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  1. Thread: pegged 02 sensors

    by JoeR
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    What's the voltage on the O2 signal wires? Is it...

    What's the voltage on the O2 signal wires? Is it 1100 mV or higher? If so, sounds like a ground is off.
    Joe
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    Or just log the trans data. It will tell you...

    Or just log the trans data. It will tell you commanded gear. If you're pulling it into L1 but the scanner reads L2, you just figured it out.
    Joe
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    Some folks report that with bigger camshafts and...

    Some folks report that with bigger camshafts and uneven exhaust flow that you'll get some fresh air in there at idle. I don't see that as too big a deal, because the O2s and wideband don't give a...
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    Try to connect and read data before stating the...

    Try to connect and read data before stating the engine. I've had the same trouble with mine along with it not logging anything at high RPMs. If you strarted scanning the vehicle before starting it,...
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    Update: These errors are fixed in the latest...

    Update: These errors are fixed in the latest Alpha firmware update for the VCM.
    I'm sure the repair will make it into the next version of release software.
    Joe
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    Sounds like you're going to be pulling the trans....

    Sounds like you're going to be pulling the trans. Regardless of any electrical input, you'll always have forward and reverse drive engagement.
    If you completely unplug the connector from the trans...
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    Does this happen to you on more than one vehicle?...

    Does this happen to you on more than one vehicle? Every other vehicle I have tried so far seems to work as designed, but this one lq4 does it every time. I had to use a different scanner to tune...
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    Someone just tell me this is or isn't normal. ...

    Someone just tell me this is or isn't normal. See the linked vid.
    If you try to scan the vehicle with the engine running, all you get it OBD2 data. No OEM PIDS.
    You can try to repoll but the...
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    Thanks for the reply. I've done a lot to get the...

    Thanks for the reply. I've done a lot to get the data to appear correctly, including using 2 different laptops. The software is WAY buggier on Windows 10 than it is on Windows 7.
    To answer your...
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    VCM Scanner not showing RPMs above 3400

    I'm a rookie tuner, but I've done a half dozen tunes successfully so far. This one is behaving differently.
    Engine/Trans and PCM is from a 2003 Express Van. 6.0L/4L80E.
    I've been chasing the SD...
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    I'm nearly certain it can be done. I see posts...

    I'm nearly certain it can be done. I see posts about folks swapping in MAFs with larger diameters, so it shouldn't be a problem, but I wanted to make sure before I spent the money. I'm going to...
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    Using a different MAF

    For an LS Swap I'm doing I've got a 6.0L Vin U engine from a 2003 Express Van. In the van it used a goofy MAF Sensor, AC Delco Part # 19351884
    If you're looking for a MAF and plumbing at a scrap...
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    Then I'd agree there's a scanner problem. Can you...

    Then I'd agree there's a scanner problem. Can you get your hands on something different?
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    I've never tried it with the HP Tuner, but I've...

    I've never tried it with the HP Tuner, but I've done it with the Tech 2 and Snap-on Scanners. It can be a pain unless you do it correctly.
    The procedure is as follows:
    Warm the engine.
    Command...
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    Exactly! He should be happy we got rid of the...

    Exactly! He should be happy we got rid of the droning noise by killing the DOD.
    Funny that all of this started with killing his VATs because he was having intermittent troubles with it.
    Joe
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    Thanks for the reply. We were temporarily...

    Thanks for the reply. We were temporarily disabling the P0420/P0430 codes while trying different exhausts. By unchecking the SES light box the tests for the Cats still ran and set the codes (as...
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    SES Enable Vs No MIL Light

    Any chance anyone can explain to me the difference between the choices of SES Enable and No MIL Light in the Engine Diagnostics Tab?

    I tried a search with both of those phrases and came up empty,...
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    You bet. Easy to test. With the TCC turned on,...

    You bet. Easy to test. With the TCC turned on, TCC slippage should be under 100 RPMs. When it is totally locked it it is not uncommon to see slippage as a negative number. It's not really...
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    The brown wire won't lose 12V when pressing the...

    The brown wire won't lose 12V when pressing the brake pedal on your car. It was the case on older vehicles, but not yours.
    On your car, 12V feeds the power side of the TCC solenoid through the 15A...
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    Thanks to everyone that contributed here. This...

    Thanks to everyone that contributed here. This truck is shifting normal with a Speed Density Tune.
    Tune is attached.
    Joe
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    Thanks!, but no codes anywhere. Any chance you...

    Thanks!, but no codes anywhere. Any chance you know how to tell what trans map the truck is using when it is in Speed Density Mode? Maybe if I can find the specific table I can make sure I am...
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    ' The truck started with the latest cal...

    '

    The truck started with the latest cal available on GM's SI. You're right that I made a lot of changes, and none of them made the slightest difference in the 1-2 shift. When you're in SD mode,...
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    Truck is lifted 8 inches and has 37.5-22 tires on...

    Truck is lifted 8 inches and has 37.5-22 tires on it. Way bigger than stock.

    When I looked at my original post I see I really didn't have a clear question. I'd like to fix that!
    What trans...
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    Interesting you say that. Previous shop thought...

    Interesting you say that. Previous shop thought it might be related to traction control and disabled the ABS without any change.
    Thanks for the reply!
    Joe
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    Sd Harsh Shift Troubles

    2007.5 Silverado, 5.3L

    Sorry for what is probably a noob problem. I've done a bunch of searching, but the learning curve is pretty steep when you're first starting out.
    This is my first tuning...
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