Katzmans Caddy
Posts: 1268
Joined: 12/3/2006
Status: offline
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You need the manual as Dave S Texas suggests. Your car is 20 years old now and I don't know those error codes like I know the OBD II codes used now BUT the EGR code is a typically carbon build up or valve failure. A new EGR (Exhaust Gas Recirculation) valve is not that big a deal to replace and not expensive but the manual will show you how. Carbon build up in the EGR passages is a bit of a problem but there are top cleaners to do the job. The ones from the GM dealer are probably best but sometimes they won't sell this stuff to the guy on the street because of safety regs., it's nasty chemicals is all. Sometimes you need to remove the intake manifold and manually clean the passages.
Not to bore anyone but the EGR system takes exhaust gases and recirculates them into the intake to be reburned. The EGR valve controls this. The engine is set up for an air fuel charge with these exhaust gases in it and if the system isn't working right it can make the engine stumble, idle badly and run hot. I don't know teh 4.1 system but usually there are pipes or pasages that return the exhaust gases to the intake manifold. These are the things that can get blocked with carbon. The shop manual will show it all.
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RE: performace parts for a 1987 cadillac deville - 
