Forum > It's all about the Turbo...
rich problem, the smell of defeat
Wittsend:
Congratulation on the fix. And, yes, Jerry (Old Kayker) has come to my rescue with great information too. Me, I've got the original LA-3 in the car - and two spares LA-3's in my desk drawer. :-)
oldkayaker:
Congratulation s on finding the finding the problem, amazing tenacity. I do not recall ever reading about a circuit board trace separating like yours did. Spare components including computers come in very handy when trouble shooting. Having refurbished the wiring harness, you have headed off some future problems. In addition to having a running car, you now have a more intimate knowledge of your car's inner workings (maybe more than desired).
It finally occurred to me what "smashed" connection meant. The normal term is "crimped" connection. When done right with quality lugs and crimper, the crimped connection is great. There have been some on line discussions on the merits of crimp versus solder for signal level connections (usually no conclusion reached).
65ShelbyClone:
What Ford did is or something like resistance welding. Here is an example, although Ford's production-level welds really do look ugly and smashed, especially after 30 years in a harness collecting dirt and tape goop.
http://www.assemblymag.com/articles/91832-the-splice-is-right
--- Quote from: 82expghost on April 30, 2016, 09:57:22 PM ---Update on my issue,....... FIXED!
Next step was take ecu apart and look at it for anything noticable that would cause issues, took me 10 minutes tracing lines when i saw a bubble in the gelcoat of the board, poked and prodded it and found that signal return was broken on the board. Not burnt in any way, allittle amazed, so my next step was to solder a wire from one point to another and see if that fixes the proble, note to anybody attempting this, use alot of resin, its old and hard to get to act like solder, but i got a 3/4 long wire soldered to it and put it in the car and tested it to see if i still had problems
FULL RANGE OF THROTTLE! woo fixed it!
--- End quote ---
Bravo! Most people would have stopped at the ECU plug and just gone searching for another computer.
I opened up an '85 PF2 Merkur computer I have and it looks like an old desk phone inside. The only thing it's missing is curvy traces from hand-laid masks. I think they started using surface-mount components on a single board in '86 or '87.
oldkayaker:
Thanks 65ShelbyClone for the article. I have not kept up with the times and never seen/noticed that type of splice. It looks like a more efficient production method and you do not have to worry about using a quality lug.
65ShelbyClone:
The only reason I even know what "resistance welding" is is because they do some where I work. Most of it involves welding mission-critical electrical contacts together.
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