1990 Chevy Silverado ECU and ingnition mod

1990 CHEVROLET SILVERADO
Avatar
JOHN DAWSON
  • MEMBER
  • 1 POST
Engine Performance problem
1990 Chevy Silverado V8 Four Wheel Drive 240000 miles

Truck idles fine with EST disconected timed at 0 Hook up ECM and it misfires,lopes and dies Ecm showes code 42 so I replaced ignition module and pick-up coil No change so I replaced ECM No change Showing code 42 on new ECM
Feb 22, 2010 at 2:10 PM
Advertisement
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.