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  1. #1
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    fuel trims +17

    ok i got a 2007 new body style silverado, and when the valve covervent that goes to the intake is vented to the atmosphere the fuel trims go +17,18 OR 19 L like it has a vacum leak, but i plugge it and they 0 out and the intake side is plugged to so not leaking from there
    Last edited by spygst; 03-17-2011 at 10:51 PM.

  2. #2
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    I seriously suggest you unplug that. It's the crank pressure vent. I vented mine to atmosphere on my 08 and tuned accordingly.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  3. #3
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    Quote Originally Posted by spygst View Post
    ok i got a 2007 new body style silverado, and when the valve covervent that goes to the intake is vented to the atmosphere the fuel trims go +17,18 OR 19 L like it has a vacum leak, but i plugge it and they 0 out and the intake side is plugged to so not leaking from there
    yeah i unplugged it i just plugged it to check the fuel trims i actaually ran it to a vacum source to 0 nout fuel trims

  4. #4
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    Just know that there are oil vapors coming out of that line.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  5. #5
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    Mar 2011
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    ok so the question was why r my fuel trims going crazy by that being dissconected
    Last edited by spygst; 03-18-2011 at 02:14 AM.

  6. #6
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    Because there are gasses that are accounted for in the tune. When you remove the gasses it runs lean, and the computer dumps more fuel.
    cjriojas:if you're weather man is a 5 gallon bucket, YOUUUUUUUUUUU might be a redneck
    danger_ranger83: I see now why it cost so much to get a harness made... FML
    2boostedSilverado: I like Casey's rear end, I want to chat with him about it

  7. #7
    Join Date
    Aug 2007
    Location
    Honeywood, Ontario
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    6,994
    You're covering the hole in the intake right?
    2006 Silverado
    Little Black Bitch

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