I have been getting a noise during slight acceleration off idle until 2000 rpms. I put in supreme and the noise went away. I listened closer and it still seemed to be making it although only sometimes and very quietly. Today I adjusted the timing in hopes this is the cause. I check it and it was around 6 deg. I put the vehicle in service mode although my check engine light did not flash (1997) the rpm dropped to 4 deg. I set to 3 deg, and will listen for any changes. I do have an obd II scanner that I can hook up to my laptop, is there anyway I can tell the knock sensor is picking anything up by monitoring the readings while I drive?