Yes, that's making more sense. The 10 is a separator, but 11 is a passing grade.

I think I have the official Ford procedures up on a hosting site someplace, I'll see if I can find 'em and display 'em here. If you can read 'em, what the reder is telling you will make more sense.

But, bedtime for Bonzo right now, Niterz!

 

Thank you sir.

 

OK, the Ford docs are in a PhotoBucket Album here:

http://s1266.photobucket.com/user/ct...20Quick%20Test

There is sometimes a + in the lower-RH corner of each image to zoom in (once you're looking at a somewhat-large version) if desired, pressing it multiple times gives full-size images.

They're 25 pages, what I was mostly wondering is why you get a !0 (separator) as the first code but I'm not going to worry about it; if it were me, I would do the manual blinkenlight method to verify things as I don't really want to trust these el cheapo readers much but that's just me.

Page 20 explains the pauses between code displays, perhaps the first fast-output is being interpreted as a separator pulse, who knows.....

Anyhow... 87 in KOEO, it thinks the fuel pump isn't getting the right power at the right times.

63 in KOEO is the TPS, this is the primary method the computer uses to determine how much gas you're giving it , and it uses that information to control engine operation (for example, on some applications, it varies fuel pressure accordingly).

First thing I would do is a KOER test and see what comes up; if that also points at the TPS, I'd then disconnect the battery, swap in a known-good component, reconnect the battery, and begin again.

Let me know if the photobucket link doesn't work for you....

 

Here is a copy of the DTC from Chilton

https://drive.google.com/file/d/0BzI...it?usp=sharing


https://drive.google.com/file/d/0BzI...it?usp=sharing

 

So I replaced the throttle position sensor and it took me 30 minutes to adjust the voltage on it to 1V. Now the truck runs right as rain, and dare I say, better than before! Shifts like a dream now too.

 

Glad you got it fixed.

But this is an example of why it's good to pull ALL codes, and one generally begins with the KOER variants. There is a distinct possibility your old fuel relay is fine and didn't need replacing....

 

Hey, Code 10 is "Cylinder #1 Failed Cylinder Balance Test."
2 Digit Code List

3 Digit Code List

 

You are correct, a Code 10 can be output during a Cylinder Balance Test (CBT) to indicate a problem with Cylinder #1.

But that wouldn't be a valid code here because the OP was doing a KOEO (Key On, Engine Off) test only... the Cylinder Balance Test is a wholly independent test performed within 2 minutes of DTCs of the KOER (Key On, Engine Running) test being delivered.

People who are used to modern cars (OBD-II) don't necessarily take the correct approach in diagnosing an OBD-I vehicle, which has three sets of codes to be delivered over the course of two tests (not including the CBT or Continuous Self Test), it's not like you just plug a reader into a port and the computer tells you exactly what's wrong... computer diagnostics hadn't evolved to that point yet and were somewhat awkward.

The attachments below are from the 1993 Ford Powertrain/Emissions Diagnosis Manual and describe the Cylinder Balance Test and possible resulting codes (I couldn't find this in the 1986 book and, besides, the 93 book has cleaner pages).