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Q:

wont go over 40 mph & doesnt seem to shift od light on when od isnt on 1994 Volvo 940

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also have heard some hissing noise as well, what is this caused by??? Thank you for your time
(2) Answers
(2) Comments
It sounds like you have a few issues going on here.
1. Won't go over 40 mph. There are several possibilities, could be a failing fuel pump, mass airflow sensor or fuel pressure regulator, or something else. Need a proper diagnosis to determine what is causing this.
2. OD Light: Most likely the OD relay is failing, very common issue on the 940.
3. Hissing noise: noises need to be heard and an inspection performed to determine where it is coming from, otherwise it's a very wild peculation, and will always be wrong.
An experienced Volvo tech can figure these things out fairly easily, as these are fairly common complaints for this vehicle.
i have just had those same symptoms, i replaced my transmission filter first
actually i seen shavings on the filter but i replaced it anyway it helped but i had to replace the trans