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940 wont upshift

1K views 4 replies 3 participants last post by  tom r 
#1 ·
My 91 940 turbo is not upshifting right. Seems every once in a while when approaching freeway speeds, the transmission fails to upshift and rpm's remain higher than normal. This only happens once in a while. Any ideas on what might be wrong here?
Thanks,
Tom
 
#4 ·
Re: 940 wont upshift (tom r)

What is the mileage on the car? And does it do it most times first thing in teh AM cold days? My 740 does this only on cold (@45-50 or less degrees) days first thing in AM start off, and always has till warmed up two mins. I live in SC so it is not very often. But it does happen.
 
#5 ·
Re: 940 wont upshift (tom r)

Seems to only happen when it's cold and then overdrive usually starts working after about 30 minutes. Fluid level is good. The car and transimision have 148k. I'm pretty sure it's the OD solenoid and intend to replace it the first chance I get.
 
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