Got me an Acura TL 04 with a some what of an annoying problem;
Automatic

When driving shifting is completely normal. 1ST to 2ND to 3RD to 4TH & to 5TH all fine. Down shifting is fine as well no sudden jerks or anything that's out of the ordinary. However; When down shifting from 2ND to 1ST & accelerating, like you slow rolled a signal light that was red & just turned green, it slips into neutral, I assume neutral, and just revs up. If accelerator held long enough it will SLAM into 2ND gear. Only way around this for me is to stop completely & or let off the gas and slap it into manual" mode & go into 2ND gear whilst it's going down RPM.
Like I said transmission shifting fine going up and down to a stop. No idea what could be the issue. No check engine light, no code, nothing what so ever on the dash. Checked for leaks & all is well. I did change the oil and added Lucas just incase but that did nothing.
- I have no back story to most of this car other than about a year ago transmission was rebuilt for the same reason yet it did not fix the problem.

Any tips & or help would be appreciated!

 

yeah, whatever you're doing to cause it to slip is bad.. dont do that. try not to "slow roll", as it's slipping...which you're confusing it as neutral. it's slipping and not catching 2nd gear until it slams. if you keep doing that, you will have to rebuild the tranny or install a new one, pretty quickly.

 

^
I agree with justnspace! I would discourage that particular automatic transmission 2nd to 1st downshifting technique.

This thread reminds me of the thread below where the OP asked if his automatic transmission rev matching downshifting 'fun time' would damage his 2G tranny, lol.

https://acurazine.com/forums/second-...shifts-990013/

 

Yeah I stopped doing that while back with the high rev & slam once I noticed it happen a few times. There's cases where say traffic speeds up then slows down; Kind of what I mean by a slow stop. Just at a start to 1st to 2nd and slow down back to 1st and then speed up to 2nd; That speeding up into second is when it slips. Normally it shouldn't be an issue. I have 3 other vehicles that do switch in those situations automatically. Any idea on what that could be making it slip?

 

Oh jeez! I wouldn't do those kind of thing that funtime" Is doing. This is just normal drive. No hard play. The high rev would just be normal accelerating until I noticed it wouldn't catch into second. I've learn to let go LOL

 

I can tell this isn't normal for a transmission. I will try to explain better with a scenario but with more detail just incase that it might not sound right.

Just say you are coming to a red light, damn near about to stop & the light turns green. While you are still moving you see the light turn green and you push the gas. Right at that moment of when the gas is pressed it slips while the car was about to stop for the red light. Normally you wouldn't stop when the light turns green if no one is infront of you unless they were stopped.
In another instance say the light stayed red and you stopped the car. The light turns green. You press the gas and it switches normally with no problems.
Hopefully that would help a bit on what I am trying to explain.

 

Normal questions about transmission maintenance should be coming up.....what condition is the fluid? When was it changed last? How many miles? Have you done any other preventive maintenance on the transmission like switches?

 

right, the transmission is hurting.
the clutch packs inside the transmission case are slipping, specifically 1-2 gear shift.

perhaps the fluid is worn out. perhaps you need to change the fluid on the regular to always have fresh fluid in the transmission. heat destroys the fluids properties and allows slippage.
you will need to avoid this 1-2 shift as much as possible...or it will quickly destroy the clutch packs.
change the fluid and change the 1-2 pressure sensors.
hopefully this will alleviate said problems....if it doesnt, you'll need to rebuild the tranny or swap in an AV6 (honda accord) transmission

 

sounds like an issue with the valve body in the trans or clutch pack. If you go back to the rebuild shop they might be able to help, I like to use the rebuild kits from sonaxx

 

Month ago. Still had the red look but can smell it was awful. Now its all cherry red and fresh! Not even 2k on it. 215k miles total on the vehicle but don't know when last time the oil for tranny was changed prior from my change. Have not messed with switches/sensors.

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I will try the pressure switch and see. New oil in it so I know I can rule that out. If the sensor does not work I might just have to swap. Trying to NOT go deep in the hole unless I know for sure I personally cannot fix!
I appreciate the tip. Can't go wrong on changing a sensor. Will update!

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Someone at my work said something about a valvebody. I will try the sensor justnspace suggested & if that doesn't work WELL~ Either swap or rebuild or get it rebuilt. I have no idea on who rebuilt it before & seems like they didn't do the job last time. Who rebuilt it last time was supposedly supposed to have fix the same issue I am describing. LOL maybe the seller lied. Who knows.

I appreciate the help fellas. If anything else could be an issue please let me know!
Will update.

 

Didn't find 1 - 2 pressure sensor. Seen 3 - 4. However there's a diagram with valve A B C & D. Is it one of those?

 

UPDATE
Been a hot minute. I've changed A & B (1 - 2) sensors justnspace suggested and it did work!
However it's unknown howlong this transmission has been dealing with the constant slip'n'slamming" into gear prior from when I've purchased it; there seems to be alot of play. Slipping is no longer a real issue. Yes it does BRIEFLY slip from first to second on a roll it no longer stays slipping. It does however continue to slam" ever so slightly into gear so I believe there's internal damage to be assessed in the future. I will continue to be smooth with this puppy until failure is assured. Now I don't have to worry so much about those rolls if they do happen. I appreciate the help fellas!
Thank you!

TIP
Starter will get in the way of one of the solenoids. Pull it almost out and you will have enough room. Or take it out completely.

 

Having the same problem how has it been some so far