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MAF Sensor

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

ferocity02
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MAF Sensor

Post by ferocity02 » Mon Jan 13, 2020 12:43 am

For my 1998 S70 I'm looking to replace the MAF sensor hoping it correct a misfire issue. I've tried just about everything else.

The OEM unit is around $300, and I read that there can be lots of issues with non-OEM brands.

Is there a cheaper alternative?

I believe the PN is 1275749.

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misha
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Re: MAF Sensor

Post by misha » Mon Jan 13, 2020 1:55 am

Bosch part# 0 280 217 107.
https://www.ebay.com/itm/Fits-Volvo-850 ... SwRD5eF5Hn

What you can try is to drive a car with MAF sensor's connector disconnected.
If it runs better without it,you found the culprit.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / 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

ferocity02
Posts: 153
Joined: Sat Oct 25, 2014 1:56 pm
Year and Model: 1998 S70 GLT
Location: Califfornia
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Re: MAF Sensor

Post by ferocity02 » Mon Jan 13, 2020 12:05 pm

misha wrote:
Mon Jan 13, 2020 1:55 am
Bosch part# 0 280 217 107.
https://www.ebay.com/itm/Fits-Volvo-850 ... SwRD5eF5Hn

What you can try is to drive a car with MAF sensor's connector disconnected.
If it runs better without it,you found the culprit.
Wouldn't it run much worse without the MAF plugged in? I've left it unplugged on accident before and it ran like dog shit, would barely idle.

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misha
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Re: MAF Sensor

Post by misha » Mon Jan 13, 2020 1:23 pm

Assuming that MAF is bad,the car will run better when it's disconnected(it's for testing purpose only).

If MAF is good and car runs good....it wil run worse when you disconnect it.

With MAF disconnected,car will go into limp mode but it would run.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / 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

rasense
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rasense

Re: MAF Sensor

Post by rasense » Mon Jan 13, 2020 1:35 pm

I believe that I have a good OEM MAF from a 98. PM me if you are interested.

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misha
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Re: MAF Sensor

Post by misha » Mon Jan 13, 2020 1:50 pm

When MAF is bad the car would ALWAYS run rich(black smoke from the exhaust followed with high unburnt fuel smell-raw fuel).
The car would run like c*ap.
The rpm would bounce up & down on idle.
Sometimes the car wouldn't even start...depending on how it fails.

But....i never heard that bad MAF would cause a misfire.
I would check ignition components(cap & rotor,spark plugs and wires),vacuum leaks,fuel pressure and fuel delivery....fuel pump relay also.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / 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

ferocity02
Posts: 153
Joined: Sat Oct 25, 2014 1:56 pm
Year and Model: 1998 S70 GLT
Location: Califfornia
Has thanked: 0
Been thanked: 8 times
United States of America
ferocity02

Re: MAF Sensor

Post by ferocity02 » Mon Jan 13, 2020 4:57 pm

misha wrote:
Mon Jan 13, 2020 1:50 pm
But....i never heard that bad MAF would cause a misfire.
I would check ignition components(cap & rotor,spark plugs and wires),vacuum leaks,fuel pressure and fuel delivery....fuel pump relay also.
I've been chasing this misfire for awhile and have replaced everything that I can think of that would cause a misfire, something I even replaced wire (e.g. the entire ignition system).

My thought was that if the MAF sensor is reporting air flow incorrectly that the engine may be receiving too much or too little fuel causing a misfire under heavy load. It's the stock sensor with 205k miles on it, I figure a new sensor would be well received either way.

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misha
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Re: MAF Sensor

Post by misha » Mon Jan 13, 2020 5:03 pm

GLT...LPT or n/a?
Ignition components replaced...oem?
Cap & rotor must be Bosch,wires Bougicord,spark plugs correctly gapped cheap copper ones or Volvo spark plugs.

If misfire occurs only on heavy load at WOT it could be the lack of fuel delivery or the engine is running lean which...again....is lack of fuel or too much air(vacuum leak).
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / 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

ferocity02
Posts: 153
Joined: Sat Oct 25, 2014 1:56 pm
Year and Model: 1998 S70 GLT
Location: Califfornia
Has thanked: 0
Been thanked: 8 times
United States of America
ferocity02

Re: MAF Sensor

Post by ferocity02 » Mon Jan 13, 2020 5:59 pm

misha wrote:
Mon Jan 13, 2020 5:03 pm
GLT...LPT or n/a?
Ignition components replaced...oem?
Cap & rotor must be Bosch,wires Bougicord,spark plugs correctly gapped cheap copper ones or Volvo spark plugs.

If misfire occurs only on heavy load at WOT it could be the lack of fuel delivery or the engine is running lean which...again....is lack of fuel or too much air(vacuum leak).
It's a GLT.
I try to only use OEM parts, so the ignition is all the good brands you listed.
I need to do a boost/leak test of the intake system and compression test. It could also be a bad injector.

User avatar
misha
Posts: 4078
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 40 times
Been thanked: 102 times
Serbia
misha

Re: MAF Sensor

Post by misha » Tue Jan 14, 2020 2:04 am

What spark plugs the car have?
Volvo plugs or something else?
Spark plug gap is critical on turbo cars.
They don't like fancy plugs....just Volvo ones for turbo engines or cheap copper plugs(NGK or Bosch) properly gapped.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / 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

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