How do i bypass the electronic spark control module on 1992 chevy S10 ,2.8

SOURCE: Electronic Control Module Installation 1994 G20 Chevy Van

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.

SOURCE: barely runs , timing retarded , only runs when est bypassed

You have set the timing to zero right? Then after you hook the bypass back up what does the timing go to?

SOURCE: 1989 Chevy K1500, fires but won't start

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

Harvey N Tawatao

• 3854 Answers
• Posted on Oct 10, 2010

SOURCE: I have a 1992 gmc

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 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:

• System in BYPASS mode but the ignition module is still controlling timing
  - or -
• Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec.

SOURCE: no fuel or spark on my 89 chevy k5 blazer

change coil pickup which is in the bottom of the distrubuter