E46Fanatics - View Single Post - CEL light on....SAP bad and other engine performance problems
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Old 01-22-2013, 06:52 PM   #18
OEM ///Member
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 23,183
My Ride: 330CiC, M5, X5, E93
If your tool is actually reading your MAF in Grams/Sec, then I believe your MAF is a cheap imitation? I do not think it is just bad, the values are off too far even for a bad MAF?

I just took my 330 out and at idle my reading is about 7 Grams/Sec
At 3k RPM no load free rev my reading is about 14 Gram/Sec
I jumped on the throttle not too hard coming off a stop and I do not think the engine ever went over 3k RPM and I was pulling up to 60 Grams/Sec before getting out of 2nd gear.

Note my current outside temp is 18F so I would assume I have a bit more density in the air than warmer air, but I would not expect these valves to be off significantly.
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 01-22-2013 at 06:53 PM.
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