Hi, i was reading your question and wasnt sure if you were still looking for help?
just a thought that occurs to me, most vehicles will NOT run the computers emissions monitor self tests if the engine coolant does not reach full normal temperature. Id like to suggest you check to make sure the thermostat is in good working order, not stuck open or closed. and that the engine is reaching full operating temp, warming up in the proper amount of time.
Let me know if it helps you out!
nope that didnt help it wont let emission plug in and acess computer to read i ave drove the 200 to 300 miles plenty of water not over heating city and high way it just wont complete all of it checks and work normal and didnt have problem intil i had a new heater core put in and i pulled all my fuses out of the fuse box to look for a bad fuse to get a cigerette lighter to work and all this started