Code 42 is the ignition module faulty or loose connections.
Code 42 on a 1992 Chevrolet Caprice typically indicates a problem with the Electronic Spark Control (ESC) system. This code often means there is a malfunction in the ESC module or a related component, which can affect engine performance and fuel efficiency. It’s advisable to check the ESC connections and wiring, as well as the module itself, to diagnose and resolve the issue.
You clear code 42 just as you clear any other code. Disconnect the battery cable from the battery for 30 seconds, then reconnect. (It's good practice to disconnect the battery cable whenever disconnecting or changing any electrical components.) Afterwards, check the "check engine light" to see if the code 42 is cleared. This answer applies only to '95 and older models (OBD-1).
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1993 Grand Am 3.3L V6 (6-204) - Solved intermittent "Code 42 - electronic spark timing" issue by replacing Mass Air Flow sensor, after checking all wires in harness (and replacing some) between the ECM and ICM, check all connections, and replacing all the other sensors. All work prior to replacing MAF improved performance but did solve intermittent Code 42 problem. Never got a MAF sensor Code 34.
John and Leeza from Hollywood - 1993 1-42 was released on: USA: 10 August 1993
Bonkers - 1993 Cartoon Cornered 1-42 was released on: USA: 29 October 1993
42-42-564
42 IS THE ANWSER
1993 Grand Am 3.3L V6 (6-204) - Solved intermittent "Code 42 - electronic spark timing" issue by replacing Mass Air Flow sensor, after checking all wires in harness (and replacing some) between the ECM and ICM, checking all connections, and replacing all the other sensors. All work prior to replacing MAF sensor improved performance but did NOT solve intermittent Code 42 problem. Never got a "MAF sensor" Code 34.
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Code 42 on a 1994 Chevrolet C2500 typically indicates a problem with the vehicle's electronic control module (ECM) or the vehicle's security system. To fix this, first check the connections and wiring to the ECM for any signs of damage or corrosion. If the connections are fine, you may need to reset the ECM by disconnecting the battery for a few minutes and then reconnecting it. If the code persists, consider having the ECM tested or replaced, as it may be malfunctioning.
There is a problem in the Electronic Spark Timing System. 1993 3.3L V6 (6-204) - Solved intermittent "Code 42 - electronic spark timing" issue by replacing Mass Air Flow sensor, after checking all wires in harness (and replacing some) between the ECM and ICM, checking all connections, and replacing all the other sensors. All work prior to replacing MAF sensor improved performance but did NOT solve intermittent Code 42 problem. Never got a "MAF sensor" Code 34.