1998 Chevy Metro 2 fuel injectors not firing

1998 CHEVROLET METRO
Avatar
METRODRIVER
  • MEMBER
  • 1 POST
Computer problem
1998 Chevy Metro 4 cyl Front Wheel Drive Automatic

Fuel injectors 1 and 3 are not getting a trigger pulse from the ECU. 2 and 4 trigger fine. Got a used "good" ECU and it had the EXACT same symptom. Can't be the ECU right?!
1 and 3 can be triggered manually with a back probing jumper to ground from the respective pins in the ECU, which verifies the wire and injectors work fine.

What else could cause this symptom other than an ECU with 2 bad injector drivers? Having a hard time believing I have 2 bad ECUs!
Apr 10, 2010 at 3:23 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
If it has a camshaft sensor could be it -being use to synchronize the injectors
Apr 12, 2010 at 6:01 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.