C
cwmartin59
Guest
I own a 1986 Late Model Year (Aluminum Heads) Coupe. Car runs great. When I am driving 65 or higher (smile) for any time (with or without cruise) the Service Engine Soon light comes on. Driving under 65 the light does not come on. I have read out the codes and indications are the EGR system. I have replaced the valve (a lot of work) and the same thing occurs. The EGR switch seems to be working properly. Vacuum lines are good. I have had the car at the Chevy dealer and they couldn't find anything wrong. I am the third owner of the car. I have discovered that the tube that runs from the air pump switch (right front) to the exhaust system (Catalytic Converter) is missing and the remaining hose is not plugged. The exhaust system had been replaced by a previous owner. Other than the annoyance of the light, everything seems to work fine. Any ideas...Thanks in advance. :cool