I have an aftermarket part on my 2001 F-150 5.4 V8 engine. I bought the truck with this on it. It looks to have to be doing something with mass airflow sensor or something like that. Im not too sure at all. I'm going to take it to a ford dealership to have it get checked out soon, just seeing if anyone had any clue before I went! Also, my truck does rough idle with cold starts if that helps, thanks!

 

Well, that was certainly a hack job! Scotchlok connectors - worst invention for making a good connection ever. Just a guess, but I'd imagine that somebody bought one of those devices that is supposed to modify the signal from the MAF to make the truck run more efficiently or something. If it was my truck, I'd just get rid of that thing. Are there any codes set?

edit: something like this:
http://www.ebay.com/itm/Digimafam-MAF-sensor-compensator-improve-low-RPM-performance-MHK101130SLP-75-ZT-/110968676289?pt=LH_DefaultDomain_3&hash=item19d63f9fc1

 

It looks like what you are talking about and honestly I never even heard about those. My truck is throwing off a few different codes and I have been trying to figure out why. I just assumed the aftermarket part has to do with it. Any clue how where to even start with removing it??

 

I don't *think* that gadget is doing anything to the MAF. Looks to me like it is modifying the IAT signal to prolly get the PCM to go a little richer.


It might be helpful to know what the rest of the codes are.

 

Dammit! That's not the MAF! It comes in from the bottom, doesn't it?

 

The container only has 2 leads so likely just a resistor connected in series with whatever it's connected to.
You just cannot get any gains this way because the final results is the Ox sensors senses any changes and causes the PCM to adjust the fuel tables to compensate.
When this is done fuel mileage goes worse and any table shifted out of limits sets a code.
These systems are a closed loop affair. You cannot just invade them from the outside for any gains because the program will try to correct for the change and result in operating issues.
If this device is connected to the IAT it is fooling the computer into an offset signal that affects cold starts and running fuel injection levels.
A CHT out of limits for resistance will do the same.
Take it out, close the leads through color code to color code.
Good luck.