Voltage based MAF device

[Len Sabatine]

   Andrew , might want to be sure the MAF your friend has wasn't intended 
for a Nissan,
   Physical appearance is the same , voltage signal range is not. Verify 
before chasing tail.
   FYI - 88- 93 Mustang MAF is same. Some V6 [3.8- 4.0] Ford MAF s are 
larger than V8 OEM.
   Being motor heads , deviance is not abnormal , [ watch what you apply 
that to tho ] .
    Len

>Swayze wrote:
> >
> > suggest you check LM331 at National (an-c.pdf?)
>
>Not sure that's the direction I need to go - a V/F device? Hmm....
>
>More info. I didn't admit this in the original post - since this is the
>*GM* ECM list, but my friend's truck is a Ford. If you hardcore GMECM
>types will allow me a little deviance, here's a little more detail on
>what he has done...
>
>It started as a MAP-based 1987 (I think, could be an '88) 2.9L V6 Ford
>Ranger. He added a larger stock Mustang throttle body, purchased a
>California-only version of the Ranger ECM which was MAF based, and added
>a stock Mustang MAF sensor (stock Mustang parts can be had for about the
>cost of shipping these days). He's had to fab a few plates from aluminum
>to get stuff to bolt up, but it's actually working very well, and with
>his ported intake and exhaust work he's picked up about 1/2 second in
>the 1/4 mile so far. He also has "bragging rights" that his Ranger is
>MAF based, rather than MAP.
>
>However, he's got just this one little "deal" with the MAF sensor
>reading too low at idle. I'm wondering, though, if he could simply
>insert some sort of restrictor plate in the main body of the MAF meter
>to force more air through the bypass measuring area of the Ford MAF
>sensor. That way we wouldn't have to have any electrical tomfoolery.
>(Since the Ford MAF sensor has a main artery, and a small "bypass" area
>where the actual metering occurs.)
>
>He has a book on Ford fuel injection that has him measure the input
>impedance of the MAF sensor input to the ECM, and it does measure low
>(the book says "should measure over 10k ohm", but it actually measures
>about 3.33k ohm). This does concern me (umm, that would cause voltage to
>read low!), so I might look at the ECM, or recommend he swap it for
>another one.
>
>Sorry for the non-GM content, but I think it's a pretty interesting
>project nonetheless. Thanks for the ideas so far!
>
>-Andrew
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