Question about 1995 Buick Park Avenue

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Car runs great and shifts right until I drive it on longer trips. When I have driven about 40 miles it will drop out of overdrive and go into 3rd gear, it seems to shift fine after that but will not shift up into overdrive. If I shut it off and restart it then everything is fine and it shifts up into overdrive just fine again! Any ideas?

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  • Windrider883 Jul 26, 2012

    Mine does the same thing, I am tracking it down to a loose broken wire on the transmission plug in, I also found that a good proper tune up will greatly help also.

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  • 182 Answers

Shift solenoid bad

Posted on Sep 06, 2010

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Hello. My name is Toyota Ed. Please allow me to assist you.

The truth is, your Paseo is working properly.

To lessen emissions, Toyota does not allow the overdrive to engage until the engine temperature reaches 177 degrees F.

The "OD allowed" temperature is determined by the coolant temperature sensor on the engine. This sensor prevents the computer from allowing the OD to engage until the 177 degree threshold is met.The warmer the coolant is, like in the summer, the faster the 177 degree plateau is reached. In colder temps, like in winter, it takes much longer for the coolant to warm up to the desired temperature, thusly taking longer to shift into OD.

If the overdrive engaged before 177, cold-engine emissions are more abundant.

There is nothing that can be done to change the point at when the OD is permitted to shift.

So, your car is in excellent working condition. Nothing to worry about, now that you understand the basic design.

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