Motor Vehicle Maintenance & Repair Asked by Bitbang3r on July 5, 2021
I have a 2008 Sport Trac with a dying PCM whose symptoms overwhelmingly suggest that it has one or more bad electrolytic capacitors. It’s likely to be an easy repair… assuming I can figure out how to get the case opened without damaging it.
I "get" the general theme… use heat to soften the glue/sealant, then pry it apart… but the devil’s in the details… like, "the temperature that’s hot enough to soften it, without melting or warping the plastic connector shrouds". I need ideas for how to go about getting it opened up without damaging it.
Also… when I’m all done… what do I need to buy so I can re-seal it up the same way? It obviously won’t do me a lot of good to fix today’s problem, only to have it die "for real, and for good" 3-9 months from now due to moisture getting inside.
Rubber mallet and pry tools. Hammer the first one in at back corner and then just slowly pry them open going all the way around it. I have special pry tools I made but you can get it done with flat heads screwdrivers. I used to use heat but its only helps a little so not worth the extra effort and care needed for the hot case. The only detail you really need to be concerned about is to not damage your connectors or the pcb with your tools. I also advise you to only remove the cover and to not try and remove the pcb completely. Its sealed to the case (heat sink) with silicone adhesive and can damage easily when trying to remove. All the electrolytic caps are on the top side. The bottom side is mostly just logic stuff, mcu and flash.
To seal units when done I use permatex 81173. Its Oxime silicone. Neutral curing and not conductive so its safe for the electronics if it happens to spill out on them.
Not going to lie, If your thinking its leaking caps, I've never seen one on this style fomoco ecu and I repair ecu's every day. Mostly ford and chrysler group stuff.
What issue's are you having that make you think its bad capacitors?
Answered by narkeleptk on July 5, 2021
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