gary42127

I have a 2004 F-150, 2wd, 5.4, Supercrew. Laying on top of the passenger side valve cover, near the rear of it, is a red wire or vacuum line that runs down behind the engine. It isn't connected to anything, and I'm wondering what it's for. The truck seems to be running fine.

Thanks

Ty

if you could get us a picture, Im sure we could be of more help.

gary42127

You mean my excellent description wasn't sufficient?

I'll see if I can get a picture in the morning.

Ncrager

I have the same the same thing on my 4.6, it has a plug in it that looks like factory.

NGM

Its a test port.

gary42127

Here's a picture of it.



If it's a test port, what does it test?