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Old 01-25-2010, 04:28 PM   #1 (permalink)
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Took my car in because of some rough idle as well as CEL coming on at times when the idle would get really rough. They replaced all the plugs per my request as they had not been replaced in a while.

They said there was a vacuum hose that had collapsed and needed to be replaced and they also said my Mass Air Flow sensor was bad and needed to be replaced. I said go ahead with the 10 dollar hose but hold off on the $225 MAF sensor as that seemed a little too high in price.

Question is how can I tell if the sensor is bad or just dirty? I have read many posts about cleaning the sensor but not much about them being replaced. I would much rather spend 5 bucks cleaning it then replacing it, but I wanted to make sure I was not cleaning a bad sensor...Will a CEL be shown if it is bad (or will i just need to clean and wait and see if the CEL comes back and if it does I can assume its bad? Didnt clean it well enough?)

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Old 01-25-2010, 06:37 PM   #2 (permalink)
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It wouldnt hurt to try and clean it first. Just disconnect the bat., disconnect and unscrew it, hit that thing up with some aerosol electronics cleaner, and replace. By the time you reconnect the battery, the ECU will have reset. If that doesn't clear CEL then you can replace it yourself. You may want to find someone with a Scantool too see what codes it is throwing before you replace the whole thing also.
Onlinemazdaparts has yours for $140 it looks like. Here: http://www.trademotion.com/partlocator/ind...p;siteid=214264

ok sorry for the bad link, but once you are there, just put in your info for your car make/model and search for "mass sensor"
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Old 01-26-2010, 12:15 AM   #3 (permalink)
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I would clean the MAF with MAF cleaner and then clean the TB with TB cleaner just cuz you are there already lol.

Yea its real easy peasy to clean. Just be careful and NOT poke the straw down into the MAF, just hover and shoot! There is a write up on cleaning the MAF here. IIRC it's an archived pdf that's stickied here from mazda6tech.

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Old 01-28-2010, 03:40 PM   #4 (permalink)
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Make sure to clean the electrical "connecter" that plugs into the MAF as well. Sometimes those get dirty and doesn't allow a perfect electrical connection with the MAF.
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Old 01-31-2010, 01:13 PM   #5 (permalink)
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The best way to check your MAF sensor is with a scanner that shows live data. For example the "MASS AIR FLOW (MAF) SENSOR INSPECTION" procedure from ALLDATAdiy.com for my 03 3.0L MTX states:

At Idle ~700-800 RPM's intake MAF should be 3.6- 3.8 g/s and at 2500 RPM's MAF should be 10.5 - 11.4 g/s.

These readings should be taken with the engine warm, in Neutral with the parking brake ON. If you have altered your intake all bets are off and this data may not apply.

I had to replace mine and it took 4 tries to get one that read correctly!!!!! All the others read 5-20% HIGH. I tried ones from NAPA and AutoZone and the only ones they had were remanufactured DENSO's for around $90. Reading high will make your car run rich because it will think it is getting more air than it really is.

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Old 02-12-2010, 01:57 PM   #6 (permalink)
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Old 02-16-2010, 06:55 PM   #7 (permalink)
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my mazda store here quoted me a price for the maf at 70ish bucks cad so if you need one let me know and i can pick one up for you and ship it
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Old 02-17-2010, 12:32 AM   #8 (permalink)
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QUOTE (bolg033 @ Feb 16 2010, 05:55 PM)
Quote:
my mazda store here quoted me a price for the maf at 70ish bucks cad so if you need one let me know and i can pick one up for you and ship it[/b]
That canadian or usd? LOL Sorry I had to ask!
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Old 02-17-2010, 05:05 AM   #9 (permalink)
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QUOTE (kpjimmy @ Feb 17 2010, 12:32 AM)
Quote:
That canadian or usd? LOL Sorry I had to ask! [/b]


wise guy eh! :P
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