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Old 05-30-2006, 12:32 PM   #1
baldchicken
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Default Low MAF voltage?

After getting my log semi-working... When reviewing my log and everyone elses log... it is showing my voltage of MAF at like 3.1 - 3.3 and everyone else's log is abotu 4.1-4.5 volts. I am having issues with my check engine light flashing around 3k-4300 RPM. I dont think its a ping because I can lug my car up-hill and no check engine light flash, but when I go WOT, the log says its burning rich and seems to advance the timing and not retard it... can low MAF voltage cause this..... here is a quick look at the log.
Code:
3058, +2.3,3.1, 79, 20,   00,  rich,+28.3,  24.3,+25.2, +1.1,369.00,2.9
 3066, +3.5,3.1, 92, 30,   00,  rich,+26.2,  25.3,+24.4, +1.4,WGS.  ,2.9
 3095, +4.9,3.2,101, 40,   00,  rich,+23.7,  28.2,+23.0, +2.2,WGS.  ,3.0
 3121, +6.4,3.2,101, 40,   00,  rich,+21.4,  30.2,+21.5, +2.2,410.00,3.0
 3109, +7.6,3.3,101, 50,   00,  rich,+15.5,  32.5,+20.9, +2.4,410.00,3.1
 3147, +8.8,3.4,101, 50,   00,  rich,+15.2,  35.1,+20.6, +2.4,410.00,3.2
 3147,+10.2,3.5,101, 60,   01,  rich,+14.4,  39.1,+10.3, +2.5,410.00,3.3
 3208,+11.9,3.5,101, 70,   00,  rich,+12.4,  40.5, +7.9, +2.5,410.00,3.3
 3195,+13.5,3.5,101, 80,   00,  rich,+12.2,  43.6, +5.6, +2.7,410.00,3.3
 3236,+14.9,3.6, 90, 80,   00,  rich,+13.7,  44.7, +5.2, +2.7,390.00,3.4
 3236,+16.1,3.5, 47, 90,   00,  rich,+14.2,  40.8, +9.0, +2.8,288.00,3.3
 3258,+15.5,3.0, 11, 80,   00,  rich,+21.1,   9.7,ECU. , +2.7,ECU.  ,2.4
 3223,+11.7,2.1,  0, 40,   00,  rich,+33.1,  18.2,ECU. , +2.2,ECU.  ,2.1
 3290, +6.2,2.2,  0, 10,   00,  rich,+29.0,   8.2,ECU. , +0.6,ECU.  ,2.0
 3258, +0.0,2.1,  0, 10,   00,  rich,+15.6,   7.0,ECU. , +0.6,ECU.  ,1.9
 3229, -5.3,2.0,  0, 00,   00,  rich,+11.5,   6.4,ECU. , +0.0,ECU.  ,1.8
 3255, -7.9,1.9,  0, 00,   00,  16.1,+11.5,   6.4,ECU. , +0.0,ECU.  ,1.8
 3226, -9.1,1.8,  0, 00,   00,  23.7,+11.5,   6.4,ECU. , +0.0,ECU.  ,1.7
 3226,-10.2,1.8,  0, 00,   00,  23.7,+11.3,   6.4,ECU. , +0.0,ECU.  ,1.6
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Old 05-30-2006, 12:39 PM   #2
Master2192
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What is your elevation? Also, are you pushing as much boost as the people with MAF voltages in the 4s?
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Old 05-30-2006, 12:51 PM   #3
hippy
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You're not gonna get 4.something volts at 3500rpm unless you run a lot more boost. Engines naturally take in more air as rpms rise, so at 4500 or 5500rpm you have a much better chance of getting 4.something then at 3500rpm.

peace
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Old 05-30-2006, 12:55 PM   #4
hippy
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Code:
 3109, +7.6,3.3,101, 50,   00,  rich,+15.5,  32.5,+20.9, +2.4,410.00,3.1
 3147, +8.8,3.4,101, 50,   00,  rich,+15.2,  35.1,+20.6, +2.4,410.00,3.2
 3147,+10.2,3.5,101, 60,   01,  rich,+14.4,  39.1,+10.3, +2.5,410.00,3.3
 3208,+11.9,3.5,101, 70,   00,  rich,+12.4,  40.5, +7.9, +2.5,410.00,3.3
 3195,+13.5,3.5,101, 80,   00,  rich,+12.2,  43.6, +5.6, +2.7,410.00,3.3
It's a knock. See how the ecu wants to run 15.5 degrees of timing but the utec is running 20+? You're running too much timing in the 50% load column at about 3000-3250 rpm. You might be running too much timing in other spots too, but it's hard to tell by the log.

