OBD II Analysis? Live Data...

[Dan Mumford]

Hey guys, is anyone able to understand/analyse OBD II data?

I've replaced the MAF sensor in my car and it seems to be performing a lot better than before, but I'm still getting a check engine light in the dash (but no fault codes) and there still seems to be a slight idle problem...

And to my completely non mechanic trained mind, it seems to smell quite fuely/petroly (technical term lol)

Fuel system 1 status --- OL-Drive
Fuel system 2 status --- CL
Calculated LOAD Value --- 0.8%
Engine Coolant Temperature --- 87C
Short Term Fuel Trim - Bank 1 --- 0.0%
Long Term Fuel Trim - Bank 1 --- 32.0%
Short Term Fuel Trim - Bank 2 --- 0.0%
Long Term Fuel Trim - Bank 2 --- 32.0%
Engine RPM --- 904/min
Vehicle Speed --- 0mph
Ignition Timing Advance for #1 Cylinder --- 4.0
Intake Air Temperature --- 50C
Air Flow Rate from Mass Air Flow Sensor --- 0.4lb/min
Absolute Throttle Position --- 0.0%
Commanded Secondary Air Status --- OFF
Oxygen Sensor Output Voltage (B1-S1) --- 0.060V
Short Term Fuel Trim (B1-S1) --- 0.0%
Oxygen Sensor Output Voltage (B1-S2) --- 0.435V
Short Term Fuel Trim (B1-S2) --- 99.2%
Oxygen Sensor Output Voltage (B2-S1) --- 0.245V
Short Term Fuel Trim (B2-S1) --- 0.0%
Oxygen Sensor Output Voltage (B2-S2) --- 0.435V
Short Term Fuel Trim (B2-S2) --- 99.2%

Any ideas?

Thanks! ����

[oldskool73]

Your long term fuel trims are way out of wack, they should be no more than about +/-10. Mine were up around 27 and replacing the MAF fixed mine.

If you've not already, you might want to try disconnecting the battery for a while so the old LTFT is lost, then taking it out on a decent length trip. The LTFT won't start to adjust until it's warmed up, but may then come down to a normal range.

If not, you've got something else wrong ... https://www.autoserviceprofessional.com/article/94982/Fuel-trim-How-it-works-and-how-to-make-it-work-for-you?Page=2

[BYprodriver]

Clogged, dripping fuel injectors ? Add a bottle of techron additive while filling tank with Chevron Supreme. Hit the highway & maintain 3000+ rpm as long as you can.

[Dan Mumford]

So I reset the ECU as suggested and then took the car for another drive, these are the live data results afterwards, the fuel trims seem to have adjusted a little bit but the bank 2 sensor 2 still seems high...