Sorry for the delay in answering. I tend to have connection problem only on Fridays. Seems my ISP wants to rest on Fridays :(.
ECT is located in coolant pipe at rear of right cylinder head.
NOTE: Vehicles may be equipped either a square or rounded ECT sensor.
However if sensors are faulty, it could have the fault recorded in the ECM. I would sugggest getting a scan done to check if any codes are stored.
Most large parts outlets provides the scanning service either free or for a nominal fee. If any codes are found, let me know the exact trouble code.
One thing that you should do is to check what is missing when engine could not be started. From there we would have an idea what could be the cause.
I have a link here which would be helpful and check the link that aptly describes your condition. Check them out and let me know what you find.
Saturday, June 20th, 2009 AT 9:34 AM