Question about 1995 Oldsmobile Silhouette

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Over-drive not working

When the tranny fluid in my 1995 silhouette gets warm it won't stay in overdrive. If I'm in overdrive before it gets too warm, usually about 10 miles, and don't take it out, it'll stay in overdrive until I stop or have to turn or whatever I need to do when not going a long distance.

Is there a sensor of some sort that may be preventing it from going back into overdrive when the fluid warms up?

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  • gto15 Nov 06, 2008

    Hi Chris,

    Thanks for responding to my post on fixya. Would it be ok to call you to discuss the tranny problem? I also need an opinion of why this 1993 silhouette won't start. It rolls over fine but no spark and i don't know the location of the things to check.

    The tranny problem is in the 1995. I also have a 3rd one coming, 1994. Just want to take advantage of parts on 2 of them.

    Could you email me your number and the best time to call. Of all the responses on fixya, I like yours the best as it sounds like you definitely have the experience.

    Thank You,

    Randy Brooks
    gto@iowatelecom.net



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CHECK TPS SENSOR
CHECK OVERDRIVE SOLENOID

Posted on Nov 05, 2008

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Hi!
You didnot mentioned the condition of the fluid and when last it was changed.For it seems to me that u r having a fluid problem.When the fluid gets hot the pressure can't be sustain to keep the transmission in overdrive. I will like to suggest to u that u get the transmission fluid change, using the type priscribe for your vehicle(check the manufacture spects).

Posted on Nov 06, 2008

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The transmission fluid should be serviced at 80,000 km intervals on this transmission it should be scanned by computer for trouble code , if it has a code this will be a start no code on the left side of transmission vertical take cover off and replace tcc solenoid switch common problem

Posted on Nov 06, 2008

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Flushing the tranny COMPLETELY, using a flushing machine has NO negative effect on a transmission regardless of miles. Anyone who tells u that it does is clearly a person to steer clear of. Flush machines DO, infact, flush out the entire system INCLUDING the torque converter and cooler lines. Think of it this way...why would u just drop the pan, change the filter, refill with 5 or so quarts of oil, leaving a remaining 11 or 12 quarts of nasty, old fluid still in the tranny? Doesn't make sense, does it?? Changing the filter is ok and the magnet in the pan is a good indication of what's going on inside the tranny. If there are metal chunks on the magnet or excessive buildup of shavings...then you probably have worn clutches or bands. But for people to say "don't use a flushing machine"..is ridiculous. Just as ridiculous as just changing fluid and filter in the tranny. You STILL have 3 gallons of contaminated fluid in the torque converter. That's like saying "only change 2 1/2 quarts of engine oil at every oil change...retarded. I'm sure my advice will be met with considerable negativity from others, but it's based on fact and over 25 yrs of transmission experience. I've rebuilt over 1,000 trannys in my time and have NEVER simply suggested "drop the pan, change filter and refill". Altho flush machines are fairly new to the market (3 yrs or so), I have used fluid transfer machines to do the very same job. It's really simple and gaurantees ALL the fluid is changed. Good luck to u.

Chris

Posted on Nov 05, 2008

  • Chris Guyette Nov 05, 2008

    Hi.....first thing to do is check your tranny fluid.....hot and in park. There are hash marks on the dipstick that tell u where the level is ok at. Also take note of the fluid color. GOOD fluid is a transparent maroon color and u should be able to see the hash marks thru the fluid. Keep in mind that PROPER transmission fluid exchange should be done at every 30k mile interval, even if u don't tow. Flushing machines are ideal for this type of maintenance as they flush out EVERY drop of fluid, not just the pan and filter. Anyone who suggests otherwise or says further problems can arise from the use of such a flushing machine is inexperienced and their advice should not be followed. Think of it this way...your tranny has an average of 4 gallons of tranny fluid in it (including the torque converter) and all of this fluid MUST be flushed out. Why would u change only part of the fluid and leave a remaining 3 gallons or so of contaminated fluid in there? That's like only draining 1/2 your engine oil and leaving the other 1/2 in the engine. My advice......flush the tranny completely....FIRST. This will ensure all of the fluid is new. Drive the vehicle, putting it thru it's normal paces for a few days. See if things improve or not. Keep ME posted as to what's going on. I have over 25 yrs experience with transmissions. You may email me personally if u'd like. I'll provide you with my email addy if you wish. Good luck to you.



    Chris

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The problem lies in the torque converter and the one way clutch allowing it to lock up in overdrive. The fuild when cold has has enough viscosity (weight or thickness) that it allows pressure to develop. My suggestion would be to have the fuild changed NOT FLUSHED USING A MACHINE BECAUSE THIS CAN CAUSE ADDITIONAL PROBLEMS IF THE TRANSMISSION WAS NOT SERVICED REGULARLY. Simply have the garage of your choice drop the pan and change the filter and fluid. This would be the first step. If the problem is no corrected then I would look at the converter. one thing you question did not state are you showing any trouble codes? ,

Posted on Nov 05, 2008

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Hello first thing to do is check your tranny fluid color for yellow or brown wipe it on a white cloth or paper towel look for a gray residue on the cloth if not smell the fluid on the dip stick if it smells like paint thinner or burnt chances are the screen and fluid need changing what can happenis while your fluid is cold most of the debris in the tranny pan is settled as it heats up and gets thinner it gets easy for this to circulate whith the tranny fluid wich can interfere with internal solenoids and valve ports in the valve body switches etc check to see when the tranny fluid was serviced last if it hasnt mabye you should consider tell them you want the lines flushed a cleaner this usaully comes in a can that resembles fix a flat good luck please rate thanks

Posted on Nov 05, 2008

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Maybe..but most likely this is a fluid pressure problem internal..the front pump or torque converter are not keeping a minimum of PSI for the overdrive to stay engaged ...educated guess only not being able to smell or hear it in person..good luck

Posted on Nov 05, 2008

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