I just got a new clutch put in 2000 ZR2 Blazer it had 113,000 miles on the old clutch, and the day I went to pick it up on a Friday, it wouldn't start. So we left it there. Later the mechanic called and said that he just left it set for a couple of hours and it started just fine. We figured okay. On Saturday we went and picked it up and i probably put about 30 miles on it and then my Service Engine Soon light came on. A week later it wouldn't start again after an hour of trying to start it, it started. It had sounded like there was no gas in fuel lines. I just went to Auto Zoneto get the it checked and the code came up P0146- Oxygen Sensor#3. Could this be from the new clutch??or Could it bethe start of some thing going wrong the fuel pump??I tried unplugging the battery to reset the system, in fear that I over rev'd it, and the light still is on.

 

The mechanic may have forgotten to reconnect one of the O2 sensor wires. Call em up and have them come get it or if it starts drive it back and have them look. Takes only a couple of minutes to reconnect the wires. They just snap together.

 

A B1S3 code will not cause a no-start condition. There is more at work here.