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This is a 90 Mustang 5.0. A Key on Engine off scan gives me the 11 pass code. But when I try the engine on scan, the engine immediately races to about 3500rpms and stays there until I release the scanner. Some times when I am driving the engine will do the same thing, then it will come down...

Okay, here is where I am. It starts--no problem. But it seems to want to die and idles lousy when it is still cold. and there is a strong sucking sound coming from the cold air intake. When it is thoroughly warm it idles and runs great. I checked the ECT, both for volts (4.67) and...

I redid pin 47 and tightened some other pins. It ran really good, but when I move the computer around at different angle it runs differently--good or bad. Would the angle of the computer make a difference? I do still get a code 11 KOEO.

I do have a further question. When I remove the red "cap" will the pins just fall out? I don't want to suddenly have all the wires and pins come out and then have to figure out where they all go.

Great advice and thank you for the link to the connector. Since I think I have isolated the wire culprit I will try to fix that one first. If that doesn't work then maybe a complete pin replacement is in order. Thanks. :)

Yes, and I believe that the culprit is the 46 ground pin and/or wire. Now, how to fix it. How can I change the pin--that is, where the wire enters? I figure I can cut the wire and solder in a new piece, but I don't know how to get it out of the pin.

I found a very interesting phenomena. When I move the computer around--thus the wires--, the engine runs differently--from really good to stalling. A visual of the wires and connections doesn't come up with anything. I did some continuity testing--43 and 29 pins to O2 sensors, the ETC and the...

I checked the ohms on the two wires--pins 43 and 29 at the computer and harness. They test at .3 max ohms. But when I checked the voltage while idling--grounding the meter to the body and clipping the other end to a safety pin stuck through wires at the two pin numbers (separately, of course)...

I did replace the 02 sensors. I also tested the old ones out of the car with torch process measuring the voltage change and they checked out okay. Would both go out at the same time? Also what would cause it to run bad then good?

It's great to have this comparison. I have both versions. Here is my question now. I am using the original Motorcraft TFI and have relocated it on the passenger side in a Cougar heat sink. I did a smoke test (several actually) and eliminated some major intake leaks in the front of the lower...

My question now is, does a leak coming from the distributor housing constitute a vacuum leak. And would it set of the 41 and 91 codes?

Okay, I took the car out today and it behaved as before. But from the get go it ran like crap. But then, after thoroughly warm, I turned the key off, as I was driving, and then restarted it, at which it ran fine. So what is up with that?

Code 21 comes up on a scan when the car is relatively cold, but when hot the code disappears. This seems go along with the car dying on start until warmed up a little. When hot the idle stabilizes. I have tried three different ECT sensors with no difference in outcome. Is it normal to have...

Wow--duh. The key does have to be on. Sorry for the waste of your time. The TPS is fine, but I still now have the question about the TFI. Would the TFI have similar driveability issues? Missing, idling rough, tach jumping around, etc.?

I did another test on the TPS. it had checked out fine some time ago, but now it is reading something crazy on the orange wire around 73 volts. On the green wire it starts at high voltage and increases as I open the throttle but way out of line. The black wire reads 1.9 oms, so that seems...

Now I am suspecting the TFI. The tach jumps up and down and misses like crazy esp on acceleration. I have a new Mallory dizzy and of course TFI. It's black if that means anything. But I also have replacement headers and suspect that the temperature get hotter than normal. I don't suppose it...

Yes, I did unplug the MAF and the car just dies.

Thanks for the input. I don't notice a difference when I disconnect the battery for even 20 minutes. But here is some interesting information that may apply to my car, especially the last paragraph: http://www.cleanmpg.com/forums/showthread.php?t=2463 Resetting Keep Alive Memory (KAM)...

Yes, you have been a great help with many of my issues. So once again, I ask on cold start, what effect do the 91/41 codes have, if any--the only two codes I have? Vacuum test passed. My car starts right up, but then idles really bad and then may shut off unless I give it some gas. When...

I do get a code 11 on koeo. Good question about the harness. When I bought the car (2001) it had had another engine with a Kenbell supercharcher and GT 40 heads. The engine was replaced when someone burned up the heads (not sure why they had to change the engine). So whether or not the...