My car has had a small miss since I got it and over the last couple years have change many parts, some for this reason, some for other reasons. The miss is still there, I just setup and made a couple datamaster runs since this is my first experience with scan tools I am trying to figure out which values are good and which could be problems. For example at idle I noticed that a few of the readings are jumping all over the place, O2 volts is from 85 to 900 mv, spark advance is from 15 to 25, which seem to strange to me since the car is at idle. Does anyone have a good datamaster file that I can look at to compare to mine. The car is a 91 auto it has about 45k on it, it is pretty much stock. Please let me know if you any other info.
Thanks.
My car has had a small miss since I got it and over the last couple years have change many parts, some for this reason, some for other reasons. The miss is still there, I just setup and made a couple datamaster runs since this is my first experience with scan tools I am trying to figure out which values are good and which could be problems. For example at idle I noticed that a few of the readings are jumping all over the place, O2 volts is from 85 to 900 mv, spark advance is from 15 to 25, which seem to strange to me since the car is at idle. Does anyone have a good datamaster file that I can look at to compare to mine. The car is a 91 auto it has about 45k on it, it is pretty much stock. Please let me know if you any other info.
Thanks.
It is normal for the o2 voltage to fluctuate from low to high. This means that the sensor is working properly and that the ECM can know that it can go to closed loop. At idle I don't think that your timing should be bouncing around that much. If you want you can email me your datalog file and I can take a peek at it.
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Datamaster Results ?
