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Thread: Big off idle stumble, whatt first? IFR? calc.vet? Something else I'm missing?

  1. #151
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    Can do. I'm having trouble figuring out how to set up a 2D map to monitor cell counts in a way that mimics the MAF calibration map in the tune. How do I get it to read in a single column? It's plenty easy to use the tool to build the 85 rows.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  2. #152
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    I haven't used the scantool maps in quite a while, but I just set one up for old times sake (and to remind myself how to do it). You just have to select "Open Map" and then choose any of the ones labelled "{B5001} MAF Calibration" and it sets it all up for you.

  3. #153
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    Well the sensor didn't show up today like I had hoped. Monday it is, I can't wait to have this buttoned up. It's already way better than before, start and restarts and tip in are solid and will only require tweaking after the MAF and VE get to where they need to be.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  4. #154
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    So the sensor I screwed in back in 2009 refuses to come out in 2020. Not even vise grips and a cheater pipe would touch it after 3 rounds with the propane torch. Hopefully I can score a new O2 bung tomorrow and if so I'll just shove the new sensor in there and go for a log. Typically the vise grips and pipe with a torch are the end all to a stuck O2. I've never been boondoggled so hard by a damned O2.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  5. #155
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    Quote Originally Posted by Supercharged111 View Post
    So the sensor I screwed in back in 2009 refuses to come out in 2020. Not even vise grips and a cheater pipe would touch it after 3 rounds with the propane torch.
    I said it in August 2017...

    Quote Originally Posted by statesman View Post
    You really like doing things the hard way... don't you?
    And I'll say it again now....

    You really like doing things the hard way... don't you?

    Try spraying on some penetrating oil... and then wait at least 24hrs for it to 'penetrate'. Then crack it cold, not hot.

  6. #156
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    Unfortunately I have to drive this to work every day so 24 hours won't happen soon, but I'll try a couple overnighters leading up to the weekend. The current sensor is in an excellent location and I'd prefer to keep it there, but zapping in a new bung may end up being easier than fighting with that sensor if none of the tricks end up working. I've never had great luck with penetrating oil, the torch always seems to be the thing that saves my ass. I may be able to borrow a real torch this weekend so may have that at my disposal, I have a solid axle that needs a little negative camber and made a deal on some acetylene torch usage but that agreement was initially at my neighbor's shop.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  7. #157
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    Shortly after my last post, I encountered some aging/injury issues that precluded the use of my right hand/arm to the extent necessary to muscle this O2 sensor out. I just got the sensor swapped out last night and, MAF only, I'm pig rich at WOT so will get a log up here real soon along with my own hack at the MAF to get an idea of any deltas between where I think things should be and where they really ought to be. With the transient fueling where it is now even MAF only the truck's driveability is better than it has been in years.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  8. #158
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    Don't beat up your MAF curve... just get a log for me using the last tune file I gave you.

  9. #159
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    I have no intent of flashing whatever I come up with, just want to compare it to what you come up with.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  10. #160
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    Here's what I got tonight, after 13,000 it's basically just coasting home downhill. I got bored at a red light and killed it there. Let me know if this flies, I'm going to read over autoMAF again as I'm guessing that's what we're doing now?

    Statesman MAF Only 2.efi
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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