'91, Cranks but No Start (and radiator fan runs?!)

[mike100]

That said, the fan running is a sign that the ecm is in a weird state- like the diagnostic mode when you plug in the tech1 scanner or like when you plug the chip in backwards on the ecm.

[RussMcB]

Originally Posted by mike100

That said, the fan running is a sign that the ecm is in a weird state- like the diagnostic mode when you plug in the tech1 scanner or like when you plug the chip in backwards on the ecm.

Thanks, Mike. I sent an email to Marc Haibeck last night and he replied with similar thoughts, like maybe it had gone into limp home mode. Marc suggested I check the chip to make sure it is seated correctly. I'll do that when I get to the garage tonight. I've also disconnected the battery and will reconnect it tonight.