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I have an 1990 K3500 Auto 454 and suspect the ECM is bad.
Looked up the part numbers and these two come up:
EM7747 and EM8747
Took a picture of my ECM EM8747 but am curious if anyone knows the difference between the two.
My guess:
A/C control or Federal Smog or Man Trans vs Auto Trans.
Looked up the part numbers and these two come up:
EM7747 and EM8747
Took a picture of my ECM EM8747 but am curious if anyone knows the difference between the two.
My guess:
A/C control or Federal Smog or Man Trans vs Auto Trans.
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