I have a 1990 Trooper with the 2.6L, 4cyl. I changed the injector O-rings
today which requires plenum removal. After reassembly the truck started and
ran fine. After about 10min of running it started running bad and the check
engine light came on. I tried to read the ECM but when I connected the two
diagnostic wires together and turned on the ignition the check engine light
came on but did not blink, it just stayed on. I checked over the engine real
close to make sure all vac hoses and wires were connected. I found a wire
that was loose. I tightened it but nothing has changed. Now the truck will
not start at all. The wire I found loose had 3 wires going into 1 eye. It
connected to the front side of the intake. With the key on and this wire
unhooked, the check engine light does not come on, but the truck still will
not start. I think I may have fried the ECM but I would hate to go buy a new
one and that not be the problem. Also while checking all of this I found the
transistor under the intake was so hot that it would burn you.
Does anyone have any ideas?