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1985 Bronco 5.0L

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Old 06-15-2017, 06:55 PM
ClintonA ClintonA is offline
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1985 Bronco 5.0L

I am getting code 18c, the SPOUT connector grounded. The truck will not start. Brand new distributor and module. I am very right on the timing, I have taken enough distributors in and out on these Ford EFIs before.

All sensors in the motor were replaced. New timing chain and checked the crank and the cam are on the correct strokes. I checked the wires to the module on the distributor to the computer 100 times and nothing is wrong. Tried an alternate module and no difference. Used a jumper cable and temped grounds everywhere and no change.

The truck did not start, and had the same code before I did any of this work. How do I rid this problem?

Thank you for reading.

PS here's the picture of it, it needs to run again! It is my wife's and it needs to be running before her highschool reunion.



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Old 06-16-2017, 12:15 PM
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rla2005 rla2005 is offline
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Code 18 (CM) has two definitions: Loss of IDM input to processor/SPOUT circuit grounded.

Have you tried removing the SPOUT plug to see if you get spark? If it is a grounded SPOUT signal that may prevent the computer from triggering the ICM. With the SPOUT out the raw PIP signal from the distributor will trigger the Ignition Control Module (ICM).

If the problem is really "Loss of IDM input to processor" that will not keep the truck from starting. There is a 22k ohm resistor in line from coil to the computer to provide a feedback signal that the coil is triggering.
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Old 06-16-2017, 06:52 PM
ClintonA ClintonA is offline
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Thanks for the information. I was able to find a soldered splice that was grounding itself. My computer now reads okay yet the truck still does not start. I went through everything again with the timing- pulled all the wires, pulled out plug 1 and found compression stroke, re-stabbed the distributor in, went through the firing order again. Still nothing. When it is turning over I can hear the tail pipe giving out low putts every few turns like it is trying. I am like pulling my hair out over this lol.
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Old 06-16-2017, 10:07 PM
ClintonA ClintonA is offline
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Update, it still says code 18c after trying to start it. I opened the wiring harness and inspected all the wires and they are all in order.
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Old 06-17-2017, 03:04 PM
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Not saying this is your problem but I have had issues with part store parts right out of the box. Maybe you have a bad distributor or other sensor if you got the parts from a local chain store (I have had way too many issues with distributors from my local parts stores.)


Anyways, if it's not starting (computer stuff aside) that means it's either:

1. Not getting spark (or it's too weak)
2. Not getting fuel (or the fuel pressure it too low)
3. Not timed correctly
4. No compression

I probably wouldn't worry about #4 and it seems like you have #3 taken care of as well.

Have you tried and tested for spark? I'd first test for spark at the ignition coil (the wire going to the top of the distributor), then if that's good, I'd test for spark on the wires (near the spark plug. Make sure the spark is a nice fat blue spark too.

If you are getting spark at the end of the wires (near the plugs), then it's gotta be fuel or timing. Based on having some codes, I'd suspect a spark issue.
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Old 06-17-2017, 09:45 PM
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Agreed , the 3 basic things fuel, spark. compression ,i see you had removed the upper intake , When was the engine last running ,been sitting long ?I know you said you have had problems before any changes ????Good looking 85 ! TR
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Old 06-19-2017, 12:46 PM
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Quote:
Originally Posted by ClintonA View Post
Update, it still says code 18c after trying to start it.
Did you clear the CM codes after repairing the wiring?

They are called stored codes for a reason. I believe they will eventually clear themselves, 40? drive cycles...maybe 80. Much easier to clear the codes yourself.
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