hey guys, got my car scanned today, pulled codes 32 and 43, engine has 88k miles on it, its a 94 z28, do i need new knock sensor for starters? i think thats what code 43 is, any ideas of common problems for code 32? thanks guys!

 

32- Exhaust Gas Recirculation (EGR)
43- Knock Sensor Circuit

 

so whats the most common remedy for these problems? do i need a new knock sensor module? can i use a LT4 one? thanks

 

DTC 43 indicates the PCM is not seeing the correct voltage/resistance in the knock sensor circuit. We are only talking about the knock sensor.... this has nothing to do with the knock module. Either the wiring is faulty or the sensor is faulty. Key on, pull the single wire off the knock sensor and measure the voltage between the wire and engine block ground. Should read +5V. With the wire still off, connect an ohm meter between the single pin on the knock sensor and the block. Should read about 4,400ohms. Put the wire back on the sensor, probe between the wire and ground, should read about 2.5V. If you don't have the voltage in the wire, its a wiring problem. If you don't have the correct resistance in the sensor, its a sensor problem.

DTC 32 indicates the PCM is not detecting any EGR flow when it tells the EGR valve to open. This is a really unusual code to get in an OBD-I car, since the diagnostic is not very sensitive. For some reason the EGR valve is not opening, or if it is opening, there isn't any flow (plugged with carbon). Take the valve off and clean it and the back of the intake manifold where it bolts up.