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  #1  
Old 06-29-2021, 06:15 PM
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Huskymaniac Huskymaniac is offline
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Need help on transmission diagnosis

No noticeable symptoms until today. Drove to Harbor Freight and all was fine. Got back out and went to back out of my parking space and noticed the first strange effect. Car just stopped while going in reverse. Gave it a little gas and is started moving again. Shifted into "3" and the car moved but was sluggish and the RPMs were high. Felt a little like it was starting in second gear. Continued to happen at every stop on the way home. Also, I never felt the car upshift. I may have missed it but I got it up to a good speed and let off the throttle and nothing would change, gear-wise, that I could tell. Checked the fluid and it is a very light and clean pink and the level seems good. There are no noticeable leaks that I can see. Looks clean underneath.
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #2  
Old 06-29-2021, 11:53 PM
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Re: Need help on transmission diagnosis

Tony, FIRST check the line pressure and make sure this is done properly as per the official manual.
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  #3  
Old 06-30-2021, 06:32 AM
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Re: Need help on transmission diagnosis

Quote:
Originally Posted by Trevor View Post
Tony, FIRST check the line pressure and make sure this is done properly as per the official manual.
Thanks Trevor. I will need to bring it to my mechanic for that. Do you think a short drive in 2nd gear is OK or should I get it towed?
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #4  
Old 06-30-2021, 10:13 AM
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Re: Need help on transmission diagnosis

Update:

Car sat overnight and I took it for a quick drive this morning. Temp this morning was about 80F or 27C. When I observed the bad behavior yesterday, temp was about 95F or 35C.

Car ran fine! WTH?!?! No CEL so I don't think the tranny overheated yesterday. So I am guessing one of: sticky solenoid, bad electrical connection, bad TCU or bad TPS.

I don't know how the TPS could cause what I experienced but I do know it is going bad and needs to be replaced. The car was already scheduled for inspection Friday so I will have them check the line pressure as well.
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything

Last edited by svxcess; 06-30-2021 at 10:31 AM.
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  #5  
Old 06-30-2021, 10:46 AM
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Re: Need help on transmission diagnosis

Here is the long awaited TPS solution

https://speedyefi.com/product/tps-ad...VvpUpxx-LZfH8U
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  #6  
Old 06-30-2021, 11:00 AM
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Re: Need help on transmission diagnosis

More info:

Still no CEL BUT P1702 code is stored in the ECU per my OBD2 code reader.

I read the transmission service manual and it could very well have been stuck in 3rd, not 2nd, yesterday. That would point to a solenoid 1 or 2 issue and it being put into limp mode. Or, it could be a TCU issue.

Anyone have an OBD2 TCU?
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything

Last edited by Huskymaniac; 06-30-2021 at 01:33 PM.
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  #7  
Old 06-30-2021, 02:32 PM
Blacky Blacky is offline
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Re: Need help on transmission diagnosis

Quote:
Originally Posted by svxcess View Post
Here is the long awaited TPS solution

https://speedyefi.com/product/tps-ad...VvpUpxx-LZfH8U
Wow! That's fantastic. I'm pretty sure mine is worn out. At exactly 80 kph the tranny hunts up and down between OD and drive, TC lock/unlock.. If I speed up or slow down it doesn't do it.
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Last edited by Blacky; 07-01-2021 at 12:05 PM.
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  #8  
Old 06-30-2021, 02:35 PM
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Re: Need help on transmission diagnosis

Quote:
Originally Posted by Blacky View Post
Wow! That's fantastic. I'm pretty sure mine is worn out. At exactly 80 kph the tranny hunts up and down between OD and drive. If I speed up or slow down it doesn't do it.
Are you talking about TC lock and unlock? That's what mine is doing and, yeah, I have been assuming a worn TPS. I have the one I got in the junkyard that I am hoping will last a while.
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Tony

1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #9  
Old 06-30-2021, 02:39 PM
Blacky Blacky is offline
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Re: Need help on transmission diagnosis

Quote:
Originally Posted by Huskymaniac View Post
Are you talking about TC lock and unlock? That's what mine is doing and, yeah, I have been assuming a worn TPS. I have the one I got in the junkyard that I am hoping will last a while.
Yes exactly. It's been doing it for a very long time. I should try adjusting it.
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  #10  
Old 06-30-2021, 03:16 PM
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Re: Need help on transmission diagnosis

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Originally Posted by Blacky View Post
Yes exactly. It's been doing it for a very long time. I should try adjusting it.
Nah, just replace it. You know it is worn.
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #11  
Old 07-01-2021, 06:26 AM
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Re: Need help on transmission diagnosis

Quote:
Originally Posted by Blacky View Post
At exactly 80 kph the tranny hunts up and down between OD and drive. If I speed up or slow down it doesn't do it.
Mine has always had that feel circa 90 kph. Have always assumed it was the torque converter locking & unlocking.
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