My 1989 Dodge B250 van has a rather rudimentary emissions control system, apparently. The computer is programmed to light an “Emissions Maintenance Required” light every 60k miles, at which time the owner is supposed to replace the EGR valve. I’ve never had to replace an EGR valve before, and with all the $$ I’m having to pour into this beast, I’d rather not replace a $50 part just because an idiot light said so.
My question is, what are the actual symptoms that tell you an EGR valve is going bad? I’m taking it in for a state inspection tomorrow, so if it fails, I imagine the EGR could be suspect. But the engine purrs sweetly and pulls a strong vacuum, so there are no EGR vacuum leaks. If it passes emissions and the engine runs fine, can I just ignore the maintenance schedule that says to replace the EGR?