You're not gonna get 4.something volts at 3200rpm unless you run a lot more boost. Engines naturally take in more air as rpms rise, so at 4500 or 5500rpm you have a much better chance of getting 4.something then at 3500rpm.

peace
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Old 05-30-2006, 01:07 PM   #5
baldchicken
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Quote:
Originally Posted by hippy
Code:
 3109, +7.6,3.3,101, 50,   00,  rich,+15.5,  32.5,+20.9, +2.4,410.00,3.1
 3147, +8.8,3.4,101, 50,   00,  rich,+15.2,  35.1,+20.6, +2.4,410.00,3.2
 3147,+10.2,3.5,101, 60,   01,  rich,+14.4,  39.1,+10.3, +2.5,410.00,3.3
 3208,+11.9,3.5,101, 70,   00,  rich,+12.4,  40.5, +7.9, +2.5,410.00,3.3
 3195,+13.5,3.5,101, 80,   00,  rich,+12.2,  43.6, +5.6, +2.7,410.00,3.3
It's a knock. See how the ecu wants to run 15.5 degrees of timing but the utec is running 20+? You're running too much timing in the 50% load column at about 3000-3250 rpm. You might be running too much timing in other spots too, but it's hard to tell by the log.

You're not gonna get 4.something volts at 3200rpm unless you run a lot more boost. Engines naturally take in more air as rpms rise, so at 4500 or 5500rpm you have a much better chance of getting 4.something then at 3500rpm.

peace
So does this seem like a bad tune? Or could this be a malfuntion of a sensor? I got this profssionally tuned and it ran perfect for about 3 months, then its been off an on with pinging and not pinging. I ran some seafoam through my car and ran good for about 2 weeks... now its back again. I am trying to find out what is going on with my car....

Also I guess I am confused, that the car is running rich when it pings?!?
And maybe you can answer, "Is the Mod Ign deg supposed to be the same as the ign#1 duty?"

Any tests or items you suggest me take? Can I post another log and have you look at it for me?
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Old 05-30-2006, 02:09 PM   #6
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No, they're not supposed to be the same. Ign#1 is what your ECU would be running. Mod Ign is what your UTEC is set for.

#1, you can probably pull some timing where you are getting knock (i.e. around 50% load at 3000rpm). That's not a false reading. Fix the tune, don't drive through it. It won't just "go away". Post your timing map and I'll make a direct suggestion.

#2, shift when you want to go fast rather than pound the gas at 2800rpm. You should be able to hit 4.2-4.3v at 5000-6000rpm on a stock diameter intake and stock turbo.

#3, "rich" means "something under 12:1 or so, give or take, approximately, kinda sorta, we guess". It's not for tuning.
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Old 05-30-2006, 02:27 PM   #7
baldchicken
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Quote:
Originally Posted by Freon
No, they're not supposed to be the same. Ign#1 is what your ECU would be running. Mod Ign is what your UTEC is set for.

#1, you can probably pull some timing where you are getting knock (i.e. around 50% load at 3000rpm). That's not a false reading. Fix the tune, don't drive through it. It won't just "go away". Post your timing map and I'll make a direct suggestion.

#2, shift when you want to go fast rather than pound the gas at 2800rpm. You should be able to hit 4.2-4.3v at 5000-6000rpm on a stock diameter intake and stock turbo.

#3, "rich" means "something under 12:1 or so, give or take, approximately, kinda sorta, we guess". It's not for tuning.
AWESOME!!! I really appreciate your time Freon. I am going to take my car to get professionally tuned in about a week. I just didnt want to take the car in to get tuned if that wouldnt help. But if this seems like a tuning issue then I will spend the $300 to get it done.

Thanks again for the help!
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Old 05-30-2006, 03:26 PM   #8
hippy
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If you already got the car tuned and what not, there's no need to do it again. You're probably havin problems cause of the changes in weather(hotter now). You might wanna go back to where you got the car tuned, and have them fix the problem. Could be as easy as changing some of the temp compensation settings, and they might not even charge you anything.

peace
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Old 05-30-2006, 03:33 PM   #9
baldchicken
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well I added a bigger IC and also added a perrin DP. So it needs to get tuned for the new found power again.
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Old 05-30-2006, 03:37 PM   #10
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That makes sense........ I shoulda said you shouldn't need to be tuned again if nothing has changed. Oops.

peace
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Old 05-30-2006, 03:46 PM   #11
baldchicken
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Quote:
Originally Posted by hippy
That makes sense........ I shoulda said you shouldn't need to be tuned again if nothing has changed. Oops.

peace
I guess ill forgive you this time, you know considering you are a HUGE help to me!!!!

Thanks again!
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Old 05-30-2006, 03:47 PM   #12
baldchicken
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but just an FYI this started pinging before I added those pieces.... doesnt really matter though, cause I still need to get it tuned again
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