I installed a new idle air control valve hoping to fix it..both old valve and new check out fine. Anyways I can plug the idle air control valve in when the car is cold and it won't let me put it in reverse or drive without stalling..park and neutral I get a steady 1000 Rpms..when warm I can feather the gas and take off but not when cold. When slowing to a light I can stop and a second later the Rpms drop to zero.
Now with the idle air control valve disconnected it'll die from cold at idle in park or neutral until warmed up and then I can drive it normally but gas mileage suffers. So I usually warm it up with the iac plugged in and unplug it when warmed up..or else I keep the iac plugged in and throw it into neutral at every stoplight.
I'm thinking a sensor..maybe the temp sensor located under the thermostat..but not sure..gonna test it when cold and warm tomorrow. It's getting cold here in Ohio and it takes awhile to warm this thing up..thanks!
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850 stalls when slowing down to a light or in gear except when I disconnect the iac
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- Posts: 3
- Joined: Wed Nov 04, 2015 8:59 am
- Year and Model: 850 t5 1997
- Location: Wixom, michigan
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- RickHaleParker
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- Year and Model: See Signature below.
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Re: 850 stalls when slowing down to a light or in gear except when I disconnect the iac
Leaks in the Air Intake.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold
- misha
- Posts: 4018
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- Year and Model: '97 850 2.5 20v
- Location: Serbia
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Re: 850 stalls when slowing down to a light or in gear except when I disconnect the iac
+1.
If it idles with iac disconnected it pulls air from somewhere else.
When iac is connected it have more air than needed and this choke the engine.
If it idles with iac disconnected it pulls air from somewhere else.
When iac is connected it have more air than needed and this choke the engine.
'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
'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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- Joined: Wed Nov 04, 2015 8:59 am
- Year and Model: 850 t5 1997
- Location: Wixom, michigan
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Re: 850 stalls when slowing down to a light or in gear except when I disconnect the iac
Vacuum guage has never changed..always showed 19 at idle. I will try to spray the engine with choke cleaner hoping for a raise in idle.
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Re: 850 stalls when slowing down to a light or in gear except when I disconnect the iac
You'll want to check for unmetered air - so anything after the MAF. Check ALL of the intake hosing and associated clamps, you might need to smoke test the intercooler if you have a turbo setup.
current - 98 S70 T5 SE (255k km)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)
- greg850r
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Re: 850 stalls when slowing down to a light or in gear except when I disconnect the iac
Order silicone lines and replace every vacuum line you can find. If they don't solve this problem it will head off your next one.
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
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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