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2000 S70 Still runs poorly after Xemodex upgrade

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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E Showell
Posts: 3275
Joined: 16 October 2008
Year and Model: ‘07 S80 3.2
Location: Long Valley, N.J.
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Re: 2000 S70 Still runs poorly after Xemodex upgrade

Post by E Showell »

Make sure they weren't both by me. . .
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT
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Chapelgirl
Posts: 27
Joined: 28 January 2011
Year and Model: 2000 S70 2.4l N/A
Location: Virginia

Post by Chapelgirl »

Seems the coolant temp sensor is normal. Tested over 1000 ohms cold and around 268 when warm. Gauge reads normal directly at 3 o'clock when warm as it always has.
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Chapelgirl
Posts: 27
Joined: 28 January 2011
Year and Model: 2000 S70 2.4l N/A
Location: Virginia

Post by Chapelgirl »

Thinking back to when this started it was after the Seafoam treatment. Anyone ever had trouble after doing the Seafoam?
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misha
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Year and Model: '97 850 2.5 20v
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Post by misha »

Chapelgirl wrote:...Cooling fan runs longer than normal when the car is shut off even on a cold day and especially after struggling up the hill on the way to my house. .
This indicates that ect sensor is bad.

They don't run long and you can barely hear them even on a really hot day and they always turns off after the engine is turned off.

I suggest a new thermostat(Wahler or Vernet) and OEM ect sensor,not aftermarket one.
'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
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Chapelgirl
Posts: 27
Joined: 28 January 2011
Year and Model: 2000 S70 2.4l N/A
Location: Virginia

Post by Chapelgirl »

Ok. Going after the ECT. From what I
m reading that could explain why my fuel mileage has dropped way down below 10 mpg at times and why the car runs so poorly. When I tested the sensor with my meter I read over 1000 ohms when cold but only momentarily and it would drop back to 1 on the meter which I guess means an open circuit. I tested it multiple times and every time it would flash something well over 1000 just for an instant and drop back to
1 on the meter. After warming the engine up I read something in the 200`s but would read steady. My dash gauge has been steady though. Maybe this conflicting signal has been confusing the ECU. Will purchase an OEM sensor and replace and report back. Thanks for the suggestion.
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precopster
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Post by precopster »

I have a 2000 V70 (with Denso mamagement) which runs the cooling fan often for 4-5 minutes after engine shut-off and gives great mileage and has a new ECT (less than 60k kilometres and aftermarket) Our Siemens managed 850 10 valve did the same thing on an OEM ECT. So that's not really a clue. Perhaps on a Bosch car????

However if your readings are not within spec absolutely go for the ECT as the culprit. :roll:
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design
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misha
Posts: 5379
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Year and Model: '97 850 2.5 20v
Location: Serbia
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Post by misha »

On my car cooling fans NEVER continue to run after turning off the engine.
'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
Top
User avatar
E Showell
Posts: 3275
Joined: 16 October 2008
Year and Model: ‘07 S80 3.2
Location: Long Valley, N.J.
Has thanked: 37 times
Been thanked: 111 times

Post by E Showell »

The only time mine continued to run was when the ECT was bad.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT
Top
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