1991 F150 4x2 EFI I6 156k

Get ready for the typical dumb newbie question. I Have just bought the code reader for my rig. I am not a mechanic but would like to learn more and do more to keep it going. I have located the STI connector but it seems housed in some kind of cover (on the drivers side just behind the air cleaner,it says EEC Test on it). It looks like there is a clip that I would push to get the test connector out of the housing. But I push on it and the test connector won't come out. I don't want to force it too much just in case I am mistaken and the clip is not meant for releasing the test connector. I have been able to get this clip pushed out past what looks like the thing that holds the test connector in place but still the test connector won't come out. Once I can get access to the test connector I should be fine. The question is do I get access to the test connector by pushing on that clip and pulling down on the wires. I don't want to mess things up.

 

There is a plug on the end of those wires, pull on the plug if you can. It is a little tricky to get out.

Let me know if you find anything you can do with your code reader that you could not do with the check engine light. There must be a difference but I do not know what it is.

 

Well I did it. I finally got the test connector out and ran the tests. I left out the timing check because I don't have a timing light yet. So I ran it as if the timing was within spec. Just as a dry run anyway. Under these circumstances the tests results were good.

As far as what else the equus Code reader can do it says it teasts the relays and solenoids. Also it says it does a cylinder balance test to see if all cylinders are operating equally. It also has a wiggle test that tests some circuits to see if they are operating properly.

Now I just need to get a timing light and learn how to do that.

 

I still have a timing light left over from the olden days when points and condensers were still used. I don't remember the last time I actually used it. ( or saw it ) If I were you I would borrow one or buy a used or really cheap one.

Did you get an instruction book with your scanner?

 

All of the things you listed the truck computer does during the test regardless of what method you use to pull the codes. You can't do a cylinder balance test on a batch fired engine, with our without a code reader.