Hello,
My name is Catie and i'm new the Volvo forum. I have a few questions that I can't seem to find an answer for. Before replacing my O2 sensor, my car would make a pumping sound in the back when power has been engaged. I know this is my fuel pump running, but after replacing the sensor i could no longer hear it running in the back. It now makes a soft humming sound in the front. Is this something I should be worried about? My 850 starts and runs just fine with no stalls and idles at a low rpm. There is no sent of fuel burning rich either. I have never replaced an O2 sensor till now and this is the first Volvo I have ever owned. I'm very curious to know why the sound had changed after replacement of my O2 sensor. Please help me!
97 850 02 Sensor Replacement
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Ben850
- Posts: 1613
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- Year and Model: 1996 850 R Wagon
- Location: Michigan
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Hello Catie, and welcome.
The humming in the front would usually be the ICV, or idle control valve while it is searching for position. It is a good thing.
The humming in the front would usually be the ICV, or idle control valve while it is searching for position. It is a good thing.
1993 850 GLT , You wouldn't know it.
1996 850 Turbo Wagon White.
1995 T-5R Black. New work in progress.
1998 V70 XC Cross Country White.
1994 850 N/A Wagon Black.
1997 850 Sedan Black.
1996 850R Wagon White.
1997 850 Sedan Red ( not white or black!)
1996 850 Turbo Wagon White.
1995 T-5R Black. New work in progress.
1998 V70 XC Cross Country White.
1994 850 N/A Wagon Black.
1997 850 Sedan Black.
1996 850R Wagon White.
1997 850 Sedan Red ( not white or black!)
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misha
- Posts: 5379
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Hi Catie & welcome to MVS!McBudz wrote:...Before replacing my O2 sensor, my car would make a pumping sound in the back when power has been engaged. I know this is my fuel pump running, but after replacing the sensor i could no longer hear it running in the back. It now makes a soft humming sound in the front. Is this something I should be worried about?
O2 sensor replacement have nothing to do with fuel pump noise.I guess that was only coincidence.
But...you should know that the very noisy oem pump(in 95%)will fail soon.The noise is some kind of warning.
'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
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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abscate
- MVS Moderator
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Could you have filled the tank after your O2 sensor work?
Persons with good hearing can hear the pump noise change as the fuel covers up the pump.
ICV = "I'm Caties Volvo"
Persons with good hearing can hear the pump noise change as the fuel covers up the pump.
ICV = "I'm Caties Volvo"
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
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Ben850
- Posts: 1613
- Joined: 8 September 2011
- Year and Model: 1996 850 R Wagon
- Location: Michigan
- Been thanked: 7 times
ICV = "I'm Caties Volvo"
You continue to crack me up Steve.
You continue to crack me up Steve.
1993 850 GLT , You wouldn't know it.
1996 850 Turbo Wagon White.
1995 T-5R Black. New work in progress.
1998 V70 XC Cross Country White.
1994 850 N/A Wagon Black.
1997 850 Sedan Black.
1996 850R Wagon White.
1997 850 Sedan Red ( not white or black!)
1996 850 Turbo Wagon White.
1995 T-5R Black. New work in progress.
1998 V70 XC Cross Country White.
1994 850 N/A Wagon Black.
1997 850 Sedan Black.
1996 850R Wagon White.
1997 850 Sedan Red ( not white or black!)
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