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2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" cars.
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2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby E170_Driver » 04 Feb 2010, 04:35

To continue my endeavour of keeping my 2001 V70 2.4T running smoothly and learning more about this vehicle, I have decided to clean the MAF sensor which was next on my list of preventative maintenance. Tools required for this job was a straight edge screw driver, a T25 torx bit and a wrench. Costs involved were $6.99 for the MAF sensor cleaner and $24.99 for the air fliter (ouch, I will order from the internet next time).

The MAF is located right next to the air filter with an electrical connection attached to it.
Image

From a side view one can see that there are two torx screws (sixe T25) which we will attend to later.
Image

First one needs to disconnect the electrical wires to the unit; be very careful, the connector is very fragile. I used my straight edge screw driver to lift the plastic clip on the connector...
Image

...and then pull the wires.
Image

Next was opening the air filter housing (gotta pull a little to get it to free).
Image

I loosened the clamp around the downflow part of the MAF housing. In order to remove the MAF unit (still attached to the top of the air filter housing) one needs to pull/wiggle a little to get them separated, just be patient and careful.
Image

Here is a good view of the MAF sensor once removed. Notice the torx screws, yep they are next. There is a rubber seal located within this connection.
Image

Once everything disassembled, here is what I got; in addition there is the rubber seal and air scoop (very easy to remove, just pull a little on both ends). Follow directions on the spray can for the cleaning process and then let the MAF sensor dry for 1-2 hours.
Image

Back in the engine compartment I was left with the following; the lower part of the air filter housing, which was rather dirty indeed...
Image

...so, I cleaned it and the air scoop (shown here after I installed it).
Image

Before I went back to the car, I placed the rubber seal back into place at the opening of the air filter housing. After placing the new air filter onto the lower part of the housing, the challenge (on this model at least) is always installing the top part. It takes a little force to place the unit into its grooves and holes, once again a little patience and lining up the connections exactly goes a long way.
The back part of the housing...
Image

...and the side part of the housing.
Image

Once in place it ought to look something like this.
Image

The label on the MAF unit makes installing it the right way rather easy (not that it would fit the other).
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I first pushed the unit a little into place (u will get a little resistance from the rubber seal) until I can start inserting the Torx screws; then tighten the unit into place.
Image

Then reinstall the aft end and tighten the clamp and there you go...
Image


May I add, that by no means am I a listened/professional mechanic. I got tired of dealerships giving me the run around about what needs to be done with the car and with the help of lots of research (most of it from this website regarding my Volvo) have I started working on my own cars (the others being a VW and Jeep). My vehicle has now more than 138,000 miles and as mentioned before, I am just trying to do preventative and sometimes necessary maintenance in order to keep it running good. The cleaning of the MAF sensor is a rather easy thing to do, but I noticed that the car has some very rare subtle/slight hesitations while engaged to the cruise control (not trying to think about the ole ETM debacle on this model; I still have a white sticker with the updated download).

I would like to add one more observation. When I started the car for the first time after the MAF sensor cleaning, I noticed that the idle was fluctuating between 800 and 1200 rpm for about 10 seconds. I have read many accounts from Volvo owners having idling problems and would like to say that maybe a cleaning of the MAF sensor possibly solves some of these issues for certain folks. I meanwhile have driven the car and I blame the 10 seconds of erratic behavior on some liquid left behind on the sensor; no problems since then. We will see on Friday morning, going back up to Indianapolis (250 miles).

If there are any suggestions or corrections on what I should have done better, differently or not at all, please do; I will do this cleaning of the MAF sensor again.


Jan
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby seggs » 04 Feb 2010, 14:46

Where did you purchase the MAF cleaning spray?
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby confused_al » 04 Feb 2010, 15:27

seggs wrote:Where did you purchase the MAF cleaning spray?
Any auto-parts store, pepboy, autozone even walmart.
As a lazy old fart, I clean my MAF from the other side (the screen side) without taking out the whole airbox. Just want make sure NOTHING touches the sensor.
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby E170_Driver » 04 Feb 2010, 15:33

confused_al wrote:
seggs wrote:Where did you purchase the MAF cleaning spray?
Any auto-parts store, pepboy, autozone even walmart.
As a lazy old fart, I clean my MAF from the other side (the screen side) without taking out the whole airbox. Just want make sure NOTHING touches the sensor.


