I have this 94 Century that has the 3.1 V6 in it.
I keep having the Check Engine light come on.
I have a scan tool, so I can find out the codes, and it is always an EGR code.
It has the digital EGR valve on it with the 3 solenoids.
It varies as to which solenoid it says has the problem.
Recently, I took the EGR valve off and took the base apart. I cleaned out all the carbon (there wasn't much anyway) and just made sure things were generally not stuck and the parts inside were free to move.
However, I continue to get the Check Engine light coming on and it is always an EGR code (P1403, P1404, P1405).
I don't understand what is wrong here, nor do I know what to check.
Does anyone have thoughts on this? What might be wrong? What should I check?