[SOLVED] Cylinder 1 Misfire - P0301 / P0300 Mystery

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Originally Posted by Toothbrush

Since it's too cold to do anything, been trying to learn more about fuel trims and 02 sensor data. As I (currently) understand it, since sensor 1 & 2 are wideband, then 0.0 mA = stoichiometric. Positive number means going lean, negative means going rich.

Looking at the numbers from a Carly Gen2 adapter + OBD Fusion (pro), looks like Bank 1 is much leaner than Bank 2. I measured 900 pts (changes in reported values) and compared them, along with RMP and saw the following:

Average Bank 1 - .505mA
Average Bank 2 - .163mA

Average difference between the two over that time = 434%

This appears to be more evidence of unmetered air/vacuum leak... ? Sprayed Carb cleaner around Cylinder 1 fuel injector and intake while watching RPMs, didn't notice any changes.

I really thought this would point you at the issue....

Can you run a Vanos Function test??