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1994 850 Mass Airflow Sensor

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firestarterpro
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Year and Model: 850 NA - 1995
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Post by firestarterpro »

I bought a brand new Bosch MAF from FCP Euro and my engine dies immediately, after start, with it.

My old one works okay [roughens the idle perhaps] but Ive been unable to find another one that makes my car run. Ive even bought multiple ones from junkyards to no avail.

If this one goes bad, what would be my next step?

Ive replaced all vacuum lines and serviced the PCV twice in this car's life time. I have some extra fuel injectors im gonna get cleaned and try those out next.

Btw, this engine is at 336K miles, non turbo.

Any help would be appreciated.
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The proudest owner of a Naturally Aspired 2.4L Volvo 850 Wagon of 1995!!! :o :o :o
94 850 NA Wagon was hit and totalled at 350k :oops:
96 850 NA Sedan sold at 180k :arrow:
95 850 Turbo Wagon sold at 260k for parts :!:
95 850 NA Wagon sold at 220K :arrow:

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misha
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Post by misha »

Did you bought a proper one?
Maf sensor's part numbers are different from '91-'96 and from '96-'99.
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rspi
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Post by rspi »

Will it run with it unplugged? Is it throwing a MAF code?
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firestarterpro
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Post by firestarterpro »

It wont run unplugged and it doesnt throw a code unless I unplug it.
I purchased it based on a part number for my vin number
._____________,
||------|---||---||__\ \___
\=-(@)-===-(@)-=*B
The proudest owner of a Naturally Aspired 2.4L Volvo 850 Wagon of 1995!!! :o :o :o
94 850 NA Wagon was hit and totalled at 350k :oops:
96 850 NA Sedan sold at 180k :arrow:
95 850 Turbo Wagon sold at 260k for parts :!:
95 850 NA Wagon sold at 220K :arrow:

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misha
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Post by misha »

It isn't a MAF.Otherwise the car would RUN with it unplugged!

Read OBDI codes from under the hood from ports A2 & A6.
2010 S80 D5 / restyling / fully equipped / Twin turbo / Savile Gray Metallic (492)

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
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon

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Post by MadeInJapan »

Reset the adaptives and try again (unplug battery completely and touch the negative and positive wires together...foot on brake pedal for extra measure...), connect battery again- push your 4 digit code on your radio to restart it and see if maybe your ECU had gotten used to the foul way your car was driving and a new MAF just confused it.
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firestarterpro
Posts: 79
Joined: 25 Feb 2015, 04:08
Year and Model: 850 NA - 1995
Location: Dallas, TX
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Post by firestarterpro »

No codes. Recently replaced the voltage regulator in my alternator (had battery disconnected for days)

Could I have aftermarket fuel injectors from a previous owner?

Perhaps I should swap my idle air control valve with another?

Ive taken the intake manifold off at least a dozen times (doing other matinence) and can't think of anything that do this.
._____________,
||------|---||---||__\ \___
\=-(@)-===-(@)-=*B
The proudest owner of a Naturally Aspired 2.4L Volvo 850 Wagon of 1995!!! :o :o :o
94 850 NA Wagon was hit and totalled at 350k :oops:
96 850 NA Sedan sold at 180k :arrow:
95 850 Turbo Wagon sold at 260k for parts :!:
95 850 NA Wagon sold at 220K :arrow:

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