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Anyone repaired or refurbished a MAF?

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seagryhill
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Anyone repaired or refurbished a MAF?

Postby seagryhill » Wed May 20, 2020 8:59 pm

Hi All,

Over the last 18 months or so I've had a number of rough running issues (MK2 2000 1.8 pretty much stock everything including the rust).

The first issue (not starting and rpm around 300 when it did) turned out to be a bad cam angle sensor - fixed.

Then a few months later the engine started running really rough and the rpm was all over the place. Turned out to be the MAF. Got a used one, replaced the old unit and all good.

A few months on and the engine started to run really rich (stinky petrol rich and stalling etc, like a bad Briggs and Stratton). Changed the MAF - all good again.

So really the question is: I now have 2 old MAFs, is there a way I can check if they are working (after cleaning the sensor of course), short of putting them on an engine and risking all the issues (albeit for only a few minutes)?

My idea is to put 12V across the input pins and check the output. Does any one know what comes out? I presume it is a varying voltage or resistance that is proportional to the airflow. Is it possible to Frankenstein the two bad MAFs and hope to make one good one and how to check this?

I'm sure someone on here will know what I'm after. It seems such a common issue that there may well be others interested in 'how to refurbish and check a MAF'.
Thanks in advance.
Mk1 G-Ltd Eunos 1.8 (well sort of, all the bits except the shell)
Mk2 1.8 restored (was dead, now it's alive)
Toyota Hilux for towing MX5s on trailers
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blackyb
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Re: Anyone repaired or refurbished a MAF?

Postby blackyb » Wed May 20, 2020 9:08 pm

Been around MAFs for a while but have never had reason to check or frankrnstien two to make one.

So far not had an issue with a good second hand one that I fitted on a mates 1998 1.8.

That said I am no super Mazda Mender just your average Joe.
1993 1.6 Eunos Roadster (gone)
1998 UK Mk 2 1.6 (gone)
2003 1.8 SVT Sport (Why did I sell it - cos the wife said so!!!!)
1991 1.6 Eunos Roadster with a bit of bling.

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Re: Anyone repaired or refurbished a MAF?

Postby Mazda Mender » Wed May 20, 2020 10:30 pm

Well you have nothing to lose really by butchering the two for a play....bit let me look for something on my hard drives on testing them.
M-m
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seagryhill
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Re: Anyone repaired or refurbished a MAF?

Postby seagryhill » Thu May 21, 2020 9:44 am

Thanks guys. Part of me is curious as to why a single unit can cause so many different issues. I guess the running rich bit was saying that the MAF was measuring more airflow than there was while the rough running must be something completely different. For the second bit I might need to find out what the ECU is expecting from the MAF.

At £40-70 a pop if one can be refurbished and checked simply it means I would have one (or two) good spares. I'll take some snaps as I go through the checking etc.

(I must have too much time on my hands...)
Mk1 G-Ltd Eunos 1.8 (well sort of, all the bits except the shell)
Mk2 1.8 restored (was dead, now it's alive)
Toyota Hilux for towing MX5s on trailers

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