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I put the ISS and OSS in the chart, and they drop out multiple times through out the log.
I don't know how accurate the TCC applied PID is, but it says it's applied in 1st and 2nd gear at times.
I'm not too familiar with a factory PCM and how the converter locks up but I believe they can be locked in all gears but that's not really worth the time. I only mine up in 4th
And if he's only using the VSS then I'd first take the front sensor ISS and swap places with the VSS and see if that fixes his issue
Jay, I have checked for DTC's and so far there are none, just your typical MAF err code since i'm in speed density. As for the shift pressures, I haven't touched them myself. I do know that my tuner made some adjustments to the shift scheduling, 1-2 shift at 17mph etc. But as far as the shift pressure thing I'm unaware of, still trying to learn the ropes of all the trans diag stuff, so I apologize. Here's a screenshot of the general shift pressures on my current tune:
Now in regards to the ISS/OSS, my builder said that they were new speed sensors, but I've had my fair share of parts that are "new" that go belly up right off the bat. I think you guys are correct, before I start looking towards the vb I might try replacing these first, or hell just testing them with my multimeter. I appreciate you guys taking the time to look through the logs!
Jay, I have checked for DTC's and so far there are none, just your typical MAF err code since i'm in speed density. As for the shift pressures, I haven't touched them myself. I do know that my tuner made some adjustments to the shift scheduling, 1-2 shift at 17mph etc. But as far as the shift pressure thing I'm unaware of, still trying to learn the ropes of all the trans diag stuff, so I apologize. Here's a screenshot of the general shift pressures on my current tune:
Now in regards to the ISS/OSS, my builder said that they were new speed sensors, but I've had my fair share of parts that are "new" that go belly up right off the bat. I think you guys are correct, before I start looking towards the vb I might try replacing these first, or hell just testing them with my multimeter. I appreciate you guys taking the time to look through the logs!
Swap places with those sensors and see if that works. It's the easiest thing. Take the front sensor and put it in the rear and the rear to the front
So far, I know that the trans is being commanded the shifts, nothing has been damaged yet judging off how the fluid looked (brand new, red, no soot, no clutch material.) But I haven't even really driven it yet. Highest mph I got up to was like 30mph before realizing the car just kept climbing the RPMS as the shifts were being commanded. I just can't feel it whatsoever, I'm caught between a valvebody issue or a sensor issue. Somethings not getting pressure somewhere for sure... IMO.
Definitely going to test the OSS first and then if that is good, I'll hook a pressure gauge up to the thing and test if I'm getting pressure at all.
One last thing, 4L80E guys.. do the shift pressures look at all accurate? Or do they need to be raised to feel any firmness on the shift? I'd assume they are but after doing a quick google search it seems as if they need to be raised. I could get with my tuner and see if a % raise will have any drastic change on shift firmness without damaging anything.. Just a thought
" I've checked the placement of the end of the dipstick which sits just a little past the valvebody."
That's not how to verify the stick length.
Pan rail to full mark on the stick.
I got underneath the car and took a look at both speed sensors, the front speed sensor looked brand new, although it wasn't plugged in per the instructions of my trans harness, I still wanted to make sure it wasn't used. However... the rear was definitely a used sensor, and the connector to the sensor had exposed wires that were coiled around each other... not good.
So I replaced the rear connector and the sensor, made sure everything was nice and secure this time. Took the car out for another spin, noticed that it felt like there was less strain on the transmission and the car moved with a little more ease this time around. However... still no feel of any shift. Wondering if theres any line pressure at all now, and I did notice a tad bit over converter whine this time around . When I mated the trans and the engine together I know you have to verify the converter pad spacing with the flexplate, with my combo there had to be an 1/8th inch gap for proper engagement, otherwise.. you all know front pump failure could ensue.
What I am going to do next is re-verify the spacing (im pretty damn sure I had it correct the first time around but doesn't hurt to take another look)
If all is correct there then its time to throw a pressure gauge inline and see if I am getting 170psi at idle. If not this could tell me that the valvebody is an issue. I'll follow up on what happens soon.
Jay, sorry for the late reply man, just got off work.
I do have the log, I'll throw it in this post. As for the ISS reading without being plugged in is sorcery to me. Made sure to verify with the company that it absolutely cannot be plugged in.
Additionally, this time around the car felt much easier to drive. Felt like it had less strain on the car it started to just get up and go. Swapping that speed sensor out must've done something correctly, it just wasn't the solution to the entire problem.
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. When I mated the trans and the engine together I know you have to verify the converter pad spacing with the flexplate, with my combo there had to be an 1/8th inch gap for proper engagement, otherwise.. you all know front pump failure could ensue.
