Need help with a code 42 on a 91 Surburban
Thread Starter
CF Beginner
Joined: Mar 2021
Posts: 2
Likes: 0
Need help with a code 42 on a 91 Surburban
Need help code 42 1991 Surburban R1500 5.7
I did a tune up and crossed a couple wires and moved it out of time. When fixing the issues I was setting the timing and unplugged,one at a time, the 2 sets of wires coming out of the back of the distributor when I couldn’t find the black tan one. I found the tan and black later when adjusting. Afterwards I got a code 42. I replaced the distributor and timed it and still have the code 42. It runs strong but smells ritch and isn’t 100% like before. How do I fix? Thanks
I did a tune up and crossed a couple wires and moved it out of time. When fixing the issues I was setting the timing and unplugged,one at a time, the 2 sets of wires coming out of the back of the distributor when I couldn’t find the black tan one. I found the tan and black later when adjusting. Afterwards I got a code 42. I replaced the distributor and timed it and still have the code 42. It runs strong but smells ritch and isn’t 100% like before. How do I fix? Thanks
CF Beginner
Joined: Nov 2019
Posts: 18
Likes: 0
This is what I found
Maybe double check those wires again
ODE 42 - Electronic Spark Timing or Bypass Fault
ODE 42 - Electronic Spark Timing or Bypass Fault
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.
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.
Thread
Thread Starter
Forum
Replies
Last Post