Search results

Not getting any codes set but it does fail TID$07 Screenshot from torque pro:

I'll check both. Right now we're prepping for 12deg nights, in Texas... The distributor has been changed, twice before I got it. Not sure if it has been "timed". Might that be a factor? Also crank position sensor has been changed before I got it.

@ak diesel driver It actually does the same cold and at op temp. You have to keep your foot in the throttle a little to keep it locked even at it's first "stage" at any temp. Also forgot to mention, the TPS voltage is stable. I even tried a different TPS just to verify.

So my 1999 K3500 7.4l L29 4l80e 4 10 rear, hits all the gears and semi locks up when it should on acceleration, then when you get out of the throttle to maintain your speed it falls out of lockup. It's like you reduced the throttle to 0 and lockup releases, but it happens about 10% throttle. I...

Thanks. It did shift pretty wonky, but it did shift. Shifted late, except for 1-2, and it wouldn't stay in 4th unless you kept a load on it. Did all it's shenanigans without ever setting a SES light.

Thanks f Thanks for the compliments all. I also met a real fine fellow truck driver (the previous owner) in the process as well as a pretty nice forum with actual help. All around blessed by the process.

After a bath, still need to polish those nasty wheels.

Here's a pic before I cleaned her up.

Thank you for your valuable help. The key for me was knowing there was 2 speed sensors. I've been building engine and transmissions since the 60's. Obviously never done a 4l80E. I also learned about the wild world of pids and the vast amount of information I was missing, not knowing about...

Problem sorted Started thinking about the info the input vs output that Torque Pro pids were giving me. It makes sense the input shaft will spin freely in neutral, stops when dropped in gear before vehicle moves, two identical VSS's on trans ... VSS' were plugged in backwards! Now on to...

@dbrannon79 Ok, found and installed the standard pids for gm n such. Made a custom display and see the output VSS is giving the bs info. Not sure how to attach a screenshot yet... @ak diesel driver, I'll try the serpentine belt removal. Are you thinking alternator noise is getting intp the...

Still not sure what Torque PIDs are. In my motion control world (mostly CNC machine tools) a PID defines an algorithm that closes a position loop that you tune so the axis doesn't over or undershoot it's desired location. Time to dig in a little deeper.

@dbrannon79, Nice info. I didn't realize we had an input VSS. I'll crawl under and check it in the am. I'm guessing they are the same sensor, I only see one part number listed, however it lists the same number for my 99 yukon and the 4x4 transfer case has a different one altogether. I'm using...

Thanks dbrannon79. It does have a 4L80. I'm not aware of 2 speed sensors. It is a two wheel drive, I addressed the VSS near the tailshaft housing on the driver's side. Where would I look for the second? I did get a mostly complete donor harness and I was just going over what you talked about...

Hi all. Been looking the forum over a bit, decided to join cause I see a lot of stuff being discussed that I involve myself with, "for fun". New truck, to me. 99 C3500 dually 7.4l auto trans. Speedometer reads while parked. Goes up as high as 50mph while revving the engine in neutral, while...