Old PCM Amnesia?
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More Turbo
Joined: Dec 2003
Posts: 620
Likes: 5
From: Missouri - Lake of the Oz
Old PCM Amnesia?
I have a PCM (code HOG0) I am trying to use in a '94 F150. My question for anyone who is truly knowledgeable based on past experience is since the PCM has been out of any vehicle for just over 20 years is it possible its ROM has been lost? The text on oldfuelinjection.com states the ROM lasts 20 years so perhaps I will just need another PCM. Can anyone attest to a unit still be viable after being on the shelf for 20+ years? Thank you.
Logistics Pro
Joined: Aug 2014
Posts: 3,570
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Well, that goes against the whole point of ROM.
When power is lost ROM maintains is memory.
More than likely something else is wrong with the EEC.
not saying it hasn’t happened, anything is possible. The ROM in these devices can be erased by applying UV to the glass window.
i have about 10 EEC-IV, including HOG1 and they all work fine after sitting on the shelf.
the caps need to be replaced.
When power is lost ROM maintains is memory.
More than likely something else is wrong with the EEC.
not saying it hasn’t happened, anything is possible. The ROM in these devices can be erased by applying UV to the glass window.
i have about 10 EEC-IV, including HOG1 and they all work fine after sitting on the shelf.
the caps need to be replaced.
Hotshot
Joined: Jul 2020
Posts: 10,539
Likes: 2,664
From: Near Salt Lake City
Right, PCMs have no shelf life
But in Fords, the capacitors do leak electrolyte after about 20 years
Remember Y2K?
Some people actually wondered if their cars would start on January 1st 2000
Read only memory is permanently written code
But in Fords, the capacitors do leak electrolyte after about 20 years
Remember Y2K?
Some people actually wondered if their cars would start on January 1st 2000
Read only memory is permanently written code
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