[T3] I'm a little confused about the cylinder head temp sonsor

[Jim Adney]

I know that some people think it make sense to add series or parallel 
resistance to the temp sensors, but I've never done that and never 
seen the need. I wouldn't expect to see this change the idle speed, 
just the mixture. Yes, it would take a sniffer to see this, or you 
might see it on your gas mileage if you keep really careful records.

On 1 Aug 2016 at 12:11, William J wrote:

> . I've read VW had a 200 ohm resister in series to offer a richer mix . Then I read charts showing the temps and relative resistance . 
> 
>  Then I read the ECU does not see the TS2 below 300 ohms and it needs to get below 300 to show the engine is fully warmed up . Also read if it does down to 70 ohms it will take to long to richen until the head temp brings it back up . 
> 
>  I found the plastic cover on the TS2 was so black I could not see the terminals so I found a double clear one and then realized the terminals were only touching or held together by the fit of the plastic cover now I can see they are connected and tight .
> 
>  I know the ECU see's the sensor because if un plugged no start or un plugged running it will quit yet how do I know if the ECU see's the change and changes the mix ? 
> 
>  Say it's hot and I add 250 ohms and it runs the same at idle should I notice a change in running or is this something only a sniffer would see? I did try a 250 ohm resister and at idle everything seemed the same , I though it might make a change in RPM . 

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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