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Old 12-15-2017, 10:52 AM   #1
SRGW
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1995 SL1
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Post Need transmission advice!

Need some advice. 1995 SL1 233,000. Transmission very intermittently will not shift into 3rd only when hot [after 2 to 3 hrs. running constantly in stop and go traffic.
A little history.
Aug.2014 Had loose input shaft nut cleaned ,loctite and torque to 111 FT.LBS. Replaced line pressure solenoid with good used one, reverse restored and still OK. Aug.2017 Replaced 3rd.gear solenoid purchased from Ken Partin and changed transmission filter[wix] and fluid[Walmart Dexron III. Is it possible that the Input Speed sensor or the Output Speed sensor is failing under a heat condition? Yesterday I was out for about 4 hours going to a few stores re:stop and go and shut off car startup 20 mins later. On the way home the lockup occured and an ses light came on. I pulled over and shut off the car and restarted, the light stayed out and shifting was normal. Since this is so intermittent and it is now winter in N.J. I can live with it till spring. Need you advice and knowledge.

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SRGW
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Old 12-15-2017, 01:26 PM   #2
billr
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Default Re: Need transmission advice!

Clarify what you mean by "lockup occurred", that is the only current symptom I am reading in the latest post. Did the TCC stay locked so that the engine stalled when you came to a stop?

Oh, the VSS or TSS could fail when hot, or in any number of other conditions. Do you have any trans codes set?

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Old 12-15-2017, 03:06 PM   #3
SRGW
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Post Re: Need transmission advice!

Lockup meaning stuck in 2nd. gear and would not shift to 3rd. Checked a few weeks ago no codes in memory. Also this is my 1995 SL1 and it is OBD1.

SRGW
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1997 SL1 63,053 Just A Teenager!!
CHECK YOUR OIL!!

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Old 12-15-2017, 04:52 PM   #4
Chazberry
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Default Re: Need transmission advice!

Quote:
Originally Posted by SRGW View Post
[B]Lockup meaning stuck in 2nd. gear and would not shift to 3rd. Checked a few weeks ago no codes in memory. Also this is my 1995 SL1 and it is OBD1.
I'm thinking 2 possibilities : 1) 2nd Gear Solenoid is not getting energized. (That would probably set a code.) 2) 3rd Gear Solenoid stuck closed. Solenoid is de-energized for 3rd - it's a normally open valve. (Might not set a code.)

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Old 12-15-2017, 08:48 PM   #5
billr
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Default Re: Need transmission advice!

Maybe the range switch? But that, too, should set a code. This being intermittent and OBD1, it is going to be a chore to track down.

OP, where are you located?

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Old 12-15-2017, 09:18 PM   #6
SRGW
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Post Re: Need transmission advice!

Northern New Jersey 15 miles from the George Washington Bridge. I was thinking Input Shaft Sensor as I don't have any speedometer problems ruling out VSS.

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Old 12-15-2017, 10:16 PM   #7
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Default Re: Need transmission advice!

The input shaft sensor (I call it the turbine speed sensor, TSS) is the exact same P/N as the VSS, so you could swap them and see how the symptoms change. Those are fairly easy to R & R.

Sorry, you are way too far away from my OBD1 live-data reader in Calif...

Ha, I see you are in NJ. That's where my freebie Snap-On MT 2500 came from!

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Old 12-16-2017, 07:42 AM   #8
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Default Re: Need transmission advice!

I had a faulty solenoid that showed ok on electrical resistance readings but it's actuator portion of the unit was loose and it caused grief on my car. When I removed it, the physical end of it could be pulled apart by a few millimetres. I would take you valve body apart and physically inspect the 3rd gear solenoid even though it's resistance may show normal. You need 3rd gear more that 4th, just swap them around and see if the issue follows. If that is ok you need to determine if the transmission or the engine commuter is causing the issue.
Skin the insulation back enough on wire to the 3rd gear solenoid just enough to attached another wire to it and extend it back into the cabin and then attach a voltmeter to it. Tape the connections up so they don't short out. Use a digital volt meter which has a high impedance. With the positive lead on your "extended" wire and the negative lead on a know good metallic ground in the cabin, watch the voltmeter and see if the engine computer is trying to activate the 3rd gear solenoid when the 3rd gear shift should take place. Don't cut the wire, just carefully skin the insulation back. The engine computer is usually pretty reliable but a solid state device like a transistor is used in the engine computer to open and close the transmission solenoids, those transistors they can act up with heat. I would expect an engine computer for that age of car is decently priced. There are diagrams on this site to show you which wire on the top of the transmission to skin back, you will have to search for them. If the engine computer is trying to activate the solenoid, you will see a voltage change on the meter at the shift point. By doing this you will rule out the engine computer versus the actual transmission. I can't remember the voltage change but it's noticeable on the meter when the car calls for 3rd gear. As another person stated, the 2nd gear solenoid could be sticking. Repeat the same above to it. If I don't reply to this, don't panic, I will be out for the rest of the weekend. Glen

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