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I killed a MAF with brake cleaner

  • Deltron
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11 Apr 2019 17:24 #28593 by Deltron
I killed a MAF with brake cleaner was created by Deltron
Today I was chasing an intermittent misfire on an 05 Subaru Forester. P0301, 2, 4 codes. It was a weird one, the stumble/miss would come and go at random. Scoping it looked like a lean/no fuel misfire. I pulled the MAF and it was dirty so I cleaned it with a couple quick shots of brake clean then shake it out, like I always have. Reinstalled MAF and car now starts and dies immediately, every time. You could get it to stay running if you gave it quite a bit of throttle (50%+), but I managed to get an idle MAF reading of 86g/s. Tossed that lump of shit into the trash and the new MAF seems to have solved the misfire.
The following user(s) said Thank You: Noah

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  • Tyler
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12 Apr 2019 14:41 #28627 by Tyler
Replied by Tyler on topic I killed a MAF with brake cleaner
Been in the same situation with a Nissan. :( Lean trims, hesitation, scan data is screaming incorrect air measurement. It's a comeback on another tech, so we can't sell a MAF. I suggest attempting a cleaning, and the boss is all for it. :silly: A shot of brake cleaner later, and the MAF is d-e-a-d. Now we gotta eat a new MAF.

In both cases, I think the MAF was already on the way out. :angry: This is why I hesitate to clean a MAF any more, even with the specific MAF cleaner.

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21 Nov 2019 20:31 #35195 by heyinway
Replied by heyinway on topic I killed a MAF with brake cleaner
Brake cleaner is basically acetone...not plastic friendly.

CRC mass air flow sensor cleaner is a combination of 2 ingredients in making gasoline...plastic friendly. Isohexane a "cleaner" and trimethylpentane "100 octane".

Can't use CRC mass air flow sensor cleaner on Karman-Vortex sensors found on Toyota Supra Turbo, Mitsubishi, and most Lexus vehicles. (fine print on the can)

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23 Nov 2019 13:01 #35241 by wbrockstar
Replied by wbrockstar on topic I killed a MAF with brake cleaner

heyinway wrote: Brake cleaner is basically acetone...not plastic friendly.


Interesting I didnt know this,but I also never bothered to read its ingredient list either.Years ago I had bought two really expensive rims from a co-worker to mount on my brand new Mustang LX Notchback.Problem was,the clear coat was yellowed & peeling off in a bunch of places.I remedied this by using a half gallon of acetone + rags + 1-2 hours of my time + 1-2 hours of elbow grease. They came out looking brand new.After I was done,the only thing I had to do was make a trip to town to buy two new rims to match.The only reason I brought this up was to verify if brake cleaner will work just as well as the acetone that comes in a gallon can,since you used the wording "basically acetone"?? If acet
is the only ingredient,it should work just the same as whats in the can.Thanks for the info and any feedback.

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