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Speedo acting funny after swap. Volvo 850 '92 GLT

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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misha
Posts: 5379
Joined: 7 December 2008
Year and Model: '97 850 2.5 20v
Location: Serbia
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Re: Speedo acting funny after swap. Volvo 850 '94

Post by misha »

My reply was about mpg to l/100km with m&h buttons trick.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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koralski
Posts: 47
Joined: 13 March 2025
Year and Model: '92 850
Location: Sofia, Bulgaria
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Post by koralski »

I tried the hour/minute method. It only swaps the temperature from fahrenheit to celcius. Tried the diagnostic port method, no blinks at all at A7. What do i do?

Can an expert chime in?

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