My MAF is toast, I think..help

[Hye]

I think I ruined my stock MAF. I have another one on the way. My MAF counts just don't look right. Last week (before I screwed with my maf) my MAF counts looked nothing like this, according to my xcal2. whatya guys think?

Time maf v RPM AFR
0.000 1.02 1968 13.3
0.109 0.96 1964 13.3
0.219 1.04 1956 13.2
0.328 1.04 1949 13.4
0.437 1.06 1941 13.5
0.547 0.94 1933 13.7
0.656 0.96 1929 13.9
0.765 0.96 1921 14.0
0.875 1.02 1913 14.0
0.984 0.98 1905 14.1
1.094 1.04 1901 14.2
1.203 1.10 1893 14.3
1.312 1.10 1885 14.5
1.422 0.96 1881 14.7
1.531 0.96 1874 14.8
1.640 1.02 1866 14.8
1.750 1.00 1862 14.6
1.859 0.98 1854 14.4
1.969 1.06 1847 14.0
2.078 1.06 1843 13.7
2.187 0.96 1835 13.4
2.297 0.98 1827 13.2
2.406 0.96 1823 13.3
2.515 0.98 1815 13.4
2.625 0.98 1807 13.6
2.734 0.96 1803 13.8
2.844 1.08 1795 14.0
2.953 1.02 1791 14.1
3.062 1.00 1784 14.1
3.172 1.00 1776 14.3
3.281 1.02 1772 14.4
3.390 0.98 1764 14.5
3.500 0.94 1756 14.5
3.609 0.96 1752 14.6
3.719 1.04 1745 14.6
3.828 1.12 1740 14.6
3.937 1.08 1732 14.6
4.047 0.98 1729 14.5
4.156 1.02 1721 14.4
4.265 0.96 1717 14.3
4.375 0.98 1710 14.2
4.484 1.02 1702 14.1
4.594 1.12 1699 14.1
4.703 1.12 1694 14.1
4.812 1.22 1691 14.1
4.922 1.18 1692 14.0
5.031 1.31 1693 14.0
5.140 1.43 1693 14.0
5.250 1.86 1695 14.1
5.359 2.47 1702 14.4
5.469 3.31 1716 14.8
5.578 4.04 1728 15.5
5.687 4.67 1769 16.2
5.797 4.73 1832 16.0
5.906 4.71 1914 15.1
6.015 4.71 2008 14.3
6.125 4.76 2182 12.7
6.235 4.82 2254 12.0
6.344 4.82 2322 11.6
6.453 4.84 2390 11.4
6.563 4.73 2488 11.3
6.672 4.73 2553 11.4
6.781 4.73 2650 11.4
6.891 4.76 2719 11.3
7.000 4.75 2825 11.3
7.110 4.80 719 18.0
7.219 4.82 3134 11.2
7.329 4.75 3221 11.2
7.438 4.76 3310 11.3
7.547 4.80 3580 11.4
7.657 4.92 3744 11.4
7.766 4.92 3831 11.5
7.876 4.80 3923 11.5
7.985 4.78 3986 11.5
8.094 4.84 4065 11.5
8.204 4.78 5966 10.0
8.313 4.80 4204 11.5
8.423 4.78 885 16.8
8.532 4.88 4282 11.4
8.641 4.86 4338 11.3
8.751 4.78 4404 11.2
8.860 4.80 4485 11.1
8.969 4.80 4544 11.1
9.079 4.82 4593 11.1
9.188 4.86 4644 11.0
9.298 4.88 4708 11.0
9.407 4.88 4755 11.0
9.516 4.94 4819 11.1
9.626 4.88 3987 14.3
9.735 4.82 507 14.3
9.844 4.84 5024 11.2
9.954 4.86 5115 11.2
10.063 4.82 519 18.0
10.173 4.84 5267 11.1
10.282 4.86 5333 11.1
10.391 4.90 437 18.0
10.501 4.96 5488 11.2
10.610 4.82 5578 11.5
10.719 4.84 1439 10.0
10.829 4.88 5661 12.0
10.938 4.84 5722 12.2
11.047 4.86 5816 12.3
11.157 4.92 1541 0 0
11.266 4.92 5939 12.2
11.375 4.94 5961 12.2
11.485 4.84 532 18.0
11.595 4.84 6128 12.6
11.704 4.84 6176 12.7
11.813 4.88 6217 12.7
11.923 4.90 6382 12.7
12.033 4.98 6427 12.7
12.142 4.88 613 18.0
12.252 1.10 6524 12.8
12.361 1.08 6416 12.5
12.470 1.06 6325 12.7
12.580 1.04 6354 12.9
12.689 1.02 6328 13.1
12.798 1.02 6294 13.4
12.908 1.16 6255 14.1
13.017 1.12 6226 15.0
13.127 1.14 6182 17.8
13.236 1.08 6139 18.0
13.345 1.04 6098 18.0
13.455 1.04 6047 18.0
13.564 1.06 6003 18.0
13.673 1.02 5950 18.0
13.783 1.08 5905 18.0
13.892 1.00 5859 18.0
14.002 1.14 5804 18.0
14.111 1.12 5758 18.0
14.220 1.08 5710 18.0
14.330 1.02 5664 18.0


