For those with URD intake....

maf cal has nothing to do w/ it. are u getting a CEL? its more than likely b/c u didnt solder the connections. how did you connect them? wirenuts, twist and tape...etc?

 

I bet it is because you didn't solder. You should solder them right away before any corrosion starts starts forming on the wires.

 

it is pretty easy.

First: Slide the heatshrink onto the wires.
Second: Look at my attached picture and do one wire at a time
Third: Get a soldering iron and some electronic solder (NOT the plumbing stuff)
Fourth: Heat the back of the wires with the solder.
Fifth: Feed the solder into the front of the wires (opposite the soldering iron)
Sixth: You want the solder to be drawn in fully. You should still be able to make out the wires when you're done.
Seventh: Mash down any sharp edges from the wires protruding and slide heat shrink over the connection. You can use a cigarette lighter to shrink the tubing.

 

if u dont wanna get fancy, just get a roll of solder from autozone, advanced, etc and a cigarette lighter. roll out about 6" of the solder, heat it up w/ the lighter til it melts up, then quickly touch that to the wires that are twisted together....then wrap them in electrical tape afterwards. easy to do.

 

This will probably work fine, but your best connections will come from the wire being heated first.