Check your battery cables too. You may have a loose connection there. I've seen a number of oddball issues in cars come from battery cables so far corroded that everything in the car would work but it wouldn't run or start.
Wow, I think at this point I would wire a couple temp light bulbs to the ignition switch so I could watch and make sure the output is there. Or maybe a couple test points for on the fly voltage testing. It sounds like a bad relay or the relay has nominal voltage from a bad ground or flaky ignition switch. At least you now know you can narrow your search a bit. Keep us posted.Family99Odyssey said:A few min later while waiting with the key in the run position I hear a load click, the check engine light and the green key light comes on, I start the van and drive home.
That is an excellent question. I really do not think that the problem is in the immobilizer. The PCM operates the immobilizer. When the PCM is off, the immobilizer is off as well. As the check engine light and the green key light both go off and on together, I look more at the PCM. My thoughts lean more towards a relay or something that powers the PCM.OdyinNH said:So why did it work if you sat there for a few minutes? Seems strange. The immobilizer only worked on occasion?