[T3] Bad day at the (FI) office

[Daniel Nohejl]

> On Mar 21, 2016, at 7:31 PM, Keith Park <topnotch at nycap.rr.com> wrote:
> 
> 1000 ohms in series with your head temp sensor will never let it think its
> warmed up, thats your problem.  Your head temps sensor MUST be BELOW 100
> ohms when the engine is hot.  Shunt resistors are the only thing you can do
> here.
> 
> Main mixture is adjusted with your pressure sensor or fuel pressure, as you
> did before.
> 
> Keith


Ooops….I used option-z on my Mac to make the ohm symbol and it came out funny. We’re using a 100 ohm resistor! It’s a ceramic one with wire on either end. It looks more or less like this:

http://g04.a.alicdn.com/kf/HTB101MJIFXXXXXvaXXXq6xXFXXX6/5-Pcs-Axial-Wirewound-Cement-font-b-Resistors-b-font-font-b-100-b-font-font.jpg <http://g04.a.alicdn.com/kf/HTB101MJIFXXXXXvaXXXq6xXFXXX6/5-Pcs-Axial-Wirewound-Cement-font-b-Resistors-b-font-font-b-100-b-font-font.jpg>

I’m fairly sure you can see it in one of the videos we posted last Monday. I put the resistor in because in short amounts of time (under 10 minutes), the resistance in my TS2 would drop to around 80 ohms which is quite low based on what I derived from the K-manual. The idle would hunt when fully warm. Once I put in the resistor, that stopped. Also, with help from Joe (the harness maker) and an equation he gave me to graph resistance values at various temps it seemed like 80 ohms was pretty low for only having driven 10 minutes in cold weather. Of course this stuff is all subject to interpretation in the absence of hard data from the manufacturer. 

Daniel.







> 
> 
> We've now got close to 50 miles on the new ECU and the issues of last week
> haven't returned. How about this though? Since installing this ECU, we seem
> to be running even richer (by the AFR gauge) and the fully warm idle sounds
> to be around 1100-1200 rpm. It doesn't seem to come down to what I
> previously had it set to. I can reset the idle to spec and see what happens,
> but I thought this was an interesting phenomenon. Plus, we still have to
> address the rich running. 15 mpg isn't good by any measure I'm aware of but
> what to do about that? I should perhaps add that we have a 100O resistor
> inline with TS2 at the head fi that matters.
> f you need more help, contact: gregm at vwtype3.org
> 
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