Re: Fuel Pressure Gauges, I have some!

["Lawson, Dave" <dlawson@ball.com>]

Hi Dennis,

>I tested the temp sender tonight, and am not sure of the result. The cold 
>reading was not even 900 ohms. The hot number was right at 100. As the
engine 
>warmed up, the ohms steadily dropped to the 100 figure. Grounding the temp 
>sender wire had no effect on the duty cycle readings. So even though the 
>sender cold reading was low, the elimination of the sender producing no 
>change tells me that the problem lies elsewhere. Maybe the O2 sender?

I assume that your ur-q still has the original engine and ECU installed. 
If so, way back, when my 1983 ur-q still had it's original MAC02 ECU,
I installed an Abt dash housing and some extra gauges, turbo boost,
oil pressure and water temp. After reviewing the ur-q documentation,
I noticed that a water temp sender was located on the head and thought
I could double up on the temp sender signal and use it for the coolant
temp gauge. After doing this, it turns out that the temp sensor signal 
to the ECU was grounding through the gauge which made the ECU 
think the engine was cold and it responded with a fixed duty cycle.
Once I disconnected the gauge, the varying duty cycle of a warm
engine at idle returned.

HTH.
-
Dave Lawson
1983 urquattro, lhasa green, MC engine, tweaks galore
1990 200 TQ Avant