Question about 1992 Chevrolet S-10
Locate the tan wire with black stripe under the dash on the passenger side it should be taped to the harness unplug the inline connector and esc will be disabled for setting the timing
Posted on Nov 28, 2014
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Posted on Jan 02, 2017
I just had the same problem. If it is a regular van try under the driver seat in a plastic box. If it is a conversion van try in a pannel just behind driver seat on side of van wall behind a pannel that looks like a vent.
Posted on Apr 09, 2009
removed the dis cap then try to rotate the belt thuse turning belt see if there is any slack when rotor turns if there is slack or even slight hesitation while turning u need a timing chain & gear
Posted on Aug 16, 2009
SOURCE: I have a 1992 gmc
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. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control. The ECM calculates what the timing should be then "tells" the ignition module via the EST circuit.
An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.
The conditions for setting this code are:
- or -
Typical causes for this code include:
1) BYPASS line is open or grounded
2) EST line is open or grounded
3) PROM or CALPACK not seated properly in the ECM
4) Poor connections between ignition module and ECM
5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
6) Faulty or incorrect ignition module
7) Faulty ECM
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Posted on Oct 10, 2010
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