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    2017 Enclave P0131 P0137 P0151 P0157 P0171 P0174

    My mothers Enclave just started having 'running issues' as she put it yesterday. The way she was describing it, it sounded kind of like a torque converter partially locking while stopped, because she said the issue went away when she got moving, but when I got there today to see what I could...
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    Tech 2 VATS relearn

    Does anyone here have a Genuine Tech 2 on the current/final version (33.004)? I would swear there was a way to do a VATS relink using a Tech 2, but I can't find it for the life of me. From doing some searching, there's supposed to be somewhere that you can select setup, and if it's missing it...
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    2001 Sierra 8.1 crank no start then start

    My Step Father has a 2001 Sierra with the 8.1/Allison that has only like 80k on it, lived in a garage most of its life with trips to Vermont and Florida mostly. A few years ago, IIRC, it started throwing a crankshaft sensor code, and I replaced the sensor for him. Everything had been fine since...
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    HVAC blowing hot on one side and cold on the other with a twist

    Last week, when I got my truck started after finding the battery stone dead and getting it changed, letting it run, it ended up blowing hot out of the drivers side vents and cold out of the passenger side, with both sides set to '60*'. Figure it's likely the common issue of a bad blend door...
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    Calling all Armchair accident reconstructionists

    So my sister and Niece were in a crash yesterday with her bosses car. Let me first say they're both 100% ok. The airbags didn't even deploy, and to paraphrase a GM SRS engineer that I spoke to way back at probably the first Merchant 'Spring Fling', where I asked him about a 'significant' crash I...
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    Speed of air pistons

    Has anyone ever heard of these 'speed of air' pistons? I found them perusing the screwtubes, and they apparently have a ceramic coating, 'golf ball dimples', a 'gapless' second ring and supposedly have some significant benefits including lower emissions, quieter operation, more power, lower...
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    Another non-Allison (6T70) question for the experts

    Ok, so sorry for another non-Allison question, but some of the most known and respected transmission people are here... So back in 2021, the 6T70 in my wife's 2015 Malibu ate itself to the point there was ZERO motion in either direction, no matter what I commanded with GDS or anything else, and...
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    10L80 P0777

    Just had a 'limp event' with my CT6 on either the 1-2 or 2-3 shift (wasn't paying attention at the time), so I limped into the nearest parking lot and power cycled the car, after which it returned to shifting ok. Got it home and pulled info with GDS2, and found the P0777, so Monday, I'm going to...
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    Stock T43 Tune

    Ok, so this is not Duramax related lol, but does anyone happen to have a stock tune for a 2009 Escalade T43 that they could share?
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    Water intrusion

    I've been having water get in on the drivers side, soaking the carpet, but I haven't been able to find anything to point to a general location that the water is getting in, until today. I found it running down the side of the parking brake and dripping from there. Does anyone have any thoughts...
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    LBZ Block worth?

    I have an LBZ block from when I converted my truck from LLY to LBZ over a decade ago that's just been sitting in the garage since then. The 'original' plan was to built it and then swap in with the existing LBZ top end, but you know what they say about the best laid plans of mice and men. It is...
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    2015 Malibu (and others) connector type/de-pinning

    Does anyone happen to know what type of connector the X1-X4 connectors the ECC control module on a 2015 Malibu, among others, is, and what kind of tool is required to de-pin the connector? I've exhausted my resources and cannot find any details on these connectors, and haven't been able to...
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    2007 GMT900 Silverado 5.3 P0191.00

    A friends Silverado has been kicking our butts with a DTC in the ECM that I can't recall stating that the FPCM has issues (Similar to the TCM's P0700) and FPCM P0191 00 and recently also a P0192 00. The parts canon has been fired but the issue still is present, and it seems to be somewhat...
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    Another Non-Duramax question - 2011 Aveo

    I have a friends 2011 Aveo, which had initial symptoms of it just died and they were able to jump it for a bit and then couldn't - this sounded like an alternator issue, and when we went to retrieve it from the side of the road, the battery (only about six months old) was at 11.8v, although it...
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    Not Allison rebuild question

    First off, this is not about an Allison, but I imagine that most transmission experts like Mike knew a LOT about more than just one transmission. That being said, hopefully some of the experts here are familiar with Ford's 4R70W and can give me some pointers. I have a 95 Cougar, that currently...
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    Vehicle fuel/maintenance log software?

    Does anyone know of any good fuel/maintenance log software? I found 'Simply Auto', which seems pretty good, but what I'd really like to find is something that has an android and PC version, that can sync to each other, WITHOUT 'the cloud'. I don't want my data uploading to 'the cloud'. Ideally...
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    Non-Allison - Mike or Evan know anything about a 6T70?

    I know this isn't Allison related, but Mike Mike and Evan are the most trusted 'go-to' people for transmissions, so hopefully one of them knows something about the 6T70 transaxle (I THINK that's what's in the car, I haven't been able to definitively confirm it... it's almost certainly a...
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    Any home A/C experts here?

    Have an issue going on with the central air in my house. I've noticed that recently, ti'll cycle in the through the morning, then around mid day, it'll come on and not shut off until 3-4am or so. Checking the temperatures of the return and supply, there's a 15* or so degree difference, but I'm...
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    Bleeding a new master cylinder

    Has anyone used a tool like this to bleed a new master cylinder? Int he past, I've used this to purge one, and t was a bit of a pain... Is the syringe style better and more effective?
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    TPMS problem

    I just got new tires and replaced all of my TPMS sensors as one of them was starting to flake out, and I've got an issue with them. I ordered the AC Delco 'TPMS173K' from Rock Auto, which appear to have a pretty broad application chart. Fords, Hundais, Kias, Nissans, Chevys, etc. I set my...
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