Recently, the Engine has been running rough and a code generates and the Engine light comes on telling to shift in lower gear.
I replaced Spark Plugs, tested Fuel Pressure and Injectors.
Using a scanner, I was able to get live data values.
FuelSys1 - shows OL-Fault (never changed out of open loop)
Short Term Fuel Trims shows 0% with no variation
Long Term shows 0% with -0.8% at times.
MAP shows 64.0 at 907 rpms
MAF shows 10.0 to 12.0 range
Spark Adv show 22.0 to 23.0 range
02 sensor data more difficult to label but I do have a video showing the values.
O2 sensors
What makes this problem better or worse?
P0300 - Engine Runs Rough
How long has your 2007 Volvo S40 had this problem?
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