Hello, I have a 88 LB9. I have been battling a intermittent code 34. Last night I installed two new relays to rule them out. Mass air and the burn off relays. This morning when I went to fire up the car the cooling fan came on, before I even cranked the car over it was on? When I started the car my check engine light didn't come on, I think my code 34 could have been a relay issue because it would always come on when the engine was cold and off during hot restarts. think the relays may have fixed it, but why would the fans all of a sudden turn on when I put the ignition in the run position, it's like forty degrees here in new york?

 

Fan with key on usually means car in in limp home mode.
Memcal not seated in ECM ,faulty memcal ,etc

https://www.thirdgen.org/forums/post...665-post1.html

 

Thank you, I am getting my cable to hook my car up to my laptop with tunerpro tomorrow, hopefully having a scan tool will help shed some light as what is going on. Thanks a lot for the info.