I have a 1993 Civic Si that has been in limp mode ever since it overheated a few months ago. I just recently learned about this mode and it explains why the car can't rev above 3500 rpm. I was following instructions on how to reset the ECU to bring it out of limp mode so I could test v-tec, I unplugged the battery and ECU and I put them back together, now it won't start. It had been having trouble starting before and would take a few tries to start up.

When I turn the key I hear a whirring of fans, the lights on the dash light up but there is no sound coming from the starter. No trying to turn over, just silence.

So today I read up on the problem, heard that it was probably an issue with the starter solenoid because if the starter wasn't working the solenoid would still make a clicking sound (which it isn't making). So I go to AutoZone and pay $80 for a new solenoid, spend an hour and a half trying to put it in, and when everything was put back in its place... Same issue, no sound, doesn't start.

Please help