Can anyone help me with a question that I have on an 85 Iroc? It has a Tuned Port 305, rebuilt 20,000 miles ago. It has T-tops, but I don't ever take them out anymore because the exhaust smells. It smelled before the engine was rebuilt as well, but was not the reason for the rebuild. It is choking me out. I just drive it around town. When I do get on the freeway, and am driving at a constant speed for 10-15 minutes, the check engine light comes on. It gives me an EGR error. This is the second EGR valve that I have had in it, and I still get the error. The second EGR was out of an 86 parts car that I had. Could it be another bad EGR, or is there something else that is causing it to run rich? The timing was set by a local tune up shop. When I tried to time it, the timing marks were off by about 90 degrees. Also, the cat seems to have been hollowed out before I got the car. I have planned on replacing it with a high flow. Would that contribute to the problem? Could my fuel pressure be too high or too low? It has the factory non adjustable pressure regulator and a fuel pump that is at least 4 years old. Also, the computer was replaced with a new factory one. It has K&N filters and a flowmaster. Any help is appreciated. I am trying to find the problem without spending every cent I have. My wife won't drive in the Iroc with me anymore, we always have to take her jeep. This is killing me.
Thanks, Will