AutoZone it was...

Jan
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby jblackburn » 04 Feb 2010, 15:47

Jan, this is an excellent step-by step write up with lots of good pictures :mrgreen:

I'm going to add this to the repair database, the pictures of the process will definitely help people (at least people like me who are better off seeing things) a lot.

Thanks again!
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby E170_Driver » 04 Feb 2010, 15:52

jablackburn wrote:Jan, this is an excellent step-by step write up with lots of good pictures :mrgreen:

I'm going to add this to the repair database, the pictures of the process will definitely help people (at least people like me who are better off seeing things) a lot.

Thanks again!


Morning JABLACKBURN,
that is exactly why I took all those images. For novice mechanics like myself, I need idiot proof explanations/pictures to guide me through the process; I realize that most of the steps are self explanatory/easy, but I mainly put this together for folks like myself.

Thanks

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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby apollo5 » 24 Feb 2010, 23:47

I'm like you, can't stand getting taken to the cleaners. One dealer once sent out a "savings" where everything listed was only $189.99 even a full detail, $200 bucks to wash my car, $200 bucks to rotate my tires? I don't think so! Having small hands helps me get to tight areas also. Just replaced my front o2 sensor and if not for small hands to just reach the wiring harness which is a bear to release the locking connector.

Anyway, I'm going to clean my MAF. Your pics don't show on my computer but maybe they will when I get home and off my company's network.

Thanks
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby apollo5 » 26 Feb 2010, 03:00

What exactly gets sprayed on the MAF? What exactly is being cleaned off to make a difference? Can instructions don't help not a true mechanic, what are the "hot wires"?
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby crespo » 26 Feb 2010, 20:43

That's a great write up but you haven't actually shown how to clean the MAF.
For those that don't know the actual MAF is the bit that goes in to the round tubing held in with the two torx screws. You do not need to completely take apart the filter housing to get at it.
Simply unplug the wires connected to it, remove the 2 torx screws from it pull it out and spray it with carb or MAF cleaner. There are some thin wires inside the unit (these are the sensors), Spray these with the cleaner and allow to dry then re attach it. Job done. DO NOT USE A COTTON BUD OR ANYTHING TO TRY AND CLEAN THESE WIRES as you will kill the MAF, Just spray it.
The 2 torx screws are T25 security screws and have a little nipple in the middle so they cant be removed with a normal torx bit.
I use carb cleaner as it removes the built up dust etc on the wires without having to physically touch them with anything.
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby apollo5 » 27 Feb 2010, 00:54

Thanks Crespo!!!
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby hethaerto » 27 Feb 2010, 09:59

The last time I cleaned my MAF, my MPG went from 19 to 21.5 instantly. I was like :shock:
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby E170_Driver » 27 Feb 2010, 20:57

You are right CRESPO,
I was unable to take picture of the actual cleaning since I was holding the MAF and the cleaner, but the instructions on the back of my cleaner bottle were pretty precise. I will write them down when I get back home...

Jan
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby mrichard009 » 27 Feb 2010, 21:15

so you have the MAF module sitting out to the side. Do you spray up by that filter and stuff or do you take the electronic socket out the side with the torx and spray in that?
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Re: 2001 V70 2.4T Mass Air Flow (MAF) Sensor Cleaning...

Postby whaleplane » 27 Aug 2010, 20:51

This is an awesome description of how to get this done. However.... I have run into a little snag. I got the MAF housing off of the air filter easy enough but could not get it off the down flow side. I undid the bracket holding it on and the sensor clip but I tell you what the other two parts were not going to come apart. If I didn't know better I'd say they were epoxied together. As with everything I took it to the point of trying any harder would probably break something. Is there a trick to getting the two pieces apart? I tried wiggling, twisting, pulling all with no luck.

I noticed the sensor is held in place with two torx security bolts. Can you take the sensor out that way and clean it? Is that wise or is that a bad idea?
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