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Old 05-11-2022, 12:26 PM   #61
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Default Re: 1999 SOCH auto transmission problems

The "fuse pull" shows the pump can produce required pressure, but the rest is inconclusive to me. There was more flickering of the gauge needle than I was expecting, and the scanner images were too poor for me to use at all. Again, you want to compare the gauge reading to the "pressure commanded" that is displayed on the scanner. Did they correlate pretty well?
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Old 05-11-2022, 01:14 PM   #62
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Default Re: 1999 SOCH auto transmission problems

The gauge needle was probably vibrating with the movement of the car, I had intended to look at other charts later, but the hose to the gauge came off before I got around to it. You can see the pressure drop when the hose came off at the 9:55 mark of the 2nd video. The pressure was about 130 PSI at that moment. I also intended to see what pressure looked like when controling the solenoids with switches. What about the video quality makes it unusable? Was it because it kept falling off the dash? The charts are visible, the latest readings are on the right side of the screen, and scroll to the left, from top to bottom, those charts are engine speed, turbine shaft speed, vehicle speed, and TCC slip. the video is in real time, so time can also be measured.
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Old 05-19-2022, 03:31 PM   #63
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Default Re: 1999 SOCH auto transmission problems

I was not able to get another working hose for the pressure gauge. I drove before resetting the computor https://www.youtube.com/watch?v=KpiTHCi09R0, and after clearing the codes youtube.com/watch?v=pUjip2eY680, I also recorded what happens when manually controlling the transmission with switches https://www.youtube.com/watch?v=raJZtwuNybs, anyone watching this will either laugh, or cry...
The video quality is perfectly usable, even though the screen is crooked. I hope that some of this footage is usable, or entertaining.
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Old 05-19-2022, 03:39 PM   #64
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Default Re: 1999 SOCH auto transmission problems

one thing that I observed when controlling it with switches (other than that the automatic transmission does not like being told what to do), is that while the turbine shaft matches the RPM in 3rd gear, the vehicle speed is not affected much by any of this. it felt like something was slipping/grinding, I suspect the clutch for 3rd gear. Is it time to swap the transmission with the one that I have that I know works?
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Old 05-19-2022, 04:44 PM   #65
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Default Re: 1999 SOCH auto transmission problems

Agreed, those recent videos do show very useful info. Are the data fields the same in all the videos, i.e. (top to bottom) rpm/turbine speed/vehicle speed/turbine slip? Although useful, the videos are still fuzzy enough that I can't quite be sure.

Now for the key question: Are you giving crucial verbal comment that I should be hearing, particularly regarding what gear the trans is in when interesting events happen? The computer I usually use has no sound, so I want to know if it is worth my bother (and the bother to the rest of my family) to pipe the video into a TV. I'm pretty sure the answer is "yes", but gotta ask!

It does seem like the 3rd clutch is slipping, but it will take me a while to review those videos and offer a firmer conclusion. Doing air-checks on the clutches might quickly tell if the 3rd (or any other) are clearing shot.
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Old 05-19-2022, 05:57 PM   #66
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Default Re: 1999 SOCH auto transmission problems

I was making some relevant comments, but also some that were less relevant. I made some comments about the gear that I was commanding during the commanding with switches video. (or at least trying to, before 11:00 into the video)
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Old 05-19-2022, 10:11 PM   #67
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Default Re: 1999 SOCH auto transmission problems

OK, I watched (and listened) all the way through the "manual switching" video; that one only.

Can I assume you have no power to either the LP or TCC solenoids? The hard shifting is due to the LP being forced to full high, and timing/sequencing of the other solenoids is probably not optimal. Are you using a multi-pole rotary switch to change all solenoids kind-sorta simultaneously, or manipulating three individual switches?

For each gear (selected manually) I would like to have you hold the car with the brakes and apply full-throttle to fully load the TC. Doing this, the turbine speed should remain near zero, while the engine speed will get up to about 2500 rpm and go no further. If the trans will not hold the turbine still, then the clutch in that gear must be slipping. If you do get a clutch slipping, back off of the throttle immediately to keep from damaging the clutch (any more). Also, stalling the engine against the TC like that will heat the trans fluid fast, so only do it long enough for engine rpm to stabilize (a few seconds), and let the trans cool for a few minutes after several of these runs. Since you have live-data, look at trans fluid temperature, use that as a guide. I would not want to see it get up higher than 275F.

If you do get clutch slipping, then you really need to pull the trans pan, remove the VB, and do the air-checks. If it passes the air-checks, then the problem is almost certainly in the VB. By "VB", I mean the mechanical/hydraulic components, the solenoids, or even the wiring bus from the solenoids to the external 10-pin connector.

I assume you have already read solenoid resistance. How about drive current in each solenoid coil? Have you ever tried 4th, now that you can force it to 4th at a low speed?
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Old 05-20-2022, 04:33 AM   #68
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Default Re: 1999 SOCH auto transmission problems

I am controlling the solenoids with household light switches, for the first 11 minutes of the video, I was holding them upside down, I was more successful after correcting that, thursday night (when I recorded the videos) was the last time that I will have access to that super advanced scan-tool, so I will need to find another way to see graphs for turbine speed, and most other transmission related things, maybe there is a way to connect a laptop to the obd2 port...
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Old 05-20-2022, 11:28 PM   #69
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Default Re: 1999 SOCH auto transmission problems

There are many inexpensive (< $50) was to get OBD2 live-data via a laptop/phone/tablet. The key search phrase is "ELM327".