the funny part is, no check engine light, no suging, a little bog/hesitation issue but nothing major. No eratic idle, nothing out of the blue that would lead me believe the maf was bad. Ask me if you want to know how i ruined the maf.

 

[djtyau]

I don't know how long it is going to take to get your MAF, but if you want we can hook up over the weekend and we can pull my stock MAF and try it on your car. :shrug:

PM if you want to try it.

 

[ShelbyGuy]

maf counts / 250 == maf_v.

thats a wideband commander datalog of maf_v. the maf sensor has a 0-5v signal.

your maf is pegging too. its reading 4.98 volts.

 

[TEABG]

Stop driving your car and take it to an experienced tuner A.S.A.P

 

[TEABG]

YOUR A/F ratio holy crap....................

 

[Hye]

im pretty sure i ruined my maf.

something about an air compressor/ cleaning out my intake tube with the maf still on the tube leads me to believe that i really screwed up the wires/sensors there. i have another maf on order. im not driving the car hard, and when i do im out of boost, i'll get it fixed asap, i'm sure it's just the maf, atleast i hope.

 

[ShelbyGuy]

you think that because the wideband commander and the xcal2 dont agree that you have a problem? they're reading two different things. the xcal2 is reading the obd2 tag "maf counts" while the wideband commander is reading the voltage signal from the sensor itself. those are two different things.

maf counts / 250 == maf_v. when you do the math, does it come out right?

given the fact that the maf sensor actually pegs, i'd say your problem is the tune not the maf sensor.

 

[Hye]

you think that because the wideband commander and the xcal2 dont agree that you have a problem? they're reading two different things. the xcal2 is reading the obd2 tag "maf counts" while the wideband commander is reading the voltage signal from the sensor itself. those are two different things.

maf counts / 250 == maf_v. when you do the math, does it come out right?

given the fact that the maf sensor actually pegs, i'd say your problem is the tune not the maf sensor.

no it doesnt come out right

STFT STFT MAFAD counts RPM's
68.24517 0.9955444 0.9963989 368 4986.5
68.24517 0.9955444 0.9963989 369 4986.5
68.25005 0.9955444 0.9963989 369 4986.5

this is a log that is in excel, i just cut a little tidbit out. this log was taken before I did any modifications to my JLT Intake with my maf still on, about 1 week ago. The maf counts at 4986.5 rpms are 368. 368/250= 1.472 maf V.

Now if you look at the maf v on this post here, at 4800 rpm's the maf voltage is 4.83. Yikes, something tells me it's not the tune, and it's my dumbass that ruined my maf when i shot an air compressor through the maf/intake.

Just for reference sakes, though I dont *think* it should matter, my Excel log (the one with the maf AD counts) was tested during part throttle. The log posted up in this post here (MAF V) is done at WOT, again I dont think that matters though

Whatya think John?

 

[Hye]

Stop driving your car and take it to an experienced tuner A.S.A.P

eh, your not reading the graph carefully enough.

From 5700rpm's to 6500 rpm's I run lean. It's odd that I have never ran lean before, not have I pegged my maf until I chose to clean my MAF with an air compressor.

The 18.0 a/f you are looking at is with no gas pedal, i.e. coasting, off the dyno run...in which your a/f should be lean.

Ed sent me another tune to richen up from 5k rpm's and up, but honestly before I install it, I'm going to install another maf and see if that fixes the problem, which I believe it will.

The car did not have a pegged maf, nor did It have a lean a/f at the upper rpm's before I F**** with my MAF.

 

[Hye]

Darn, disregard post #8 as it DOES matter whether or not the maf counts/voltage are seeing Wide Open Throttle or Part Throttle

I just got off the phone with Ed.

My maf counts according to my xcal2 look GREAT.
my maf voltage according to my wbc looks poop

which leads me to believe that I either have an issue with the maf itself, or my maf v on my wbc is not set up properly.

when i get my new maf in, i'm going to log maf counts with the xcal and maf voltage with the wbc and see who's telling the truth...