Still Intermittent no start
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Cross-Country
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Hey RLA, sounds like I'm pulling the computer and sending it back to them. It's actually cardone that is rebuilding it, so I'm going to talk to their tech department directly and explain the issue so they can look specifically for that.
Last question though...is there any possibility a failed TPS could cause any of this. If it has failed and is reading WOT, then it will not send fuel to the injectors, correct? Which is one thing that's happening.
I'm also curious if there could be a bad connection in the harness somewhere, because I went out yesterday and it fired up. Today it did not...very intermittent.
Last question though...is there any possibility a failed TPS could cause any of this. If it has failed and is reading WOT, then it will not send fuel to the injectors, correct? Which is one thing that's happening.
I'm also curious if there could be a bad connection in the harness somewhere, because I went out yesterday and it fired up. Today it did not...very intermittent.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
Last question though...is there any possibility a failed TPS could cause any of this. If it has failed and is reading WOT, then it will not send fuel to the injectors, correct? Which is one thing that's happening.
I'm also curious if there could be a bad connection in the harness somewhere, because I went out yesterday and it fired up. Today it did not...very intermittent.
I'm also curious if there could be a bad connection in the harness somewhere, because I went out yesterday and it fired up. Today it did not...very intermittent.
Yes it would prevent the injectors from triggering. There would also be a code displayed for the high TPS output in the KOEO tests. Easy enough to confirm the theory. Unplug the TPS.
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Cross-Country
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So now I have another quandary...when I got home yesterday and it was still warm outside, she fired right up. I tried again at 5:30 this morning and it was 34 degrees outside and it wouldn't start (did the same thing it always does). I just got home and it's warm outside and she fired up again...looking like it first like the cold...still sound like a computer issue? Or possibly a connection somewhere else?
Fleet Owner
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From: Easton,Ks
The crystal is heavy and has broken loose from the board before and has caused an intermittent running of the clock circuit.
So you might look closely at the solder joints of the crystal.
Bad crystals will do this also.
The crystal oscillator clock circuit, the crystal is Y1 in the circuit below and the silver component laying on it's side in Randy A's photo above :
/
So you might look closely at the solder joints of the crystal.
Bad crystals will do this also.
The crystal oscillator clock circuit, the crystal is Y1 in the circuit below and the silver component laying on it's side in Randy A's photo above :
/
Fleet Owner
Joined: Oct 2005
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From: Kentucky
You could try to source one from a real electronic part supply house with zero guarantee that will fix your issue. You mentioned Cardone previously. That's a four letter word in my garage.
Cut your losses and either send the PCM to a real repair house or source a remanufactured one from a different vendor.
Cut your losses and either send the PCM to a real repair house or source a remanufactured one from a different vendor.
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Cross-Country
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I was originally trying to buy a reman'd one (once I found out I couldn't get a new one). And Napa was the only place I could find that would send mine off to get it rebuilt, and I found out a couple days ago that they send it to cardone. And that's all I've been able to find. Recommendations on other companies to send it to? or where I can get a reman'd one that will work in my truck that is not cardone? I could google my little *** off, but if you already have experience with any, and trust them, that would be preferred.
Thank you!
Thank you!
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Fleet Owner
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From: Easton,Ks
I have bought crystals from a place that grinds them to the frequency you want but that was back in the CB days (1970's).
You can but I would think it be more of a bad solder joint around one of the legs of the crystal and the crystal is OK.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Specifically: Standard Motor Products EM556
I see you found the other thread with a repair link.
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Cross-Country
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https://www.ford-trucks.com/forums/1...l#post17093947
Specifically: Standard Motor Products EM556
I see you found the other thread with a repair link.
Specifically: Standard Motor Products EM556
I see you found the other thread with a repair link.
I've searched and searched for that and can't find any. Everywhere says they are out of stock. Next thought?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Yes that is correct but the big black square is the CPU and does a lot more things than just housing the oscillator.
It controls everything the EEC Computer does for the truck, in a way you could call the CPU the computer for the truck. Everything else on the board is just the interface between the CPU and the truck other than the one chip that has the tape over it and it contains the program the CPU runs on.
It controls everything the EEC Computer does for the truck, in a way you could call the CPU the computer for the truck. Everything else on the board is just the interface between the CPU and the truck other than the one chip that has the tape over it and it contains the program the CPU runs on.