Originally Posted by StealthAssassin
I have a early 99 and replaced the motor to a 02. Runs fine. PCM is xle4 and I sometimes have weird issues anyway like lights clicking in dash, battery drain, etc... Comes and goes.
Question is can and or should I upgrade to a newer PCM and which one?
The PCM will have nothing to do with this. Only issue you should have is getting a SES code for the AIH.
Is the 02 a California motor with a glow plug controller box? Are the glow plugs turning off? Did you move over the engine harness from the 02?
A glow plug draw will drain the batteries.
Need more info on the motor swap.
Hope this helps.