Don't understand this,i just can't get a trace to show up at all on my oscilloscope,tailpipe traces etc fine,it's just in-cylinder??There isn't even a flat line trace showing on screen when im setup and ready to start the car?Anyone any ideas?Thanks,Lee.
I assume you are using your WPS for tail pipe pulsation measurements?
Could you confirm your WPS runs through each range when powered up?
It should cycle from range 1 through to 3 and then back to 1. During this period could you confirm the measurement port is open to atmosphere (This is your zero calibration for each range)