I ran it 2 times for about 30 seconds when winaldl was hooked up. I reved it all the way up a few times. I was using a desktop computer so I couldnt really drive around.

Do I need to be running it longer to get an accurate reading?

 

It depends on what you want to do. WinALDL ( and other scanners ) log data as it happens. If you have some engine problems during part throttle acceleration at 40 MPH in a downslope turning left, then you have to record data when doing that.

You can check errorcodes and sensors using a desktop computer in the garage.