The Delcos 1000 error code system is primitive but logical. Code 12 means "start here." Code 42 means "replace the ignition module." Code 51 means "clean the chip." By following sensor voltage checks and respecting the ECU's need for perfect grounds, you can keep these classic ECUs running for another decade.
Download the original Delcos 1000 service manual (GM part number 16058136) or consult the community forums at Gearhead-EFI.com , which maintains an active archive of Delco ECU troubleshooting. delcos 1000 error codes
When faced with , a systematic approach saves time and money. Follow this workflow: The Delcos 1000 error code system is primitive but logical