Even without any kind of live-data, you should be able to detect gross slippage if you try to stall the engine like I described; just by listening to engine rpm. also, of course, the air-checks require no live-data.

PS: I meant to ask... what in the world is that "tick-tock" I hear in the video? It reminds me of the crocodile trailing after Peter Pan!
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Old 05-21-2022, 03:31 AM   #70
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Default Re: 1999 SOCH auto transmission problems

The only thing that I can think of that makes a "ticking" sound is the turn signal, the entire car also shakes violently when the vehicle speed, engine RPM, and gear ratio do not match. I believe that is most likely the clutches being destroyed, because if the gears themselves were slipping past each other, I think that the fluid would sparkle, and none of the gears would work again.
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Old 05-29-2022, 11:38 PM   #71
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Default Re: 1999 SOCH auto transmission problems

The main reason that it was giving me a hard time last time was because the TCC was switched on. this time it was not, and I held both pedals in all different gears. I have the times that I did this marked, and tried to make comments about what I was doing as well as observations during this video https://www.youtube.com/watch?v=r2aXiQz0yi0.

I also noticed that P0340 is back, it thinks there is a broken cam sensor again...
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Old 05-30-2022, 12:09 PM   #72
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Default Re: 1999 SOCH auto transmission problems

Was the manual shift lever always in "D", for all of those tests? I am puzzled greatly, as you are too, how the trans can hold full engine torque when the car is stopped, but not hold once the wheels are turning.

If you do any more videos, please include more 4th gear operation. I was watching intently as it went 1-2-3, with 3rd slipping, then wanted to see what it did in 4th!
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Old 06-04-2022, 05:33 AM   #73
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Default Re: 1999 SOCH auto transmission problems

I did another video, this time including some 4th gear operation as well. It definitely works more smoothly with TCC off, as it was for the entire video.
https://youtu.be/nmbzakvATgE
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Old 06-05-2022, 05:17 AM   #74
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Default Re: 1999 SOCH auto transmission problems

I noticed yesterday that the battery was low. I thought that it was because I had forgotten to turn the headlights off a week ago, and hooked it up to a charger. Today, it was fully charged, and I drove around for about an hour before the transmission started acting like it does with no wiring harness connected to the top, the radio turned off, the gauges started working intermittently, and the engine ran poorly. I managed to get the vehicle home, clamped the charger on again, it read as 0%, dead. It was running on the battery, I believe that it may be time to look more closely at the alternator.
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Old 06-05-2022, 07:41 PM   #75
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Default Re: 1999 SOCH auto transmission problems

I did a test suggested by OldNuc in this thread. http://www.saturnfans.com/forums/sho...d.php?t=156458
The battery voltage was initially 12.6V, after charging it overnight, it only went down from there. Higher RPM only seemed to drain the battery faster. After turning on the headlights, opening the sunroof and windows, and turning on the A/C on full (There was not enough power for the radio), it had dropped to about 7V, the gauges were failing, and the idle became rough. It stalled about 30 seconds later when I tried to close the windows. There was not enough power to crank the engine, it read 12.0V. I managed to start it again a few minutes later, turned on the headlights and A/C, it stalled faster, and did not start again. I will change the alternator in a few hours, and see if that helps.
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Old 06-05-2022, 08:53 PM   #76
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Default Re: 1999 SOCH auto transmission problems

I suggest you check the alt before throwing another one at it. Read voltage at the alt output stud on the back-side of the alt. The stud is about 1/4" diameter and has a single wire (maybe RED) connected to it. That wire is both a conductor and fuse, and may have blown.
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Old 06-06-2022, 10:20 PM   #77
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Default Re: 1999 SOCH auto transmission problems

There was nothing wrong with any of the wires. I do believe that I know why the alternator failed. It was the dirtiest alternator that I have ever seen, caked in grease, and the vent slots were tangled, and clogged with pieces of debris that I think came off of the insilation, which was disintegrating. I removed all the insilation, replaced the alternator with one that I already had, and it no longer seems to be dying. P0733 is once again the only error code detected.
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Old 06-16-2022, 11:33 PM   #78
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Default Re: 1999 SOCH auto transmission problems

The saturn is now registered and legal to drive. I got it up to 45 MPH. While maintaining 35MPH, the engine seems to go about 2900-3000 RPM, but at exactly 40 under the same conditions, the RPM drops to about 1500. Slow down a little bit, and it goes back to 3000. I also noticed that it seemed to be shifting a bit hard while accelerating.
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Old 06-17-2022, 12:07 AM   #79
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Default Re: 1999 SOCH auto transmission problems

I have also noticed that I feel a "click" through the steering wheel when I drive over a moderately sized bump or pothole, and there seems to be about 2 inches of play in the steering wheel (from turning one direction to the other) before it even connects with the wheels, at which point I feel a light "click" through the floor on my left foot. There does not seem to be any play in the tie rods when pushing the wheels with the car on jack stands, The wheels turn together, and seem connected with each other, but I believe that I can feel a "click" as the steering wheel begins to turn with the wheels.
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Old 06-17-2022, 04:11 AM   #80
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Default Re: 1999 SOCH auto transmission problems

I drove it again, went up to highway speeds, and other speeds, and I recorded it...https://youtu.be/3mAOIono2xw
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