Should I use a genuine Volvo MAF instead of aftermarket?

wizbang · Post by **wizbang** » 29 Aug 2018, 18:11

That's the question but there's more. I think this MAF was swapped out during a prior repair. How does one determine which part number is required short of asking the dealer?

Post by **June** » 29 Aug 2018, 18:19

Maybe one of the online mvs sponsor parts places like IPD can use your vin number like the dealer would to determine the correct part. June

wizbang · Post by **wizbang** » 29 Aug 2018, 18:59

Done. I purchased from IPD. I kept trying to select a MAF under the S80 page until the website said it fit my vehicle. It makes sense to order from a forum sponsor. Thanks.

Post by **oragex** » 30 Aug 2018, 04:30

You also have FCP, they also have a good site showing the fitment - I guess it should be pretty accurate but there can always be mistakes

Post by **mrbrian200** » 30 Aug 2018, 11:09

FCP, like most better sales operations, encourage you to enter your VIN during checkout so that they can cross reference your exact car with the correct parts for it on your order. If you did this you'll get the right one.
There are different MAF part numbers for different engine configurations. Even though they look identical, the internal calibration data is different. There's a small SOC (self contained computer on a chip) buried inside these things. Why Bosch continued to use an analog signal output that is more susceptible to wire resistance, rather than data or a PWM signal, between the sensor and the ECU is somewhat puzzling to me.

Post by **ndphotonl** » 04 Sep 2018, 09:18

Maybe cheaper to produce?

I bought a Bosch unit with matching part number from the unit which was fitted on my S80.

wizbang · Post by **wizbang** » 04 Sep 2018, 09:39

I purchased a maf from ipd. I'm waiting on the etm to return from xemodex. I hope that the running issue will be resolved. It's a matter of return on investment. I've sunk too much into this S80 to sell it off for parts. When it runs it is a great car.

Post by **mrbrian200** » 04 Sep 2018, 11:38

ndphotonl wrote: ↑04 Sep 2018, 09:18 Maybe cheaper to produce?

Not likely. Probably a carryover from older MAF designs which were solid state analog devices. They updated the MAF itself with a digital SOC which would both tighten tolerances/accuracy between individual samples in addition to probably being more reliable than the earlier 'elaborate analog circuit' designs. But didn't update the ECU side to accept a digital or PWM signal that would provide a more 'direct' transfer of information between the MAF and ECU. The MAF SOC working in the data realm would go to a D/A circuit to generate the analog signal output, which would then immediately be converted back to digital via an A/D converter inside the ECU. If you follow/understand what I'm talking about you probably might get why I find it 'puzzling' why they didn't update their ECU design to accept data from this sensor when they updated their MAF sensor design sometime around 1990-1.

Post by **ndphotonl** » 04 Sep 2018, 12:05

That is strange indeed, why make it so complicated to convert it to twice?

Its good to learn other things of "car thingies" I dont have too much knowledge about. I know more about the mechanical side of things