YumyJager

Is the 12v MAF a 4 wire?

quattro.pilot

depends. some are 4, others are 3 (the modible ones, 078 133 471A)

YumyJager

Darn

quattro.pilot

I'm going to/want to innovate to see if I can't do something about the small bore MAF. UrS4 has said he would try, except for the lack of small-bores available to him. So it's up to us...if you think of anything or accomplish something yourself, give us a hollar =)

check yah later

SiV6Qcoupe

In the past I wanted to wire MAF signal intercepter so in research I pulled back the rubber boot to expose the terminations on the MAF housing loom plug.

There are actually 4 wires coming from the loom but looking at the plug there are only three pins that are terminated. When measured with a multimeter when the engine was idling, two wires are crimped together on a pin that is ground, one terminates as 12-14v and the third as the return signal (0-5v).

So, for my '94 spec mpi there are four wires, two of which being 0v/Ground are crimped as one at the MAF connector plug.

quattro.pilot

so, follow me through on this:

3-pin MAF's actually have 4 wires, just that two of them are spliced together into one terminal connection. And these go to GND.

4-pin MAF's really have 4 wires. But the two grounds are kept seperate, yet still go to GND.

Ok. WHAT IF we took a 3-pin MAF & just the plastic connector head, having previously determined which leads/pins were switched (12v-14v), GND, and return (0-5v). Then we separate the wires from a 4-pin connection (noting which wires are which blah blah blah.) Now we connect the grounds together and replace the appropriate wires into the appropriate terminals of the 3-pin plug. If everything is the same, technically shouldn't the 3-pin MAF now accept and function properly with the existing wires modified to be the same as the 3-pin MAF is used to "seeing"??

did that make any sense. Wow, I need more free time. It sucks...I have all the tools & electrical equipment to run quite a tuning and modification shop. Just not the time or drive, hehe. Well, we'll see about that.

impressions? I've just reborn my whole MAF debate but on a different forum! muahahaha

check yah later

SiV6Qcoupe

If you can take readings of the four wires and ascertain that you do indeed have two seperate 0v/ground wires along with a power source and a signal then it looks promising.

Check the signal is within the 0-5v range as the early MAFs were Bosch as opposed to the later Hitachi so the signal could be a different range.

quattro.pilot

thanks for the encouragement

check yah later

Joe Sixpack

Re: Is the 12v MAF a 4 wire? So you can't swap the small bore to the new larger bore easily?

quattro.pilot

but I'm workin' on a solution towards a possible swap. I'll keep ya'll posted

check yah later