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2000 s70 power/throttle issue

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

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

jfife83
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jfife83

2000 s70 power/throttle issue

Post by jfife83 » Sat Oct 26, 2019 5:19 pm

2nd owner since 85k mi...2000 s70 non turbo 227k mi currently....car is running great 25mpg local and 31mpg hwy. No leaks and no flickering lights...
The issue is random but happens almost every time its driven....seems to get power cut in half while driving...as if the 12v system is running as 6v the popping back up to 12v...or like someone is covering the throttle body with their hand and then letting go... this can happen from 0-40mph or even while cruzing at 70mph on freeway....idle quality is dead on 850rpm and never fluctuates. Any suggestions?


2000 s70na 228k mi - daughter's car
1997 850na 87k mi - daughters
inherited from little old lady

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abscate
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abscate

Re: 2000 s70 power/throttle issue

Post by abscate » Sat Oct 26, 2019 6:22 pm

The electronic throttle bodies wear out after about 150k miles so you might be due.

Not much else on the ME7 cars or DENSO that can do this. Spark plugs and coils fresh?


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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jfife83
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Joined: Sat May 28, 2011 7:21 pm
Year and Model: 97 850na, 00 s70na
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jfife83

Re: 2000 s70 power/throttle issue

Post by jfife83 » Sat Oct 26, 2019 6:34 pm

Yes...plugs and coils are good. ...no check engine codes.... could I test the TB by removing intake hose and turning key to run but not start and fluctuate the gas pedal to see variations in throttle plate?


2000 s70na 228k mi - daughter's car
1997 850na 87k mi - daughters
inherited from little old lady

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abscate
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abscate

Re: 2000 s70 power/throttle issue

Post by abscate » Sat Oct 26, 2019 7:39 pm

You really need VIDA and watch the two sensors during throttle body operation and log failures, by the time a visual shows anything, your car is in limp home mode


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

jfife83
Posts: 27
Joined: Sat May 28, 2011 7:21 pm
Year and Model: 97 850na, 00 s70na
Location: Louisville, KY
Has thanked: 1 time
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jfife83

Re: 2000 s70 power/throttle issue

Post by jfife83 » Sat Oct 26, 2019 7:42 pm

Thanks for the help...but the car never throws any code or goes into limp mode. ....it's strange


2000 s70na 228k mi - daughter's car
1997 850na 87k mi - daughters
inherited from little old lady

User avatar
abscate
MVS Moderator
Posts: 19229
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
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abscate

Re: 2000 s70 power/throttle issue

Post by abscate » Sat Oct 26, 2019 7:57 pm

That’s when VIDA shines as a diagnostic. It lets you monitor parameters so you don’t have to wait for codes.

The ETB has to have a fatal error to trip an ECU code


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

jfife83
Posts: 27
Joined: Sat May 28, 2011 7:21 pm
Year and Model: 97 850na, 00 s70na
Location: Louisville, KY
Has thanked: 1 time
Been thanked: 0
United States of America
jfife83

Re: 2000 s70 power/throttle issue

Post by jfife83 » Sat Oct 26, 2019 10:11 pm

Got it...thanks again


2000 s70na 228k mi - daughter's car
1997 850na 87k mi - daughters
inherited from little old lady

jfife83
Posts: 27
Joined: Sat May 28, 2011 7:21 pm
Year and Model: 97 850na, 00 s70na
Location: Louisville, KY
Has thanked: 1 time
Been thanked: 0
United States of America
jfife83

Re: 2000 s70 power/throttle issue

Post by jfife83 » Fri Nov 29, 2019 5:31 am

Could this be a fuel pump issue....daughter was driving...I was passenger... and it started acting up like it has no power and I could hear a clicking/ticking coming from rear of car...when the power came back normal the clicking/ticking went away


2000 s70na 228k mi - daughter's car
1997 850na 87k mi - daughters
inherited from little old lady

User avatar
abscate
MVS Moderator
Posts: 19229
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 231 times
Been thanked: 764 times
Trinidad & Tobago
abscate

Re: 2000 s70 power/throttle issue

Post by abscate » Fri Nov 29, 2019 5:54 am

Could be. The fuel pump on the 1999- is much more reliable than the -1998, but monitoringfuel pressure at the rail will tell you if there is a delivery problem. No vacuum controlled fuel pressure regulation on ME7 or DENSO cars , 1999-
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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

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