1989 GMC K1500 "code 42 bypass electric spark" Questions

...code 42 {electronic spark timing or cicuit failure) I have changed dist cap wires, plugs and rotor button, but still is missing and engine light comes on code 42, what do you think problem is? Hey, ...

...code on a 1995 chevy suburban it is a 42, 96 on up use a OBD-II system to read codes. older than 96 use an OBD-I system to read codes. 42 means - electronic spark timing or bypass fault. this means ...

code 42. electronic spark tining. E S T circiut fault. Cleared codes and installed a fuel pressure gauge. On test drive the motor, (3.1 EFI) still stalls and dies. Fuel pressure is 38 to 42. No logged

...code? CODE 42 Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module while the ECM ...

...code list: 13 oxygen sensor circuit 14 coolant temp sensor circuit (high temp) 15 coolant temp sensor circuit (low temp) 21 throttle position sensor (TPS) circuit (high signal) 22 throttle position ...

...Code 42 4 flashes, pause, 2 flashes The Electronic Spark Timing (EST) signal did not change when the ECM applied bypass voltage to the ignition module. Check for faulty connections, or a faulty ...