[T3] Bad day at the (FI) office

[William J]

For what it's worth my HTC drops below 70 OHMs . I thought adding 250 ohm to 
it would cure the lean type un even idle but it didn't change a thing. All 
that seemed to help was un plugging the IAD temp sensor the one that fits in 
your 69 case at the top.

 That type does not read air intake temp , since it's in the case I can't 
say what it reads maybe since it's close to the AAR maybe it see's it's 
temp.

 I don't have any way to read AF mix so I have no idea where mine is and 
different MPS did help a lot running wise.

William
----- Original Message ----- 
From: "Daniel Nohejl" <d.nohejl at gmail.com>
To: <type3 at vwtype3.org>
Sent: Thursday, March 24, 2016 4:27 PM
Subject: Re: [T3] Bad day at the (FI) office


>I tried out two more brains (one A and one B) and they both behave exactly 
>like the one I reported on the other day (CUX10): with 100 ohms of 
>resistance at TS2, the motor seems stuck in warm up mode even though the 
>150-165 ohm range I saw over the last few days is already pretty low. With 
>the resistor removed, the idle is very lean and it hunts. Acceleration is 
>poor and very lean as well. Resistance at the sensor with the resistor 
>removed was 64 ohms when warmed up, which is the lowest I’ve seen it. 
>Interestingly, the resistance reading of the intake air temp sensor was 
>also 64 ohms. The K manual says the lowest should be 80 ohms so mine is off 
>by 20%. Does this matter? It’s also only about 45* out and while I’ve 
>driven around a fair amount this evening, I didn’t do any heavy pushing, 
>speeding, or long highway runs so I wonder why I’m seeing the lowest 
>readings I’ve seen of each sensor. Does anyone out there have any 
>resistance readings of their sensors when the engine is warm?
>
> If it matters, I left the B unit installed as it was marginally less lean 
> than the other two.
>
> I also verified that my AAR is more or less all the way closed. Pinching 
> off the hose between the AAR and IAD didn’t discernibly change the idle 
> speed or the idle AFR at all. I figure if it was hanging open, then 
> pinching it would have a significant effect on both idle speed and AFR as 
> I’ve observed in the past.
>
> So there’s no smoking gun and unless I change or adjust something my 
> options are to keep driving rich and burn through gas at a miserable 15mpg 
> or drive very lean and cook my heads. The question is what to change 
> first?
>
>
>
> Daniel
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