What is code 42 on OBD1?
Ignition Bypass Circuit Error The ECM monitors the Ignition Bypass circuit and will set code 42 to signal an error. The ignition bypass circuit allows the ECM to switch the ignition module from “base” timing to computer-controlled timing advance.
What is electronic spark timing?
The spark-Optimizer is a closed-loop type electronic control device that continuously corrects the ignition timing; in effect it re-tunes the engine some ten times every second.
What does a Electronic Spark Control Module do?
The Electronic Spark Control, also called the Knock Sensor, is an electronic device built by General Motors to help regulate the timing inside of the engine. When combustion inside the engine does not fire properly, a “spark knock” or abnormal vibration can occur.
What does error code 42 mean on the Chevy Silverado?
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 monitors the engine speed.
What is the firing order for the 87 S10 V6?
What is the firing order for the 87 s10 v6? Asked by Lee Sep 10, at PM about the Chevrolet S the engine it goes 1,2,3,4,5,6 and the lone wire goes in the middle just make sure you follow your wires to the right . What is the firing order for the 87 s10 v6?
What are the diagnostic aids for a code 42?
EST line open or grounded. By-pass line open or grounded. Diagnostic Aids: The scantool does not have any ability to help diagnose a Code 42 problem. A PROM not fully seated in the ECM can result in a Code 42. Diagnostics:
Where does the lone wire go on a Chevy S10 engine?
Asked by Lee Sep 10, at PM about the Chevrolet S the engine it goes 1,2,3,4,5,6 and the lone wire goes in the middle just make sure you follow your wires to the right . What is the firing order for the 87 s10 v6?