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Discussion Starter · #1 ·
A buddy is trying to fix a problem with his MAF (Mass air box/sensor/thingie) on his 94 Toy truck.

It seems that somehow, even though it was stock and had never been taken apart before, the little clip that holds the MAF adjustment wheel in place worked loose allowing the wheel to rotate an unknown number of turns.

Is there any way to figure out where it needs to be set back to so we can get it back to the stock (or at least running good) specs?

We really have no baseline measurement - so where do we start?
 

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Everthing I've read on this is that it is VERY touchy and at that, very TRICKY to play with. My first call would be to get one out of a donor rig and that might fix the problem all toegether? Wonder how it moved if it was never touched? Spooky..Youcould always take it to the stealer and have them tell you it needs to be replaced <IMG SRC="smilies/smile.gif" border="0">
 

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Discussion Starter · #3 ·
It moved because the clip that holds it in place came loose.

He is running the one from my 90 trail truck for the time being - but I need that back for a ride this weekend <IMG SRC="smilies/tongue.gif" border="0">

I don't have any on any of my parts trucks at the moment unfortunately, but he is calling around to get prices on used ones right now.

But since there is nothing wrong with this one except it is out of adjustment, I think it would be absurd not to try to get this one back up and going - it is not like we are out anything but our time for trying...

So anyone know how to help?
 

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does the truck run at all?
here are a couple of ideas, we all know the box changes the rich lean, so if it runs you could test that and adjust accordingly.
the other thing i could think of is terminal resistance, like you do a TPS or something.
 

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Well I guess I'd just keep adjusting it until you get to run the way it should, but I'd definatley find another one just in case it becomes a PITA to get right or once you do get it right, it does it again.
 

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Discussion Starter · #6 ·
Originally posted by Bones:
<STRONG>Well I guess I'd just keep adjusting it until you get to run the way it should, but I'd definatley find another one just in case it becomes a PITA to get right or once you do get it right, it does it again.</STRONG>
it looks like the "trial and error" method is what we will end up doing, but we were hoping for a starting point to narrow the possibilities <IMG SRC="smilies/frown.gif" border="0">

Yes, it runs, but it idles like crap and runs super rich...
 

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Originally posted by DRM:
<STRONG>it looks like the "trial and error" method is what we will end up doing, but we were hoping for a starting point to narrow the possibilities <IMG SRC="smilies/frown.gif" border="0"></STRONG>
This is a job for Ed Wong... He's the expert on the MAF and how to get it adjusted perfectly - he might even be able to tell you the best way to find the "factory" position... He's on the 4x4wire list.

bkg
 

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keep us posted and if you cant find any info i can check that catalog later to see which way to turn that bastard wheel anyway.,
 

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You can measure the voltage of one at say 1000rpms. Then keep adjusting until you get it to match, or as you said trail and error. If you are to rich or lean by even a small amout it will fail emissions, mine did but I marked it were stock was.
 

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Originally posted by DRM:
<STRONG>it looks like the "trial and error" method is what we will end up doing, but we were hoping for a starting point to narrow the possibilities <IMG SRC="smilies/frown.gif" border="0">

Yes, it runs, but it idles like crap and runs super rich...</STRONG>
turn it clockwise to lean it out and counter clockwise to enrichen!

[ 10-23-2001: Message edited by: Ross A Hildebrandt ]
 
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