• Register Today It's free! This box and some ads will disappear once registered!

PCM Memory Keep Alive Battery


shucker1

Elite Explorer
Joined
May 4, 2008
Messages
2,097
Reaction score
426
City, State
Metairie, Louisiana
Year, Model & Trim Level
98 XLT 5.0
Would anyone know how long the PCM Keep Alive Battery is designed to last?

Has anyone ever replaced one?
 


Join the Elite Explorers for $20 per year. Gets rid of the ads! New $5 per month "try out" option.

Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private Conversations, and more. Join Today. Your support is greatly appreciated.




410Fortune

River Season
Staff member
Moderator
Joined
August 3, 2000
Messages
26,359
Reaction score
2,027
City, State
NORTH IDAHO, 7B
Year, Model & Trim Level
B2 "Slightly" Modified
Callsign
FOURTEN
I don't think there is a battery in there
I have seen the inside of many PCM, never a battery
There is a circuit (wire) for the keep alive power, that wire just goes to the battery
 




shucker1

Elite Explorer
Joined
May 4, 2008
Messages
2,097
Reaction score
426
City, State
Metairie, Louisiana
Year, Model & Trim Level
98 XLT 5.0
Thought there might be a Coin Cell Keep alive battery.

Truck has been Out Of Service for quite a while (3 Years) while I slowly work on the full restoration.

Hopefully I have not "Blitzed" my PCM.

Doesn't really matter, it has to be fully re-tuned anyway after everything is done.
 




410Fortune

River Season
Staff member
Moderator
Joined
August 3, 2000
Messages
26,359
Reaction score
2,027
City, State
NORTH IDAHO, 7B
Year, Model & Trim Level
B2 "Slightly" Modified
Callsign
FOURTEN
These trucks don't usually mind sitting depending on how dry your climate is, when I drag home projects it can be 1-3 years before they come into the shop
You can pretty much plan on doing a fuel pump/ filter but the PCM and such usually hold up really well
I keep cats around to keep the mice away, unhook the battery, support them on blocks if I plan to save the tires, fill the fuel tank (less varnishing possible) and put a box of baking powder in the interior to suck up moisture. Then cover them or set them in the shade and work like heck to get them in the shop asap

I have had a few bad PCM's over the years. Usually some sort of voltage spike or moisture intrusion can lead to their demise. The 91-94 trucks are getting older and we have had to buy aftermarket/ reprogrammed pcm online a few times here and there. Those can be a crapshoot. Maybe 5 or 6 bad pcm in 20+ years of working on these trucks...they are pretty dang reliable!
 




shucker1

Elite Explorer
Joined
May 4, 2008
Messages
2,097
Reaction score
426
City, State
Metairie, Louisiana
Year, Model & Trim Level
98 XLT 5.0
You can pretty much plan on doing a fuel pump/ filter

That's a given anyway since I'm going to a 331 Stroker.

Tank coming out so the underside frame can get painted.

"No I'm not doing a Cobber" and cutting holes in my freakin truck...

Thanks.
 




Mbrooks420

High Voltage.
Elite Explorer
EF Vendor
Joined
February 2, 2002
Messages
9,976
Reaction score
1,407
Year, Model & Trim Level
1998 Mountaineer AWD
C’mon cut some big ass jagged holes in there, brah.
 




410Fortune

River Season
Staff member
Moderator
Joined
August 3, 2000
Messages
26,359
Reaction score
2,027
City, State
NORTH IDAHO, 7B
Year, Model & Trim Level
B2 "Slightly" Modified
Callsign
FOURTEN
I cut a fuel pump access panel in my BII....but that's way too easy....its just flat metal on top of the tank.
I love my old 88, it has everything you need and then some (except the 331 part, that is coming).
 




Mbrooks420

High Voltage.
Elite Explorer
EF Vendor
Joined
February 2, 2002
Messages
9,976
Reaction score
1,407
Year, Model & Trim Level
1998 Mountaineer AWD
If I ever have to drop my tank, I’ll cut an access then. It’ll look factory when I’m done though, and not be a terrible hack job where I forcibly rip the fuel line clips apart. :crazy:
 




shucker1

Elite Explorer
Joined
May 4, 2008
Messages
2,097
Reaction score
426
City, State
Metairie, Louisiana
Year, Model & Trim Level
98 XLT 5.0
It a long and tedious process for sure.

I just found all (4) Door Trims used but in one piece after a 2 year search.

Inside of the truck is full of new parts.

Frame is getting POR-15 section by section.

All engine accessory brackets and removable components that can be powder coated are getting slowly done.

Engine is done and on a stand waiting. Transmission is out and waiting it's turn to go to the builder.

I want MY case back since I am the original owner and I know the history of the truck.

After I'm done I'll probably be too afraid to drive it for fear of some clown running into it....
 




imp

Well-Known Member
Joined
November 12, 2009
Messages
4,568
Reaction score
547
Location
West-Central AZ along the Colorado River
Year, Model & Trim Level
59 Ranchero F250 D'Line
Would anyone know how long the PCM Keep Alive Battery is designed to last?

Has anyone ever replaced one?
@shucker1
It's a good thing, this question! Encouraged deeper response regarding the vehicle, status, work being done. I always knew 2 years of E-E would be a good thing for me! imp
 




Top