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855 2.5 20V permanent open loop..

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

mateuszek
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Year and Model: 855 2.5 20V 1997
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mateuszek

855 2.5 20V permanent open loop..

Post by mateuszek » Sun Apr 08, 2018 5:35 am

Hello
I'm already fighting a bit, that's why I decided to make a separate topic here.
Right to the point.
patient 850 2.5 20V 170HP 1997
Front Lambda sensor - NEW (original bosch according to No.)
Rear Lambda NEW (original bosch according to No.)

symptoms:
permanent OPEN LOOP even when engine is very hot.
The values ​​of the front lambda probe are completely weird, they change when adding gas, but they stand at idle at odd values ​​(from -1.748 to 0.334 etc.)

The other thing is that the engine works very well, nothing interrupts, does not smoke, even the lambdas light does not illuminate (but in the computer VOL-FCR it is a mistake) burning gasolin may be a little bigger, but not spectacularly ..


Please help, I do not know what to look for anymore.... no one what I know, cant help me..

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misha
Posts: 4187
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
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misha

Re: 855 2.5 20V permanent open loop..

Post by misha » Sun Apr 08, 2018 11:09 am

Did you disconnected negative battery cable after o2 sensors replacement,in order to reset fuel trim?
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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

mateuszek
Posts: 4
Joined: Sun Apr 08, 2018 5:22 am
Year and Model: 855 2.5 20V 1997
Location: Poland
Has thanked: 0
Been thanked: 0
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mateuszek

Re: 855 2.5 20V permanent open loop..

Post by mateuszek » Sun Apr 08, 2018 11:24 am

yes, I disconected battery for +- 10 minutes, and still nothing

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misha
Posts: 4187
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 54 times
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misha

Re: 855 2.5 20V permanent open loop..

Post by misha » Sun Apr 08, 2018 3:08 pm

Try to do that overnight,alowing engine to cool down and re-connect when engine is cold.
After that....drive it normaly alowing it to warm up and it should be ok.
Other than that...you might have leak at flexy pipe(between exhaust manifold and cat),vacuum leak,dirty Maf sensor,ect out of spec.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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

mateuszek
Posts: 4
Joined: Sun Apr 08, 2018 5:22 am
Year and Model: 855 2.5 20V 1997
Location: Poland
Has thanked: 0
Been thanked: 0
Poland
mateuszek

Re: 855 2.5 20V permanent open loop..

Post by mateuszek » Mon Apr 09, 2018 1:17 pm

ok, today we switch MAF sensor from my friends the same volvo, and nothing, the same problem.
But today I saw stranger thing on computer.

when the engine was a little colder (arround 70-80 degresese C) it was that:
Image

and when it was a liitle warmer:
Image

maybe is that a water temperature sensor? I know that comp display correct temperature, but who knows....

User avatar
misha
Posts: 4187
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 54 times
Been thanked: 115 times
Serbia
misha

Re: 855 2.5 20V permanent open loop..

Post by misha » Mon Apr 09, 2018 2:04 pm

Is that android app?
It could be that it is throwing wrong data.
What engine management your car have...Motronic 4.4 should be the only one in '97.
If so....you have no egr...you have sas system.
Last edited by misha on Mon Apr 09, 2018 2:09 pm, edited 2 times in total.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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

mateuszek
Posts: 4
Joined: Sun Apr 08, 2018 5:22 am
Year and Model: 855 2.5 20V 1997
Location: Poland
Has thanked: 0
Been thanked: 0
Poland
mateuszek

Re: 855 2.5 20V permanent open loop..

Post by mateuszek » Mon Apr 09, 2018 2:05 pm

no, iphone's "car scanner"

User avatar
misha
Posts: 4187
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 54 times
Been thanked: 115 times
Serbia
misha

Re: 855 2.5 20V permanent open loop..

Post by misha » Mon Apr 09, 2018 2:10 pm

It can't be trusted.
VOL FCR should be used or a good code scanner which displays live data.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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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