Need help

2013 Volvo S60 T5 2.5l. Random misfires. Sometimes at startup and sometimes after driving for a while. Im post a pic of the data. The first section is at idle and the change is when im driving. 

Was this running the whole time ? If it was I would look at the injectors and get waveforms from each cylinder.

No. It was idling at the begining. The change is when i took it out for a drive. Another thing.. Should the upstream sensor stay around .97 to 1.08 and at 1 with the engine off.

If key was in on position or if engine was at operating temp it will generate its own voltage signal for a bit. Since car was shut off for a few seconds? It looked like it dropped to 0 after a bit of time. Correct?

No. It stays at 1. Even with the sensor removed it still shows 1

Must be bias voltage

wrote:

No. It stays at 1. Even with the sensor removed it still shows 1

Can you send me that data capture and/or the picture you posted? wrenchturnsyou@gmail.com. Which scan tool are you using?

The 1.00 reading you're seeing from the front O2 is very likely Lambda or Equivalence Ratio. Pretty sure it's Lambda? But not 100%. Anyway, Volvo was an early adopter of wideband sensors, and are typically represented by EQR or Lambda in the scan data. .93 to 1.08 sounds pretty typical.

Actual voltage values at the sensor are quite different from what you're seeing on the scan data.

Your right about the sensor.the scan tool im using is the thinkdiag one. The data from this picture im posting is while im driving. I get multiple random misfires on all cylinders. Siometimes at startup and sometimes after driving for a while and sometimes there wont be any.

If you have a video scope stick it down the intake and look for carbon build up. Then check injector waveforms and do a pressure drop test with each injector. Followed by some swaptronics of moving coils around to see if it follows

Dont have the tools to do that.