Alright the car has been getting 200 miles per tank while driving light, this is combined city and highway driving. I have no internal upgrades or anything that should be hogging more gas. I let the car get to its operating temp and wrote down all the results from the scanner :

Baro (HG) - 28.15
LT Fuel Trim - ON
LT Fuel Tr CL - 5
LT Fuel Trm L - 115
LT Fuel Trm R - 116
CC on/off sw - OFF
EVAP DUTY - 0%
EGR DUTY - 0%
Coolant - 185* (this is the hottest the car gets)
IAC Position - 29
Inj L PW - 0 MV
Inj R Pw - 0 MV
ST Fuel Trim L - 124
ST Fuel Trim R - 124
Knock Ret - 0*
Knock Sensor - 20
Loop - Closed
MAF (GR/SEC) - 8
MAP - 1.27 V
IAT (F*) - -40
O2 Right - 100-900 MV
O2 Left - 100-900 MV
Spark Advance - 19*
TPS - 0.65 V

Can anyone see something wrong here? It's been like this over a year now, A4 3.23 gears, Ram air, MAC headers, Hooker-Catback, Air foil, TB Bypass have been done. Thanks for any help!

 

The first problem I see is that for whatever reason you're not getting any pulse width readings(Inj L PW - 0 MV Inj R Pw - 0 MV). What type of scanner are you using?

 

Actron

 

Looking at a single "frame" from a scanner doesn't tell you too much. As noted in the post above, while most of the data looks "normal", some of it makes no sense at all. Appears you are at idle, but looks like it may be in Cell 5. It should be in Cell 16 it idle. And, even though you show 8 grams/sec of air flow, the "0" injector pulse widths are obviously incorrect.

Everything else looks OK. One question... what is your elevation above sea level, just to check if the "barometer" value is logical? Looks like you might be at about 1,000-ft (not in Boston ), or there was a low barometric pressure in Boston?

 

Weather.com tells me the baro press. in Boston right now is 29.959

 

The car was at idle...why wouldn't the pulse width be showing up? I don't know anyone else with a scanner and I'm not paying GM $80 to tell me nothing I don't know already.

 

I don't know why the pulse width wouldn't show up. Maybe try scanning again?

Like Injuneer said though, at idle the cell should be 16. Your longterm fuel trims do seem to be a bit rich 115/116 as compared to 128(currently mine are about 108-113...lol).

Have you modified the MAF in any way? Ported, descreened, etc?

Mine is descreened, and I've noticed it running rich for a while now. If I unplug the MAF the BLM's jump right back to 128. Plug the MAF back in and they drop down to 108-113. Definitely not something right there.

 

MAF is stock with the screen still in it. It does have an aftermarket fuel pressure regulator from the previous owner but when I tested the fuel pressure it was normal with 40 psi at idle.