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  1. beady

    1987 454 TBI stalls at idle after a short time

    Oh yeah, the O2 sensor ground (pin D6?), was NOT present previously. All the results above, and the surging in closed loop are WITH the ground present. I grounded D6 with a jumper cable. O2 reads now, but o2, blm, and int tables barely register.
  2. beady

    1987 454 TBI stalls at idle after a short time

    Video of truck surging at idle in closed loop:
  3. beady

    1987 454 TBI stalls at idle after a short time

  4. beady

    1987 454 TBI stalls at idle after a short time

    Bill, here are the voltage/ohm readings. The key on, engine off readings were taken cold.
  5. beady

    1987 454 TBI stalls at idle after a short time

    Bill, I took all the voltage and ground readings, will post those from my phone in a minute, but I'm posting the winALDL log I took this morning while the truck warmed up and I took readings. It is/was mid-70's outside and the truck was stone cold, not started for days. I think I started the...
  6. beady

    1987 454 TBI stalls at idle after a short time

    Bill, just found this thread where the OP sounds like he has the same issue I do (no O2, int, blm cells populate). His issue was a chip burned to ignore the o2. I did get the o2 cells to populate a couple cells one time on one of the earlier data logs I posted, so I’m not sure it’s apples to...
  7. beady

    1987 454 TBI stalls at idle after a short time

    Bill, I have not checked d6 to ground, will today after work. I used a 3-wire to 1-wire adapter harness. It just has flying leads for +12 and ground and a mating cylindrical connector for the existing 1-wire connector on the factory body loom. So I didn’t do anything to have put power on d6...
  8. beady

    1987 454 TBI stalls at idle after a short time

    3-wire O2 was unpowered, unheated while I was bench testing it. I was only measuring the element response. One probe to sensor pin/wire, the other to O2 case/ground. The 3-wire sensor WAS heated when installed in the truck and showing readings at the ECM pin. Is there any reason that...
  9. beady

    1987 454 TBI stalls at idle after a short time

    Bill, Temp sensor wasn’t unplugged or disturbed, don’t know what to say about that. On winALDL the temp matches reality, i.e., if it’s in the 60’s out and truck is cold it reads 60’s, then it climbs up to 190 ish or whatever as truck warms up. So it seems to behave normally? So it seems the...
  10. beady

    1987 454 TBI stalls at idle after a short time

    Been off on a dozen other things, and bought a 2005 LLY Duramax 3500 with blown head gasket, but back on trying to figure out what’s up with the Suburban. Here are the cold engine, key on, engine off readings. I had a battery charger on the truck. Resistance btwn D7 o2 sensor pin at ecu...
  11. beady

    1987 454 TBI stalls at idle after a short time

    Th400 was rebuilt just before I bought it, so trans was definitely out. Don’t think engine was, but don’t know. Rear AC doesn’t work (yet). I replaced the compressor, condenser, evaporator, dryer. I pulled and flushed rear evaporator and flushed all lines and hoses. I haven’t vacuumed...
  12. beady

    1987 454 TBI stalls at idle after a short time

    Thanks, lol. I figured if I gave good background what I’ve tried it would get better results. The problem has sort of morphed along the way, but have made lots of progress. Mike
  13. beady

    1987 454 TBI stalls at idle after a short time

  14. beady

    1987 454 TBI stalls at idle after a short time

    I went ahead and installed the 3-wire O2 but just rigged up the power to it temporarily. There are more O2 sensor readings now, but it doesn't change a lot. It still populates zero cells in the BLM or INT tables. I don't know why. It does populate the O2 table cells though. I took a short...
  15. beady

    1987 454 TBI stalls at idle after a short time

    I went and drove it while you were posting that to see what happened. I did get a few hundredths change and it populates 3 cells of the O2 table. The truck has what look like aftermarket cast manifolds. The O2 sensor is on the driver side collector, o2 reading only changed when I got on it a...
  16. beady

    1987 454 TBI stalls at idle after a short time

    Sorry, was too damn cold to do anything for seemingly weeks, then I had the flu this week. I bought a new Bosch 12014 single wire O2 sensor (didn’t want to mess with adding other variables with 3-wire, and cheap) and installed it today. Computer not seeing the O2 sensor it seems, reading...
  17. beady

    1987 454 TBI stalls at idle after a short time

    Thanks Bill, that was super helpful info, I really appreciate you taking the time to post those hints. The install went well and the only thing I had to do was change the baud rate to the higher vale (4800?) to get things to work. First issue, the datalogging stops after a short time. Maybe...
  18. beady

    1987 454 TBI stalls at idle after a short time

    That’s super helpful info on the WINALDL, thanks! Cable should be here Thursday it says. It’s one of my son’s old laptops, I think he said windows 7? I need to boot it up and check. Mike
  19. beady

    1987 454 TBI stalls at idle after a short time

    Thanks Bill, Sorry, for the long post below: When I said I don’t need “timing” in that post, I had typed “tuning” and it got autocorrected. For now I just want the easiest software install that isn’t going to give me fits about PC operating system not being the right version, etc. I can...
  20. beady

    1987 454 TBI stalls at idle after a short time

    I ordered a cable. That’s my concern too, that it’s going to be a pita to get working without downloading a bunch of different softwares. I just want the easy button approach. Nothing fancy, no timing, etc., for now, just be able to see live data.
  21. beady

    1987 454 TBI stalls at idle after a short time

    I had an OTC scanner that would show you data. But not graphically, and it got stolen. I ordered an ALDL usb cable yesterday, hopefully I can get it to work. It seems very difficult to find any of the scanners that read ALDL data currently for some reason Previously, I did have a problem...
  22. beady

    1987 454 TBI stalls at idle after a short time

    Well…. I went to check timing (it was about 20 degrees btdc) and I pulled the timing connector wire to check base timing and the engine immediately almost died and started surging. Now it struggles to stay running again, lol. The timing with the wire disconnected is about 4 degrees btdc...
  23. beady

    1987 454 TBI stalls at idle after a short time

    Thanks for that. However, since I complained the truck has been running normally, go figure. I’ve done probably 8 dead cold to operating temp, back to dead cold, including sone errands and turning the engine on and off and it only had one bauble. That was one of the first drives when a dog...
  24. beady

    1987 454 TBI stalls at idle after a short time

    Thanks for the detailed reply. I had a scanner that would give ALDL live data until about a week ago. My son borrowed it for his friend to use, and the kid’s car got broken into and the scanner stolen from his trunk : ( I’m handy with a DMM (love my fluke 179 that has a thermocouple for temp...
  25. beady

    1987 454 TBI stalls at idle after a short time

    MAP sensor is a couple months old, a couple hundred miles old, tops. I haven’t tried spraying starting fluid around intake to check for leaks yet. But it doesn’t have a high idle, and doesn’t hunt either.

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