It sounds like there is a relay or the ecu is not working when hot but here is were the relay box is on your car, Under hood, driver side, front side of strut tower, mounted on fenderwell when it is not starting you should see a ignition relay in that box pull it and with volt ohm meter check for contonuity and see if yuour getting voltage to that relay put on 20 volt and see if your getting 12 volts if not it would be the ecu and when it gets hot it shuts down till cooled off the ecu is located Under hood, driver side, front side of strut tower, mounted on fenderwell and now that I think about it it could also be the ignition control module located Under hood, passenger side, upper engine area, end of intake manifold, mounted in distributor
now try this test
Fig. 1: Ignition coil terminal identification-3.0L Premier and Monaco engine
If voltage is at near-battery voltage, and drops to zero after 1-2 seconds of cranking, refer to for diagnostic trouble codes and further testing.
If voltage remains at near-battery voltage during the entire 5 seconds, turn the key OFF and remove the Single Board Engine Controller (SBEC) 60-way connector. Check the 60-way connector for any loose or pushed out terminals.
Tuesday, October 28th, 2008 AT 8:59 PM