Re: [T3] Low Power

["Jim Adney" <jadney@vwtype3.org>]

On 14 Mar 2011 at 0:00, Robert Rogers wrote:

> I have a «73 FI Squareback that appears down on power (when compared
> to my «67 Fastback).  I have done all of the normal tune-up
> adjustments: valves, points, timing, plugs fuel pressure set at 29lbs.
>  It starts and runs well. High and low RPM appear OK. I know that some
> adjustment has been made on the Pressure Sensor.  Could that be the
> pr?blem? 

Attempts to "adjust" the pressure sensor are almost always 
counterproductive. I can usually set them back to where they are 
supposed to be, but my record isn't 100%.

Things I would suggest would be to check the charging system 
regulating voltage. It should be 14.1-14.4 V, measured at the battery 
at medium rpm after a warmup drive. If it's below 13.5 V, replace the 
voltage regulator.

Also, check the distributor mech advance. To do this, grab the rotor 
and twist it CW. It should twist smoothly about 15 deg and snap back 
quickly under its internal spring force when you release it.

Finally, you may need to watch the fuel pressure while you're 
driving. If the filter or screen are clogged, the pressure may be 
fine in the driveway, but sag under load.

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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