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2000 S70 GLT Turbo MAF, Throttle, Stalling, no power, not all the time

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

kfborn
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Year and Model: 2000 S70 GLT Turbo
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kfborn

2000 S70 GLT Turbo MAF, Throttle, Stalling, no power, not all the time

Post by kfborn » Fri Apr 12, 2019 5:26 am

I have a 2000 S70 I bought used and i love the car but started having some issues. These problems dont happen all the time, they seem to start when im driving short local trips and the car is warmed up. The RPMs will flutter and car may stall, has a problem starting and when i hit the gas pedal there is hardly any response. I have to let it sit and then it will start. I have to play with the gas pedal to get the rpms up enough to pull away, if I can do that and get it moving it usually stops. It was throwing codes for the MAF which i replaced with no change. I decided to check the spark plugs. the first few had a lot of oil in them which im sure isnt a good sign. It almost seems like theres a vacuum leak. In my research i keep coming back to throttle body ETM issues. The car is great when it runs well and I only paid 500 bucks for the car. The previous owner seemed to take good care of it . It has 195,000 miles. The one thing i noticed was the previous owner had the radiator replaced twice within a couple of years. Im sure theres more then one issue but I was thinking my next move would be to clean the throttle body and replace the sensor. Any comments or thoughts will be appreciated. Keep in mind i do not have the money to go to a mechanic and I usually get my replacements parts on line or a wrecking yard.



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abscate
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abscate

Re: 2000 S70 GLT Turbo MAF, Throttle, Stalling, no power, not all the time

Post by abscate » Fri Apr 12, 2019 8:55 am

welcome to MVS

If the ETS light is out on the dash, (make sure it lights up on key on) the throttle body probably still has some life left in it.

If it has a white label on it, its probably original and near end of life.

Any induction leak that lets unmetered air between the MAF and cylinder will give really poor running.


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erikv11
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erikv11

Re: 2000 S70 GLT Turbo MAF, Throttle, Stalling, no power, not all the time

Post by erikv11 » Fri Apr 12, 2019 10:05 am

This is a bit of a long shot but: what brand replacement MAF did you put in?


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 205k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 275k
'06 S60 R, 155k
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wizechatmgr
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wizechatmgr

Re: 2000 S70 GLT Turbo MAF, Throttle, Stalling, no power, not all the time

Post by wizechatmgr » Fri Apr 12, 2019 9:30 pm

Check and verify voltage at battery while running. If you're down under 12 volts (not sure how far down, didn't have a multimeter at the time) then the car will do exactly as you describe until it ultimately dies. Voltage at battery ideally should be ~13.5V with engine running.

In my case the alternator went, taking my headlight bulbs with it. A couple months later the battery decided to peace out.


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1999 V70 XC AWD - ~175k miles

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abscate
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abscate

Re: 2000 S70 GLT Turbo MAF, Throttle, Stalling, no power, not all the time

Post by abscate » Sat Apr 13, 2019 4:11 am

Oil in the plugs isn’t serious. These cars seep oil from the top and it just works it’s way down to the plug holes. If they are wet don’t worry about it for now. If the holes are full of oil, that’s problem. Black rings and reside at bottom are normal.


1 SWMBO for 30 years
2 Volvos
3 VWs
4 Careers
5 cats/dogs/gears
6 Perfect Ladies in waiting
7 Drivers
8 Boats- with a big pointy metal thing on top

1999 V70 T5M 56 2005 V70 NA M56 VWs BMW

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