Check Engine Light

You can definately do that with this mustang. Under the hood on the driver's side should be a black connector behind the strut tower, probably clipped on somewhere there tight. The black piece actually holds two connectors inside, a black one w/abt 6 pins and a small gray one w/just one pin. I can't find my manual at the moment, but I believe it's the gray connector and a pin on the black one. If you hold it so the black connector has just 2 pins at the top, i believe it's the right one that you jumper to the gray. Anyway, u just watch the flashes from the engine light to get your codes, then look them up somewhere that explains it. Btw, if you have an Advance Auto Parts near you, hit that instead, they definately have a big ol code reader that can hook up to that style diagnostic, if they say they can't read it, it's probably because that person doesn't know how to use it...(I work there and I'm one of only like 3 or 4 people in my store that bothers to know how it works, it's a bigger process than OBD II). Anyway, check that out

Biffmeistro said:

or I pull into one that says they can't read such an old car. (A 93)

My old car (An 87 Corolla GTS) had a place under the hood where all you do is short a couple plugs and the light starts blinking the code.
Can I do that with this one? And where?

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Most of the people at BlottoZone can't walk and chew gum at the same time or tie their shoes. I've given up relying on them for anything and usually bring a printout with part numbers of what I want. Even then the site has screwed me before.

Yes, you can jump a connector under the hood and read codes from the flashing check engine light. However, I don't know if it's the same as a 5.0(like I used to have).

Here's a picture I found on my computer of the diagnostic port and jumper wire on the EFI Fox3.

Your ECU should also be able to give you stored codes that may not be currently throwing a CEL(check engine light), but that happened recently. You shouldn't have to wait for the CEL to come on to get the error code. I haven't had to code scan for quite a while, but I think the stored codes come up during a Key On Engine Off(KOEO) test.

Biffmeistro said:

Well... I just went out and did that procedure with the key in tho on position and the engine off, but I didn't get any blinking off the check engine light.

That is what you meant by KOEO, right?

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Yeah, key in the "on" position where it it would be for the engine to run, but engine off.

I'm fuzzy on the exact procedure like I said, but it's also possible that you get current codes and then stored codes afterward all in one test period. All I've ever had to scan codes for was a bad O2 sensor on my old 5.0.

Also, you don't need an analog voltmeter. A test light also works for this and the cheap ones are $3 or less.