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1992 Toyota Supra automatic transmission

Tiny
RHONE27
  • MEMBER
  • 1992 TOYOTA SUPRA
  • 180,000 MILES
There are a couple of things wrong here with shifting. One the car revs high upon shifting. Two the car shifts between 5-13mpg over its targeted points after second gear(Depending on how fast the car is accelerating). Next is at 40-50mph the car lets out a high pitch whistle as if air is being push through a needle pin size hole.
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Friday, August 9th, 2013 AT 5:50 PM

11 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
I would sugggest starting with checking for trouble codes. Is the OD light blinking when in operations?
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Saturday, August 10th, 2013 AT 5:27 AM
Tiny
RHONE27
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  • 6 POSTS
No O/D light is fine as far as I know. I drive with the O/D on as instructed by owners guide. I just recently fixed a check engine problem mass air flow). Everything was fine after that. The car did sit up for an extensive period of time before drive old enough to drive. I was told to do a maintenance check before I start thinking "big bucks".
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Saturday, August 10th, 2013 AT 7:00 AM
Tiny
KHLOW2008
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If the vehicle had been idle for an extended period of time, one or more of the solenoids could be sticking and I would suggest giving the vehicle some running around and have the fliuds replaced if the condition is not too good.
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Saturday, August 10th, 2013 AT 7:17 AM
Tiny
RHONE27
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  • 6 POSTS
I've been driving it around. It had 174500 approx miles when I started driving everyday. But make sure I'm undernding replace the fluids/filter and drive around to lubricate those solenoids and hope that fixes
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Saturday, August 10th, 2013 AT 7:37 AM
Tiny
KHLOW2008
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Filter is maintenance free strainer and if it is badly clogged, that could mean trouble.
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Saturday, August 10th, 2013 AT 8:23 AM
Tiny
RHONE27
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  • 6 POSTS
Ok my next question is does the transmission have a modulator
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Saturday, August 10th, 2013 AT 11:58 PM
Tiny
KHLOW2008
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It depends on what you mean by modulator.

The controls for pressure lines are done by the valve body which are controlled by the engine computer sctivating and deactivating some shift solenoids.
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Sunday, August 11th, 2013 AT 12:06 AM
Tiny
RHONE27
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  • 6 POSTS
Also my transmission fluid is no longer the red color it is suppose to be, it is brown. Doesn't that mean my transmission experienced heat or just age.
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Sunday, August 11th, 2013 AT 12:08 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If it is brown but clear, it is aged but it it brown and is similar to chocolate, its condition has badly deteriorated.

Heat would turn the fluids dark, with a tinge of black.
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Sunday, August 11th, 2013 AT 12:13 AM
Tiny
RHONE27
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I'm not sure what I mean by modulator. I was told tthat automatic transmission have them and when I think to maintenance it replace that as well.
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Sunday, August 11th, 2013 AT 12:43 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The automatic transmission does not require much attention except for the regular fluid changes unless something has gone wrong which requires diagnostics to find out the cause.
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Sunday, August 11th, 2013 AT 1:31 AM

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