whats this?

[91explorermatt]

1991 4.0 ohv found this right by the coil pack

 

[Maniak]

Looks like the Map sensor connector. Some 1991's have a MAP sensor. If it does, its on the firewall right near the coil pack. If not, you will see a cover plate where it could go.

On DannyBoy's 1991, he had the same connector. On the spare 1991 wire harness I have sitting here, it has that connector but it has a MAP sensor on it..

~Mark

 

[91explorermatt]

the MAP is right next to the a/c box and it has a hose that runs to the throttle body right? why would it be gone, don't I need it for the truck to run well?

and can I take the one out of the 2.9 and stick it in the 4.0?

 

[Maniak]

If your computer is one that is setup for MAP, then you need the MAP sensor, not all 91's actually use the MAP sensor. I've seen at least 1 so far that had the wiring for it, but didn't have the MAP sensor itself.

Did I understand you correctly that you do have a MAP sensor on the firewall and that it does already have an electrical plug on it along with a vacuum line?

~Mark

 

[91explorermatt]

I talked to someone who knows a lot about fords today and he said that it was for the map but I have a maf, and the harnesses are universal.

 

[Maniak]

That means yours is the 2nd 1991 with the connector for MAP without an actual MAP sensor I've seen/heard of.

The other one had the same connector, without the MAP sensor since it was also running MAF too.

~Mark