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95 850 Turbo fuel trim, or alternative to.

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

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Nick777
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Year and Model: 1995 850
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Nick777

95 850 Turbo fuel trim, or alternative to.

Post by Nick777 » Tue Nov 12, 2019 1:20 pm

My 95 850 Turbo has an OBD2 port under the coin tray as well as the old Im guessing OBD1 system under the hood. I've recently learned the diagnostic merits of using fuel trims to narrow down issues, so I'd like to throw out a couple of questions:

1) even though there's an OBD2 port on my 95, is it fully OBD2 - will it display fuel trims if i connect it to an appropriate scan tool (i dont own one or I'd have tried it)?

2) alternatively, i do have a handheld oscilloscope (Hantek 2D82). Can i connect it to my front O2 sensor and use that O2 signal pattern as an alternative to reading fuel trims (the voltage waveform directly from the O2 should show whether its running rich, lean, or neither)?



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greg850r
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greg850r

Re: 95 850 Turbo fuel trim, or alternative to.

Post by greg850r » Thu Nov 14, 2019 11:38 am

I would plug in to the OBD2 port and try to read them. If it's there it probably works.


05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

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erikv11
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Year and Model: 850, S/V70, 06 S60R
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erikv11

Re: 95 850 Turbo fuel trim, or alternative to.

Post by erikv11 » Thu Nov 14, 2019 2:29 pm

Nick777 wrote:
Tue Nov 12, 2019 1:20 pm
My 95 850 Turbo has an OBD2 port under the coin tray as well as the old Im guessing OBD1 system under the hood. I've recently learned the diagnostic merits of using fuel trims to narrow down issues, so I'd like to throw out a couple of questions:

1) even though there's an OBD2 port on my 95, is it fully OBD2 - will it display fuel trims if i connect it to an appropriate scan tool (i dont own one or I'd have tried it)?
Yes, it is fully OBD2.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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