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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 02-09-2007
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I am: Jason LaPorte
Join Date: Feb 2007
Location: Narragansett, RI
Vehicle: 1997 Ford Ranger
Drive Type: 4X4
Engine: 4.0
Posts: 21
Total Props: 0

Does anybody know of any cheap mafs mods. I am not sure if it is okay to do, but I was wondering if I could remove that huge piece of metal inside of the mafs housing and just have the mafs hang down in the tube open and not enclosed in that metal rectangular thing. I am not sure if this would offset the mafs’ reading and cause a problem or not, but I do know that if it would work I would be able to get a good amount of extra power for free. If this would not work would there be a way that I could replace the mafs’ housing with one from a mustang or something? Here is a link for what the mafs’ housing looks like on my truck.
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Old 02-09-2007
n3elz's Avatar
RF Veteran
I am: John Griggs
Join Date: Jun 2004
Location: Kennett Square, PA
Vehicle: SAS'd 2002 Ranger Edge 4x
Posts: 10,620
Total Props: 1
Check my cardomain page. I talk about it there. There's an index at the top.

Now, warning: on a 4.0 the MAF mod can put the curve so far off you will have problems, particularly at wide open throttle. I've been able to tune that out on some by feathering the leading edge of the sense tube -- but it's not guaranteed.

Now, if you have a SCT 9415 (newer Xcal2) or an older one with the Extreme Tune software, you can define a new MAF curve. Basically, you just correct the curve at idle, part throttle, and full throttle and the software draws a "perfect" curve through that.

The 3.0 engines usually have no problems with this -- but lots of 4.0's run lean after modifying the MAF.

John Griggs -- Kennett Square, PA
2002 Ranger 4x4, SAS'd, with too many other mods...

My Cardomain How-To Extravaganza...

"Feels good to get SAS'd, don't it?"
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