Well electrolytic caps have a gel in them that dries out over time and it can leak out. It is probably corrosive too. Like the original post mentioned, you have to install an electrolytic cap one way. If the cap has a long line on one side like the one in the pic then that is the negative side. Sometimes they will have a + on them. The +, of course denotes the positive side. So just look at which way the cap is installed that you take out. Electrolytics will also have a max voltage stamped on them like 25V or 16V. Make sure you buy caps that have a max voltage at least as high as the ones you are pulling out. If you take out one that says 25V then you can put one back in that says 25V or higher. Just as an FYI, if you install and electrolytic backwards the metal cap on the top of it will blow off like a little light weight bullet when it is energized. Just a little fun with electronics 101.
Just had the same problem, and used this post to fix it. Everything worked great and fired up 1st try. I'm currently at school and don't have a solder gun so I prepped everything and brought it to a local computer/electronics repair shop and had a nice solder job done for $15. Only trouble I had was trying to pry the ECU out of the plastic casing itself without damaging it.
Thanks for the post!
4.0 caps are 22Uf and 32 volt. Radio Shack 1.29 each.
I will provide this information provided you do not let another soul know.
Be carefull with what kind of sealant is used to re-seal the caps/ solder points and the circuit board to the case. Make sure there is no water or water based solvent in it what so ever. "a guy I know" used caulk, didn't check that it was latex based. Bad for everything including solder, circuit boards and traces on them.
Everything is better now, "he" got real good at fixing circuit board traces.
Probably not. Disconnect it before putting the ecu back in.
The issue is when you have partial contact and you have arcing electricity that could go where it shouldn't. Usually you just get a light show but even with the battery connected most of the time installing an ecu you wont even realize that there is current around, it really is just a safety measure.