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My truck has had idling issues for a few years. The TPS and IAC have been replaced multiple times and seem to correct the issue even if it's just temporary. The last few days I haven't been able to get the truck to run right. It starts up just fine and once it goes into closed loop the idle is very erratic and it barely makes it down the road. So, last night I pulled the computer out and took a look at it. To me, it looks like a couple of the capacitors have fried or something. I'm pretty sure the circuit board isn't supposed to have brown crud on it and the thin clear coating isn't supposed to be coming off. What do you all think? Potential Issue?
I think Amazon has them, and I know Mouser Electronics does. Wish I had a time machine so I could go back when Radio Shack was still around.
...or Heathkit, ...or Olsen Electronics (another Radio Shack-type store)... or... My Old Man built his own Stereo from HH Scott kits back in the '50s and '60s when Stereos were new--- and our first color TV was a Heathkit, built in 1968...
There are several places that will repair them, SIA being one, and that’s not a recommendation. I just know some have used them.
One issue I ran into was asking them (SIA) to repalce all the caps regardless of condition. They said they can, but would not give a warranty on it. I have no idea why. I’m sure others will chime in where they have had theirs replaced. If you just have what is needed repaired, you get the full warranty, even with the/some old capacitors - ie, if the original capicitor was not leaking ar had an issue, they leave it. It made no sense what so ever…
I sent mine out, and a couple others, a few years ago to some place in Arizona, don’t remember the name. Same program, just bench checked it and sent it back saying it was ok - and it had an obvious leaking capacitor, but bench checked ok… ymmv.
Here's a diagram of the capacitors' locations. The arrows indicate the orientation of the negative legs of the capacitors, and the negative leg will be longer, or there will be a line on the side of the capacitor, to indicate the negative side.
My advice for those that think it's easier and quicker to just replace the ECU, my personal experience is that, yes, the unit was (probably) checked-out, yes, the unit has a warranty, but, NO, the capacitors had not been replaced, and the warranty was not honored when it failed early in the warranty period. Just fix what you have through a reputable provider, or do it yourself.
Here's a diagram of the capacitors' locations. The arrows indicate the orientation of the negative legs of the capacitors, and the negative leg will be longer, or there will be a line on the side of the capacitor, to indicate the negative side.
That’s a good video, I like the tooth pick idea. Thanks for posting that up.
Just wanted to say thank you to all for the help. Especially @soupbean for the videos. I replaced all three caps today and the old girl is back up and running much better. Thanks again!
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