I have the original Utec Turboxs piggyback ECU running it, any ideas where/how to correct for this heat sink? I'm sick of leaving the car for an hour or so, waiting for it too cool so I can start it again, or cranking it till the battery dies and I'm left stranded.

Any help would be great.

Cheers

 

Not to overstate the obvious but you should check the resistance on your coolant temperature sender when warmed up. If resistance is either 0 or infinity the sender is bad.
If the sender is good, trouble shoot like it was N/A. Air filters clean, injectors serviced?