Originally Posted by danjamesjr
Thanks! It'* Gen II.
I would love to know the test procedure for EGR valve. I took it off and cleaned passage way.
A mechanic also mentioned it could be the ECM? I guess it'* common for the computers to malfunction in Century'* (Gen II)?
OBD-I ECM'* do tend to fail more then most OBD-II ECM'*.
Gen II vs Gen III in a 1994 Century the ECM'* have about the same fail rate. Both are OBD-I ECM'* with e proms.
Older OBD-i ECM'* some have a single Prom, some have 2 smaller proms. One of those is called a Calibrator.
When you buy a "New" or likely "Re-Manufatored" ECM even from a GM Dealership it will not come with the E-Prom. Often the prom fails with the Computer. Just replacing the computer often does NOT fix the issue.
Either find a good used ECM or buy a nbew one, and find a new E-prom. That is if your going to replace the ECM. Don't replace the ECM for no reason. Narrow down via diagnosis if your ECM is the likely cause.
As for the EGR valve you posted: 1993-1997 3 solenoid style. the test someone posted is a single solenoid style.