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View Poll Results: How often do you clean your MAF sensor?
Once a month or more 22 3.36%
When i change my oil 91 13.91%
When it needs it, I can tell by my EM or my butt dyno 159 24.31%
NevAR 385 58.87%
Multiple Choice Poll. Voters: 654. You may not vote on this poll

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Old 01-03-2011, 11:04 PM   #126
SBW
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There is a pre-dyno checklist that you should always go through first. You should throw new plugs check gaps, new fuel filter, check for boost leaks, etc... to that list as well before going for a dyno tune
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Old 01-03-2011, 11:10 PM   #127
Columbo
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Yes, new plugs, air filter, fuel filter...within 10k miles of dyno tune was good enough for me...and them. I didn't know about the MAF, BUT they certainly should have!!

The car runs fine, but I felt the boost was not as steady as it used to be prior to them tuning it. The reason I went in! It's better now. But I used to get 26 mpg average. That had dropped to 24 mpg. Then as expected after the dyno-tune, it dropped to 22 mpg with relatively gentle use of the turbo in all tests.
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Old 01-15-2011, 04:14 PM   #128
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I cleaned the MAF and IAT sensors and mileage went from 22 to 24.7.
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Old 01-15-2011, 06:15 PM   #129
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Useful thread. Doing this soon. Thanks all.
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Old 01-20-2011, 04:26 PM   #130
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Thank you for posting this. I have an '06 STI which as far as I know has never been cleaned in the 52,000 miles on the odometer. I took mine out and it was pretty disgusting, let's see if this cleans up my rough idle problem...
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Old 01-21-2011, 11:13 PM   #131
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i was thinking about doing this before i found this thread so when i saw it i got some cleaner and went for it. 177xxx on the odo, i doubt it has ever been cleaned. The car always stumbled a little bit at the onset of boost and i thought it was a transmission/suspension issue. Now pulls are clean, 100% different feeling. thanks the the OP on this one!!!
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Old 01-23-2011, 04:50 AM   #132
mrlimit
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Default Definetly a good idea.

After I cleaned mine with a autozone brand maf cleaner and changed plugs the low RPM hesitation went away and gas mileage is just so much better. I was getting at most 23-24 now closer to 26 if I behave lol.
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Old 01-23-2011, 08:21 AM   #133
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yay no more maf sensor for me but yeah maybe every 2 months i did mine.
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Old 01-23-2011, 12:00 PM   #134
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so i reset my ecu the day after i cleaned my maf. The car pulls even better now, but the idle is really wandering on cold starts, sitting almost at 1800. when its warmed up and i start it seems to idle really low. The radio is frozen but i think i just have to unplug the battery again.. anyone experience this after the maf cleaning/ecu reset?

edit: just saw this was 2.5l so if anyone opposes this question i can start a thread in 2.0l

Last edited by wrx surfwagon; 01-23-2011 at 12:05 PM.
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Old 01-25-2011, 03:12 AM   #135
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So turns out the wandering idle was due to the cold. All good.
Also, can anyone tell me exactly why cleaning the maf smooths out accelleration? I went from gettin a distinct stumble at 33-3500 rpm to a perfect, steady climb. is it possible the ecu was pulling timing? and is there anything i should check out to make sure nothing is damaged? I'm doing a comp test when i do my plugs in the near future
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Old 03-24-2011, 06:20 PM   #136
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Would it be the same procedure for an 04 wrx engine? Replaced IAC and still have a weird idle.

Had a smoke test and there are no vacume leaks. Thanks
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Old 03-25-2011, 08:18 AM   #137
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I have cleaned mine on the STI and done cleaning on several other peolpes high mileage cars, it has ALWAYS helped the way they run. always with a battery off reset of the ecu.....but great results on every vehicle I have done it to.
GOOD LUCK.
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Old 03-25-2011, 05:10 PM   #138
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if you dont clean this every oil change or monthly, you shouldnt own this car and if you dont know how to clean it...........well you get the point!!
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Old 03-25-2011, 05:26 PM   #139
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Quote:
Originally Posted by Bakerbrdz View Post
if you dont clean this every oil change or monthly, you shouldnt own this car and if you dont know how to clean it...........well you get the point!!


Please show me in the owners manual where it says to clean the MAF monthy or every oil change.
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Old 03-25-2011, 05:30 PM   #140
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Quote:
Originally Posted by Columbo View Post
I cleaned the MAF and IAT sensors and mileage went from 22 to 24.7.

...and that one tank only.

Still only averaging 21-22, 80% freeway @ 75-80 mph. Not bad I suppose. Doubt I'll ever see the 24-26 mpg I used to get.
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Old 03-25-2011, 05:58 PM   #141
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Cleaned it with the crc maf cleaner. Took all of five minutes, seems to run a little smoother
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Old 03-26-2011, 06:48 AM   #142
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ah...which reminds me. time to do this again.
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Old 04-14-2011, 11:45 PM   #143
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So let's say my car all of the sudden threw a lean code, and has been running kinda crappy since...what are the chances it's my dirty never cleaned in 76,000 miles MAF? Going to clean it tomorrow after work!
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Old 04-15-2011, 07:10 PM   #144
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I've had lots of vehicles with MAFs. Mostly american stuff, but I don't ever remember cleaning one, all draw through though. Blow through apps you need to watch things pretty closely as the PCV systems on Subarus pump a fair bit of crap back into the intake tract.
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Old 04-21-2011, 11:50 PM   #145
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Well I cleaned my MAF and the difference is nothing short of AMAZING!!! It's like a brand new car.
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Old 06-29-2011, 03:51 AM   #146
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Thank goodness I stumbled on this and the IACV thread. Most definitely doing both ASAP.

almost 60k and have never cleaned my MAF... and on top of that the last time I cleaned my K&N filter I over-zealously oiled it...

**facepalm with palmful of how-am-i-so-noob**
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Old 06-29-2011, 06:18 AM   #147
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I have to change out the MAF in my Boxster every 15-30k miles and it doesn't like being cleaned. At $300 a pop, it gets kind of expensive. O2 sensors only last 60k and they are $300 each too x4. My STIs were cheap to maintain compared to this thing.
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Old 06-30-2011, 08:48 AM   #148
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I never thought of this.... I just bought my Subie and am doing some "new car" maintenance (06 WRX) also I was told that there is a filter before the turbo that you need to change and I can't find any information on this... Does anyone know of a secondary oil filter specifically for Subie turbo's? Sorry for the newb q's but my first Subaru (previously drove Infiniti)
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Old 06-30-2011, 12:38 PM   #149
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i dunno how crappy your air filters are, or how dusty your environment is, but my 07's sensor was clean. 4+ years and clean.
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Old 07-01-2011, 09:48 AM   #150
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Quote:
Originally Posted by kungfuturkey View Post
I never thought of this.... I just bought my Subie and am doing some "new car" maintenance (06 WRX) also I was told that there is a filter before the turbo that you need to change and I can't find any information on this... Does anyone know of a secondary oil filter specifically for Subie turbo's? Sorry for the newb q's but my first Subaru (previously drove Infiniti)
http://store.forcedperformance.net/m...Info_SubaruOil

read this
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