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Discussion Starter · #1 ·
Fuel trim example of somewhat high at idle but normal under driving conditions. In this case, car drives fine but this shows you can have signs of a vacuum leak but still run fine.
In the chart, '03 DOHC cold weather, cold start and local driving then interstate on cruise, then coast and idle at stop light. Then to parking lot.
Hope this gives a glimpse of what goes on, and signs of trouble to come before the light comes on. No idea of how high the positive trims have to be to trigger a light. Although I feel the car runs fine, there has to be some less then perfect performance when not under load.
When the weather gets warmer, I will try to find the leak and fix it. Then rerun this trip. Both banks same chart.
Just sharing.
Any comments welcome and please chime in.
-chart-
 

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Discussion Starter · #4 ·
Hey Chart, what do you use to get your data? Like what program?
"Carchlip" as in the pic. I have had this for lots of years. Pic of a cut of some of the information it records along with lots of stuff.
Also use "FastStone Capture" to copy parts of displays, and resize pics along with "Draw" function.
-chart-
 

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