I just got my 92 3VZE 4x4 xxtra cab truck back from the mechanic (for head replacement). After about 20 miles of driving, the "check engine light" came on after about 5 miles of highway driving. I stopped, checked it out, and after convincing myself that it wasn't anything major drove it home.
I checked the OBD I codes and then cleared them. They were 14 (no ignition reference signal) and 71 (EGR system malfunction). The first code is listed for possible problems with the ignition coil, igniter or circuit, or ECU. The second code has possible causes listed as EGr system, EGR temperature sensor ofr circuit, EGR BVSV (i assume the valve?) or VSV(?), or ECU. I drove another 5 miles to get the codes to show again, but they never reappeared.
Does anyone have any ways of narrowing down either one of these problems or at least a good manual that I could buy that has these procedures in them?