I have a 1995 Z28, manual transmission that just started showing the service engine soon lite just before the engine cooling fan comes on. How can I determine what the problem is and how to fix it? Thanks for any suggestions.

 

Step 1 scan for codes.
Step 2 post in the lt1 engine tech forum, imo you are more likely to get a good response for this issue in that forum.

 

Moved.