[T3] Bad day at the (FI) office

Daniel Nohejl d.nohejl at gmail.com
Sat Mar 19 19:27:06 PDT 2016


I forgot to mention that we used the little piece of circuit board you sent us—I should link to a picture for anyone who hasn’t seen it though it isn’t possible just now. It’s an ingenious little thing and I’m not fully sure how you got it off the board that precisely. We tried every connector at the end of the harness. There was no smoking gun but we tightened several using some “precision tweezers”. #24 was the loosest of them all but it wasn’t really loose, just relatively so. 

I wonder what you think about Deoxit or Deoxit Gold. I noticed that there are “scuff” marks on the copper/gold ends of the brain circuit boards where they meet the harness. I imagine the ends could be cleaned up with a pencil eraser or similar, but I wonder also about cleaning and rehabilitating them with a Deoxit spray. 


> On Mar 19, 2016, at 9:51 PM, Jim Adney <jadney at VWType3.org> wrote:
> On 19 Mar 2016 at 17:32, Daniel Nohejl wrote:
>> So here´s a little update on our drivability situation!
>> We pulled into a gas station and installed an A/B brain from Jim¦..A/B
>> because itTMs not 100% clear what the CU10X on the Bosch rebuild sticker
>> means. For now, that seems to have cleared everything up as we put on
>> another 18 miles and had no bucking, hesitation, or dips in idle speed.
>> It drove and idled steadily. 
> That sounds promising, but I'm sure we all understand that you'll 
> want quite a bit more experience with this before you're sure you 
> have a solution. While you were exchanging brains, did you check the 
> edge connector tightness with the little piece of PC board I sent 
> you? A loose connection there would also explain how your problems 
> seem to come and go, and how they often seem to get "fixed" by a 
> change of brains.
>> I wonder if the process of failing and the ultimate failure of the
>> ground connection for the brain caused something else to fail within
>> the brain? I have no idea how they work so I won´t embarrass myself by
>> trying to theorize about what may have happened. 
> Without the main ground, the only grounds to the system are via the 
> low impedances of the injectors and the cyl head temp sensor. I've 
> looked at the schematic and my impression is that this would either 
> cause permanent damage or no damage but not intermittent failure.
> Hang onto the extra brains you have there until you're satisfied with 
> at least one of them. Eventually, I'd like you to test each of them 
> and mark them with your results, so I have a better idea of what I'm 
> getting back.
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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