OK, I'm getting my car ready for summer driving. 1991 z28 5.7 tpi 700r4. I replaced the fuel pressure regulator (adjustable now), EGR valve, and coolant hoses this winter. Today I took her out for a cruise after a 20 minute warm-up. And at about 3 miles of highway driving (65 mph) the SES light came on. The car seemed to be running great at the time. I took it home and read the codes and came up with code 12,speed reference pulse, and code 32 EGR failure. What did I do wrong, and how do I fix it? You people have helped me more than you could know in the past and I would really appreciate it now. Thank's Randy Almost forgot, fuel pressure at the regulator drops to 0 in lrss than a minute, no leaks or fuel smells that I can sense.

 

is it possible that either your EGR stovepipe(s) or the passage into the intake is plugged with carbon? if so, that could do it.

 

I was hoping that wasn't the answer but it probably is. Thanks for the help! I still don't understand the code 12 though.

 

code 12 is what flashes to let you know the ECM is working and sending out a flash pattern for the trouble codes.

 

WE HAVE THE SAME CAR AND HAD THE EGR CODE THE OTHER DAY THE ONLY THING WRONG WAS THE VACCUM HARNESS HAD CAME LOOSE.

 

thank's for the help, I followed your advice and I think I got it right now, randy