cdslyde
Newbie
Hello, I am new to this site. I have a 1989 K2500. Stock engine is a 5.7. I replaced the lower end with a 327 that appeared to be built. I had the stock heads rebuilt and cam is stock. Engine light was on before engine swap and don't know the history of that issue. After engine swap I am throwing code 33 and code 43, but only under heavier loads on the freeway. Some things I have already worked on include checking fuel pressure at inlet of throttle body at 11 psi, replaced air valve on throttle body, replaced O2 sensor, replaced tps, replaced distributor with new ignition module, new coil, new map sensor, and new temp sensor.
A couple questions I have are: Does the knock sensor somehow effect the map sensor, or vice versa? Where should I start? Could the lower end with the shorter stroke be causing these issues? I am stumped now so any help would be appreciated.
A couple questions I have are: Does the knock sensor somehow effect the map sensor, or vice versa? Where should I start? Could the lower end with the shorter stroke be causing these issues? I am stumped now so any help would be appreciated.