hey there, i have had a volvo since my first car and love them!!! Im now a proud owner of a 1994 850 T5 and had two main questions. One was my 850 has a rough idle, it runs great and has no other problem but when its idle it gets to go under and over 1k rpm constantly, anyone know why?? I was also wondering how hard it is to replace the odometer gear that comenly breaks?? thanks for all the help, hope everyones doing well.
Alex

 

I would clean the throttle body and idle motor.

For the Odometer gear check here.
https://volvoforums.com/m_83867/tm.htm

 

And other alternatives:

- ECT sensor
- MAF sensor
- Tune-up items
- etc...

Some servicing suggestions; see my 1st & 2nd replies at:
https://volvoforums.com/m_48928/tm.htm


JPN

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+1`to all the above