Do you have the owners hand book? I think it was written in there, but I may be wrong. Sorry been about 10 years since I had a 850 with that unit on it.
Neil.
850 1995 Idling up and down Topic is solved
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scot850
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Re: 850 1995 Idling up and down
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold
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manovlov
- Posts: 1180
- Joined: 6 July 2011
- Year and Model: 1995 850 GLT 2.5 170
- Location: Grenoble, France
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No comment...
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1995/02 850 GLT 2.5 170 Petrol M56
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manovlov
- Posts: 1180
- Joined: 6 July 2011
- Year and Model: 1995 850 GLT 2.5 170
- Location: Grenoble, France
- Has thanked: 620 times
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I've replaced the Idle Control Valve yesterday and things started to come to normal. But, after have waited 15 mn idling, the coolant gauge, to the top, came to the bottom and get again to the top. The ODB gives me wrong information. Approxymatly, each 5 minutes, i loose 10 km of autonomy, which is wrong. The last time i did a long trip (2 weeks ago) it was the case, but after 1/2 ho on the motorway, this information started to grow up again. May be i should drive a bit, following Misha's idea, to let the control unit retrieve its normal data.
This morning, i started the car, it got to its normal gauge level on the speedometer, but the announced consumption drops from 10 km regularly. Then engine stopped as if it was running out of air.
What i know :
- the coolant sensor is new,
- the thermostat coolant is new
- the Idle control valve is a "used" part,
- Cam pulse sensor is new,
- i'm gonna replace the throttle position sensor (BOSCH) (replaced the inside seal btw)
- The throttle bdy has been cleaned up, new paper seal,
Tracks :
- Oxygen sensors (both) ?
- Knock sensor under the intake manifold ( ground fault) ?
- Distributor cap (which have been replaced in 2019) ?
- The MAF (one is on its way with abscate help.
What is this part for ? Has it something to matter with the Idling ?
Manov
This morning, i started the car, it got to its normal gauge level on the speedometer, but the announced consumption drops from 10 km regularly. Then engine stopped as if it was running out of air.
What i know :
- the coolant sensor is new,
- the thermostat coolant is new
- the Idle control valve is a "used" part,
- Cam pulse sensor is new,
- i'm gonna replace the throttle position sensor (BOSCH) (replaced the inside seal btw)
- The throttle bdy has been cleaned up, new paper seal,
Tracks :
- Oxygen sensors (both) ?
- Knock sensor under the intake manifold ( ground fault) ?
- Distributor cap (which have been replaced in 2019) ?
- The MAF (one is on its way with abscate help.
What is this part for ? Has it something to matter with the Idling ?
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1995/02 850 GLT 2.5 170 Petrol M56
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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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Ect or it's wiring are bad.
Ect being bad...the engine ecu doesn't know what is the engine temperature and don't know how much fuel to inject and engine can stall,cut out or will not start.
Driveablility and engine running is compromised.
More-less...the symptoms you have.
'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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manovlov
- Posts: 1180
- Joined: 6 July 2011
- Year and Model: 1995 850 GLT 2.5 170
- Location: Grenoble, France
- Has thanked: 620 times
- Been thanked: 143 times
Thanks Misha. I will do a drive test tomorrow. I think that to have used a bad idle control valve may have send wrong data to the ECT. After have driven 200 miles before the new issue, everything was fine. To drive for 100 kms should bring back ECT to reason...
1995/02 850 GLT 2.5 170 Petrol M56
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misha
- Posts: 5379
- Joined: 7 December 2008
- Year and Model: '97 850 2.5 20v
- Location: Serbia
- Has thanked: 152 times
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When engine is idling...ect sends signal to ecu and then ecu sends signal to iac valve for idle speed.
Iac valve is active only when engine is at idle &
gas pedal at rest...as soon as you press the gas pedal iac valve is closed and throttle plate takes the induction of air to the engine.
TPS sensor is there to tell the ecu how much throttle plate is open(what is engine load) and ecu knows how much fuel to inject depending on engine load.
On closed loop engine gets paramaters from MAF,ECT & o2 sensors....again TPS is there to tell ecu what engine load is.
Iac valve is active only when engine is at idle &
gas pedal at rest...as soon as you press the gas pedal iac valve is closed and throttle plate takes the induction of air to the engine.
TPS sensor is there to tell the ecu how much throttle plate is open(what is engine load) and ecu knows how much fuel to inject depending on engine load.
On closed loop engine gets paramaters from MAF,ECT & o2 sensors....again TPS is there to tell ecu what engine load is.
'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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- Year and Model: 99: V70s S70s,05 V70
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Get that throttle body shiny clean , all that oil and grime should be removed!
Your MAF is slowly making it s way through our clogged Christmas mail system
Your MAF is slowly making it s way through our clogged Christmas mail system
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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abscate
- MVS Moderator
- Posts: 35310
- Joined: 17 February 2013
- Year and Model: 99: V70s S70s,05 V70
- Location: Port Jefferson Long Island NY
- Has thanked: 1506 times
- Been thanked: 3820 times
Cleared customs this morning! If you use WhatsApp,I can send you the link to tracking by phone ( or use email)
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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