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2002 V70 NA Stalling Out Cold, runs well hot

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Mr. Detail
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2002 V70 NA Stalling Out Cold, runs well hot

Post by Mr. Detail »

Ok, here is my latest issue after replacing all five ignition coils and replacing all five spark plugs. Whenever I first start up the car in the morning, she shakes quite a bit before reaching the middle of the engine warm up gauge.
This seems to be whether it is cold outside or warm like today (60 deg.).
In fact, I thought because it was so warm out today I could just start her up and go but at the first stop sign the car just died. I re-started it several times before I could get it to move forward. Once it reached the middle of the engine temp gauge it was fine. Any thoughts why this stalling out issue is happening? No check engine light.
Thanks.
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RickHaleParker
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Re: Stalling Out

Post by RickHaleParker »

Check the resistance of the Engine Coolant Temperature (ECT) sensor against the engine coolant temperature.

15 kΩ at -20°C ( -4°F)
2.5 kΩ at 20°C (68°F) Typical room temperature.
0.3 kΩ at 80°C (176°F) This is 10 - 25°C below operating temperature*.

* OEM thermostat starts to open at 90°C (194°F), fully open at 105°C (221°F)

At 60°F the resistance should be ~2.0 - 2.5kΩ.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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abscate
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Re: Stalling Out

Post by abscate »

I just bumped the cold start rough running thread whose root cause was a really badly torched vacuum hose
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Mr. Detail
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Re: Stalling Out

Post by Mr. Detail »

RHP, would the ECT sensor really cause the engine to completely cut out like it did several times? I was dead on the road and had to put it in drive and then re-start at least four times.
Thanks abscate for the bumped thread. I will look for that now.
Mr. Detail
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Re: Stalling Out

Post by Mr. Detail »

By the way can anyone shoot me a snapshot of where the ECT sensor is?
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Re: Stalling Out

Post by abscate »

On a P2 follow the upper right radiator hose, the thick one, back towards the engine. It connects to a housing which contains the thermostat and the ECT sensor
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
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Mr. Detail
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Joined: Wed May 03, 2006 11:21 am
Year and Model: 2002 V70 N/A
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Re: Stalling Out

Post by Mr. Detail »

Thank you abscate.
On your earlier post about a "torched vacuum hose/line". Did anyone ever state which specific vacuum hose went bad?
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RickHaleParker
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Re: Stalling Out

Post by RickHaleParker »

Mr. Detail wrote: Sun Jan 12, 2020 5:29 am RHP, would the ECT sensor really cause the engine to completely cut out like it did several times?
Faulty readings from the ECT can cause the ECM to miscalculate the air-fuel mix.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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abscate
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Re: Stalling Out

Post by abscate »

Mr. Detail wrote: Sun Jan 12, 2020 10:37 am Thank you abscate.
On your earlier post about a "torched vacuum hose/line". Did anyone ever state which specific vacuum hose went bad?
I don’t think I named it , but I showed lots of pictures

:D
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
Mr. Detail
Posts: 398
Joined: Wed May 03, 2006 11:21 am
Year and Model: 2002 V70 N/A
Location: Newtown Square, Pennsylvania
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Re: Stalling Out

Post by Mr. Detail »

Is there a special socket I will need to loosen the old ECT sensor as the wire is still attached?
Not sure yet of that hex size.
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