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Discussion Starter #1
This could get a little long, and I will update it as I have time. The truck is a 2003 F250 2wd. 180k on the odo. All new fluids and filters. Studded. egr and cat delete. New injectors. New oil cooler. New batteries. Tuned using an X4. Running Looney Wild tune for studded trucks.
So, the other day I was heading to class when my truck just died on me out of nowhere. Nothing out of the ordinary was happening earlier, all my temps seemed fine, voltages were all good, and my FICM was a steady 47.5-48.5.
It died, I had a little bit of power to my electronics. But it would only click once when I turned the key. I had a friend help me tow it to a nearby parking lot, which happened to be an auto part store. I knew my batteries weren't great so I had them test them. Both were dead, so I went ahead and bought 2 new ones. Replaced them and still nothing. So I had it towed to the mechanic thinking it could be a starter or something simple(ish). Well, he couldn't diagnose it. No communication to any of the 3 ports. Immediately I was told that the tuner probably trashed my PCM. I'm not too savvy on this part of things so any input would be appreciated. I had been using the same tune for about 1-2 months with no issues, or anything out of the ordinary.
So if anyone has any input I would appreciate it! They told me I would most likely need to take it to Ford directly.
Also, has anyone heard of a tuner randomly killing a PCM???

Thanks for any help!
 

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Did you check the main fuses ?

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Discussion Starter #3
I have not. I would imagine the mechanic did, but you never know. I will check when I'm around it next
 

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Also to check starter there is a wire on passenger side you can disconnect and touch the + on the batt it should crank.

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Discussion Starter #5
Just asked them. They checked the main fuses and the starter. Nothing off there it sounds like
 

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I call BS on a healthy FICM deltas and dying batteries.
Something isn't jiving here.
You need to charge the batteries, put the truck back to stock tune, and base line the deltas including fuel pressure.
Once all that is done, read the thread below and tell us what is sounds like when cranking and what the deltas are.

Are you working on the truck or just relaying info? Because if you are paying someone you may want to find a better shop.

https://www.powerstroke.org/forum/6-0l-problems-forum/236534-no-start-issue-look-here.html
 

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Discussion Starter #7
I could be wrong. I just had the batteries tested after and they were both dead. And my FICM voltage had never dropped below 47.5 until then.
I'm very much an amateur with this stuff, so I'm welcome to learning.
Okay, I will work on putting it back to stock next time I'm around it.
Would changing the tune actually have it try to crank more you think?? At the moment it just clicks once on the initial key turn.

Just relaying info at the moment. They're just the local mechanic, not a diesel specialist or anything by any means. They tried the fuses and starter. Tried to connect their scanner but it wouldn't even read anything.

Thanks for the help so far
 

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I could be wrong. I just had the batteries tested after and they were both dead. And my FICM voltage had never dropped below 47.5 until then.

I'm very much an amateur with this stuff, so I'm welcome to learning.

Okay, I will work on putting it back to stock next time I'm around it.

Would changing the tune actually have it try to crank more you think?? At the moment it just clicks once on the initial key turn.



Just relaying info at the moment. They're just the local mechanic, not a diesel specialist or anything by any means. They tried the fuses and starter. Tried to connect their scanner but it wouldn't even read anything.



Thanks for the help so far
Omg get your truck out of there stat

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Would changing the tune actually have it try to crank more you think?? At the moment it just clicks once on the initial key turn.
No, but do not try to change the tune if the batteries are not charged.

If it just clicks then forget the tune, and focus on trouble shooting that so we can get it to crank.
That may be simple as loose terminals or jumping the solenoid on the fender to determine if the starter is bad/frozen.

For all we know the motor is locked up.

either way, I would not let jimbobs auto emporium wrench on it.
 

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Discussion Starter #10
Okay. I've been trying to figure out what all to test on the cranking side of things. Not sure where to start at the moment.

Yeah, beyond the fuses and starter they haven't touched it. I will be getting it back home soon, so they won't be doing anything more to it.
I'll look a little more at the starter myself.
Is there any decent explanation there might be as to why their scanners wouldn't even read anything??
 

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The scanners wont work if there is a low voltage situation.
Similarly the truck wont crank in a low voltage situation.
Also, the truck will cut off in a low voltage situation.

See the theme here?

We can help ya out with this but it will take some reading and understanding of each step.

Come on in @djmaguire and help the rookie out.
 

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...
Come on in @djmaguire and help the rookie out.
Okay, okay...

Powerstroke 6.0 fun fact... If a FICM loses communication with the PCM, good FICM voltages can show on a monitor while the actual FICM output is crap. So, your calling b.s. on the FICM numbers was insightful.

Getting a starter to turn isn't difficult.
  • Charge the damn batteries.
  • Pull the radiator shroud.
  • Loosen the serpentine belt with the 1/2 socket receiver.
  • Use the wire by the map sensor to crank.

If it doesn't crank, remove it and put 12V on it. One of two things will happen...

  1. If it doesn't spin, replace it with a 6.4 starter.
  2. If it does spin, replace it with a 6.4 starter.

My work here is done...
 

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Discussion Starter #14
Sorry for the delayed reply. Between finals and whatnot with school I have been quite busy. Thanks for the input djmaguire!

So, today I went to test some things and try what yall mentioned and figured I would just try to start it. And what do you know it started right up just fine. (Without me doing anything on it. Just literally walking out on turning the key). So now I'm kind of confused as to what to do next. Someone mentioned that it would be faulty wiring or something that wasn't getting a connection. So what're yalls thoughts on it???
I know I'm really novice here so I appreciate you guys bearing with me on this one.
Thanks!
 
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