EGR valve replacement and carbon removal

Had a scan and get report of EGR system problem. Been told this like two times in 2-3 years with intermittent CEL light.  About carbon, no carbon on the new valve, naturally  what is the place to worry about carbon on, in  the system when and after getting the old one off. Read things still have to wonder were this carbon would be and what to do about it. Going to replace the control solenoid as well, managed to get AC Delco parts. Seems simple enough to remove and replace both of them but would like to understand the possible carbon issues I see written about from time to time. And what is done about it beside scrape it away if I see some. Were would it be if I have it Any input would be very helpful.  1994 LT1  152,000 on machine. BTW runs perfect at all times CEL on or not code was # 32, lamp always goes away after restart only pattern I have seen is comes on approaching a stop, or going rater slow and about to stop, as weird as that sounds. Been on 5-8 more times or more no pattern no time frame. All hoses look like new, and are in place and no cracks or any of that. I feel it is more a solenoid problem , but have not tried to see if it will hold a vacuum considering age and miles I do not mind replacing it either way.
Just do not understand the carbon things I read unless it is in the valve and not letting it close sometimes.

If the car has been driven aound town all its life,. i might worry about the egr passage plugged,. but its unusual,.

I,d guess the egr vacuum diaphram is probably nich gut.

On a TBI, with no code recorded but the CEL on occasionally at highway cruise, is this a potential EGR valve too? The OP reminded me I was having a similar problem. Car runs great no matter what, just like he said.

phantom 309 wrote:

If the car has been driven aound town all its life,. i might worry about the egr passage plugged,. but its unusual,.

I,d guess the egr vacuum diaphram is probably nich gut.

I found no carbon the diaphram was for sure bad, glad I got away with the install with out dropping a nut. easy to do actually, I found the solenoid install was touchy with out loosing the nut but I got away with it, cleared codes will see what happens, a true finger tip job will wait to see what happens EGR for sure was defective diaphram.

r67northern wrote:

On a TBI, with no code recorded but the CEL on occasionally at highway cruise, is this a potential EGR valve too?  The OP reminded me I was having a similar problem. Car runs great no matter what, just like he said.

Would be better to start a new thread,. and paper clip your car and post the codes