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Wiring Question for 1985 F150 5.0 MFPI

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Old 11-05-2012, 07:37 PM
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Wiring Question for 1985 F150 5.0 MFPI

Anyone possibly have a wiring diagram that shows the value (ohms) of the resistor used in the 1985 5.0 F.I. engine wiring harness?
 
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Old 11-05-2012, 07:41 PM
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I thought we had one in a recent thread. I will look and see if I can find it. It was a scan of a Ford schematic. If I remember correctly, it wasn't used in the fuel injection system though(if we are talking about the same one).
 
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Old 11-05-2012, 07:50 PM
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Here's the original thread.
https://www.ford-trucks.com/forums/1...ont-prime.html

Here's the picture. Is this the resistor you are talking about?

http://img809.imageshack.us/img809/943/50ignition.jpg
 
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Old 11-05-2012, 07:57 PM
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Forgot I had them. It's showing two 22 k ohm. Have found a bad diode. Hoping that this will be the end of the mystery.
 
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Old 11-06-2012, 08:42 PM
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Do you have any suggestions as to what to look for on ECU problem?
Replaced ECU, truck started, idled, and drove fine for about 3 days. Did both static & dynamic code checks. Nothing, other than code 10 & 11. Then started becoming difficult to start. Ran rich during start-up but smoothed out after 30 seconds or so.
Starting to go back like it was when I first started working on it. Getting codes for 2 or more sensors (static only)
Recently pulled wiring harness to perform thorough check of all wires for shorts. The OBD system should pick up wiring problems but I'm going to check anyway. thought I had a bad diode, but it checks ok.
Any other ideas on what could knock a ECU out in a short time? Rich condition most likely caused by ECU holing injectors open.
 
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