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94' Volvo 855T P0131 after a new O2

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abscate
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Re: 94' Volvo 855T P0131 after a new O2

Post by abscate » Tue Jan 08, 2019 3:37 am

What do the Finnish think?

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Re: 94' Volvo 855T P0131 after a new O2

Post by Sommerfeldt » Tue Jan 08, 2019 6:24 am

They flog themselves in saunas. Which is generally a better idea than talking to either a Norwegian or a Swede. :D ;)

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Re: 94' Volvo 855T P0131 after a new O2

Post by henrysin44 » Wed Jan 09, 2019 1:43 am

Sommerfeldt wrote:
Tue Jan 08, 2019 2:42 am
Yes, it is worth looking into.
If your V70 ECT is telling the ECU 300 ohm, the ECU thinks the engine is at 80 degrees, even though the ECT is saying it's at 40.
They're like a Swede and Norwegian talking to eachother. The Norwegian says something is "rolig". The Swede thinks something's funny, but the Norwegian is saying something's calm. ;) :D

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:lol: true true close but not close enough, I'm going to stop by the scrapyard tomorrow and pull an 850 thermostat housing and see if it has any effect, also going to check the PCV hoses while the manifold is off maybe theyre cracked or disconnected. But if this doesn't do it I'm at a loss for ideas. But if burning oil can ruin an O2 sensor then I have more of an idea.
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Re: 94' Volvo 855T P0131 after a new O2

Post by henrysin44 » Wed Jan 09, 2019 2:16 am

Honestly this problem is starting to drive me nuts, could I really just need a new O2?

A little run down:
-Turbo has an internal oil leak? (oil in the intake manifold & intercooler).
-Runs rough when not at operating temp (1090RPM idle, rough shifts, bad MPG, sluggish)
-very quick misfire feeling under light throttle every now an then (like a blip)
-P0131
-gas and oil smell
-20-24 mpg
Black 94' Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, straight pipe, custom two-tone interior, V70R seats & rims

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Black 00' VW Jetta 1.8L Turbo - 5 speed manual, beat up, leaks all of its oil, and can make it from point A to point A-1/2.

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Re: 94' Volvo 855T P0131 after a new O2

Post by misha » Wed Jan 09, 2019 2:22 am

henrysin44 wrote:
Wed Jan 09, 2019 1:43 am
...But if burning oil can ruin an O2 sensor then I have more of an idea.
Yes it can....lifetime for a brand new o2 sensor when engine is burning oil is about what you got...around 10k miles.

On the other side...when engine is burning oil,there must be more blowby than normal.That blowbuy can fool front o2 sensor that engine is running lean,because of extra oxygen that wasn't metered by MAF....BUT sensed by front o2.
When ecu gets lean condition report from various sensors it opens injectors longer,which results in rich running condition.
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Re: 94' Volvo 855T P0131 after a new O2

Post by henrysin44 » Wed Jan 09, 2019 9:10 am

misha wrote:
Wed Jan 09, 2019 2:22 am
henrysin44 wrote:
Wed Jan 09, 2019 1:43 am
...But if burning oil can ruin an O2 sensor then I have more of an idea.
Yes it can....lifetime for a brand new o2 sensor when engine is burning oil is about what you got...around 10k miles.

On the other side...when engine is burning oil,there must be more blowby than normal.That blowbuy can fool front o2 sensor that engine is running lean,because of extra oxygen that wasn't metered by MAF....BUT sensed by front o2.
When ecu gets lean condition report from various sensors it opens injectors longer,which results in rich running condition.
Ive done a compression & leak down, all checked out great, i do have a horrific amount of oil in the intercooler piping and inside the intake manifold....could the turbocharger be causing that by leaking internally?
Black 94' Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, straight pipe, custom two-tone interior, V70R seats & rims

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Re: 94' Volvo 855T P0131 after a new O2

Post by misha » Wed Jan 09, 2019 9:30 am

If turbo is shot and leaks oil internally...that oil can foul o2 sensor....and kill it pretty soon.
'97 850 2.5 20v /fully equipped/ Motronic 4.4 / 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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Re: 94' Volvo 855T P0131 after a new O2

Post by henrysin44 » Wed Jan 09, 2019 7:38 pm

misha wrote:
Wed Jan 09, 2019 9:30 am
If turbo is shot and leaks oil internally...that oil can foul o2 sensor....and kill it pretty soon.
FCP was having a sale so got an O2 sensor cheap, if it clears the code then I'll rebuild the turbo, its got shaft play anyway. I got it last summer off a junk car due to my 15G leaking internally so I'm unsure if the build up in the intake system is from the current one or not, I doubt it though because of how much I drive daily.

I'm still going to keep the old O2 sensor and see if a gasoline soak might get it working.
Black 94' Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, straight pipe, custom two-tone interior, V70R seats & rims

Silver 00' Volvo V70 XC 2.4L Turbo - AWD winter package!

Black 00' VW Jetta 1.8L Turbo - 5 speed manual, beat up, leaks all of its oil, and can make it from point A to point A-1/2.

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Re: 94' Volvo 855T P0131 after a new O2

Post by henrysin44 » Sun Jan 13, 2019 6:15 pm

Well I've had the new O2 sensor in for a few days and so far no problems or codes! Guess oil killed the 10K O2 sensor, I've had it sitting in denatured alcohol for 2 days and the alcohol has turned black.
Black 94' Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, straight pipe, custom two-tone interior, V70R seats & rims

Silver 00' Volvo V70 XC 2.4L Turbo - AWD winter package!

Black 00' VW Jetta 1.8L Turbo - 5 speed manual, beat up, leaks all of its oil, and can make it from point A to point A-1/2.

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Re: 94' Volvo 855T P0131 after a new O2

Post by misha » Mon Jan 14, 2019 2:51 am

It turned black because of black soot and carbon from running rich condition you had.

O2 sensor can be cleaned in ultrasonic bath...BUT only once!
'97 850 2.5 20v /fully equipped/ Motronic 4.4 / 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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