Been reading about leaking capacitors so I thought I would take a look at mine. Before I remove the PCM/ECM I would like to have the caps to replace if leaking. What size do I need and where can I find them for a 93 f150 4.9 manual trans? Thanks

 

If you go to the trouble of removing the component (and the caps are 20+ years old) good plan would be to just shotgun all of them..

Reason being "leaking" is more of an electrical term, than what people think of. They quite often go bad without any visual bulging or actual electrolyte leakage, in fact that may be the exception?

The only way to test an electrolytic is at rated voltage, simply measuring uF with a typical capacitance checker won't do this, they are pretty much useless.

 

RadioShack?

Newark, DigiKey and Mouser will definitely have them.

Eddiec has made a few posts about replacing these Cap's.
I think they were 10µF and 47µF.

 

I recall there are 2 of the 10uf capacitors and 1 of the 47uf capacitors. That will vary depending on which ECU you have.

Anyway replace the capacitors with the same UF rating but use a higher voltage rating of 50V. The originals were at 16V and over time voltage spikes would execed the voltage rating of the caps, that damages them over time and hence problems "after warranty".....

I see this in all electronics(TV's, audio ect...) I call it "planned obsolescence"

Rat Shack should have those capacitors, but don't exepct much help with the "cell phone" sales people there.

 

35V = 272-1025 and 272-1027...

10µf 35V 20% Radial-lead Electrolytic Capacitor | RadioShack.com
47µf 35V 20% Radial-lead Electrolytic Capacitor | RadioShack.com

 

Yep those will work. Any thing better than the 16V that was installed.

Now off to Rat Shack to get some pref boards to make up my O2 sensor display....(hope they have some still)

 

I view it more as value engineering by bean counters. Let's see, if we save three cents for each unit manufactured, and we manufacture.... Well, you see where this is headed.

 

Thanks very much

 

Here are the Digi-Key numbers if you're interested.

Qty 2: P14411-ND (47uf)
Qty 1: P13467-ND (10uf)

I got enough to do 3 trucks and everything was just over $5 even after shipping. Not expensive stuff here.

 

I've allways wondered this myself... In know there are companies out there that you can send your PCM to and have them repaired. But if its just a simple capacitor swap, that's no big deal... Anyone done one here, or is there a how to?


Just wondering; if its simple enough, why not do it as preventative maintenance?

 

There are any number of threads.
It is '80's tech.
Not like SMD's...

 

Sure, can save a lot of headache. "Counterfeit" electrolytic capacitors caused a bunch of computer board failures a while back. Whoever stole the formula missed out on part of the recipe, and the capacitors were toast even before they left the warehouse.

Lots of household appliances use them, televisions for just one example. If the power supply is bad, nothing else much matters, troubleshooting is pointless.

Here's another source, mostly geared for computers but they might have some good deals or general info: http://www.badcaps.net

 

Here you go, Radio Shack numbers and all:

A9x ECM's (and same years ECM's) Failures Due to Age

Easy to do.

Bob

 

DigiKey is out of stock for these, and Radio Shack only sells toys or phones these days…

Mouser shows 3 results for EEU-EB1J100S:

https://www.mouser.com/Search/Refine...d=EEU-EB1J100S

Since the "S" is also out of stock, would either of the other two work in its place? From cursory look, seems the difference is "high temp" vs. "general purpose".

 

It looks like you have to buy a whole reel of the other two instead of individual caps.