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There are numerous potential causes for the problem you are having. One thing that comes to mind is a failed engine coolant temperature sensor (https://www.yourmechanic.com/services/coolant-temperature-switch-sensor-replacement) (ETC). The ECT does exactly what it sounds like - it monitors engine temperature. The...

My guess is that the overdrive relay or solenoid has failed. If either of these parts fail, your Volvo will not shift into overdrive. This is a very common problem on Volvos such as yours. A trained professional, such as...

The EGR valve is the component that actually admits the flow of exhaust gas into the intake. The EGR vacuum controller modifies the amount of flow through the EGR valve based on the level of engine intake vacuum where the...

Most likely, the work you had done and the smoke are unrelated. Black exhaust smoke indicates a rich air fuel mixture and can be caused by problems like a leaking fuel injector or faulty engine sensor. White exhaust smoke indicates...