Hello everyone, I have a 1992 custom F150 5.0

I just got this truck this week for $780 bucks (not running). I got it Running after running an ob1 scanner the first day I worked on it . So I was stoked !. Came back with a bad map sensor. It started up right after. The previous owner replaced a Cap & rotor plus wires which I’ve checked the firing order and are all correct.



There is an exhaust leak that might be building a little bit of back pressure, but I’m not sure if that’s what’s causing it to run a little bit shaky or boggy ( if that makes any sense ) when accelerating . The exhaust is pretty big. Please see the pictures attached. Let me know if you guys think that might be it.?

I’m gonna be checking the timing today, and setting it where it supposed to be, if it’s not .

Getting to the point, I found this loose wire with two cables, one yellow with white and another white with a red stripe that seems to be unplugged from somewhere. I looked around and don’t seem to find anything that it goes to. Can you guys help me identify where it goes to? . Or how to go about repairing it if needed?

Thank you guys so much in advance. Please see the pictures attached.

 

I'm more familiar with the bricknose setups, but I would check the three vacuum solenoids on the driver side valve cover, and check the power steering pressure switch. I can take a look at my '94 tomorrow and see if it has that same pigtail.

Depending on where it is, an exhaust leak can throw off the oxygen sensor's reading, causing it to detect a false lean condition. The ECU will compensate by richening the mixture, which can cause driveability issues. But the oxygen sensor is only used during closed loop.

 

I think it's the power steering pressure switch.
Haynes shows it as yellow/light green and grey/red.
Maybe the whites are actually light green and grey.
I've seen Haynes be wrong before.
Visually, the connector looks like my power steering pressure switch connector.

 

Yeah I think the 94’ might show where it leads to, because my 95’ Eddie Bauer doesn’t have that plug .

yeah I’m going to take it to a muffler shop to see what they can do maybe straight after the catalytic converter? . Have you ever done an exhaust set up on these ? Are the catalytic converters expensive?

 

This is great !. I will take a look in the morning. I’ll follow up if it works out .

 

Bump ! Still haven’t found where this plug goes to . Any help is greatly Appreciated

 

Is there a connector plugged into your power steering pressure switch?

 

Sorry, I forgot to reply. I checked my Bronco and it does not have that plug, which further points towards that being a power steering pressure switch connector, since I know for a fact that 5.8l trucks did not have that sensor. So check your power steering pressure hose and see if there is an unplugged sensor. Or maybe somebody replaced the pressure hose with one that doesn't have the switch port, and that's why it has been left unplugged.